52671 + Interview Questions in Chemistry in Class 11

1.	Assertion : Oxalic acid is a dibasic acid Reason : It contains two basic radicals
Answer» Both ASSERTION and reason are correct and reason is the correct EXPLANATION for assertion . Both assertion and reason are correct but reason is not the correct explanation for assertion . Assertion is true but reason are FALSE. Both assertion and reason are false ANSWER :A::B

Discussion

2.	Assertion : Ortho boric acidcrystal are hard and cannot be broken eassilyinto the powder form. Reason :In the solid state B(OH)_(3) unitsare hydrogen bonded togather into twodimensional sheets.
Answer» If both assertion and reason are TRUE and the reason is the CORRECT explanationof the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If assertion is false but reason is true. Solution :In the solid state , the `Be(OH)_(3)` units are HYDROGEN bonded together into two dimensional sheet with almosthexagonal symmetry .The layered are QUITE a largedistanceapart `(3,18 Å)`and thus the crystal breks quite EASILY into into very first particles.

Discussion

3.	Assertion : Orbit and orbital are synonymous. Reason : A circular path around the nucleus in which an electron moves is called orbit or orbital.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :An orbit, as proposed by Bohr, is a circular path of fixed radius and energy around the nucleus in which an ELECTRON MOVES whereas, an atomic orbital is a quantum mechanical CONCEPT and is the region around the nucleus where probability of finding the electron is maximum.

Discussion

4.	Assertion. Only principal quantum number determines the energy of an electron in an orbital of Na atom. Reason. For one electron system, the expression of energy is quite different from that obtained in Bohr's theory.
Answer» If both ASSERTION and reason are TRUE, and reason is the true explanation of the arrertion If both assertion and reason are true, but reason is not the true explanation of the assertional If assertion is true, but reason is false If both assertion and reason are false Solution :Correct A. To find the energy of an electron in an orbital, both PRINCIPAL and azimuthal quantum numbers are required. Correct R. For one electron SYSTEM, the expression of energy is same as that obtained in Bohr's theory

Discussion

5.	Assertion : One mole of helium atoms should occupy 22.4 litres volume at STP Reason : Taking 31 pm as radius of helium atoms, if we pack together a mole of helium atoms, the mole of atoms should have a volume of 22.4 litre
Answer» Both A and R are true and R is the correct EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true Answer :C

Discussion

6.	Assertion: One mole of atoms consist of 6.022 xx 10^23 atoms. Reason: In ordinary chemical reactions, atoms areand are always present in discrete number.
Answer» If both Assertion and Reason are CORRECT and Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion. If Assertion is CORRECT but Reason is INCORRECT If Assertion is INCORRECT but Reason is CORRECT. Answer :B

Discussion

7.	Assertion. On mixing 500mL of 10^(-6) M Ca^(-6) M Ca^(2+)ion and 500 mL of 10^(-6) M F^(-1) ion, the precipitate of CaF_(2) will be obtained. K_(sp)(CaF_(2))=10^(-18). Reason. If K_(sp)is greater than ionic product, a precipitate will develop.
Answer» If both ASSERTION and REASON are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If aasertion is true, but reason is false. If both assertion and reason are false. Solution :Correct A. `CaF_(2) hArr Ca^(2+) + 2 F^(-)`, Ionic product `=((10^(-6))/(2))((10^(_6))/(2))^(2) = 1.25 xx 10^(-19)` which is less than `K_(sp)` . Hence, no precipitate will develop. Correct R. If ionic product is greater than `K_(sp)`, a precipitate will develop.

Discussion

8.	Assertion:On heating, a solid usually change to a liquid and the liquid on further heating change to the gaseous state. Reason : Arrangement of constituent particles is different in solid, liquid and gaseous state.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion If both assertion and reason are true but reason is not correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :On heating, the interparticle distance and freedom of movment of particles increased and interparticle force decrease. Hence, on heating SOLIDS CHANGES to LIQUIDS, where the particles are comparatively LESS close to each other and hence can move around. Liquids on futher heating changes to gaseous state, in which the particles are far apart as compared to solids or liquids and their movement in easy and fast.

Discussion

9.	Assertion. On cooling, the brown colour of nitrogen dioxide disappears. Reason. On cooling. NO_(2) undergoes dimerisation resulting in the pairing of odd electron of NO_(2).
Answer» If both ASSERTION and REASON are true, and is the CORRECT explanation of the assertion. If both assertion and reason are true, but reason is not the correct explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

10.	Assertion. On adding Zinc pieces to aqueous FeCl_(3) solution, colour changes from deep yellow to light greenReason. Aqueous FeCl_(3) is acidic and on adding zinc, nascent hydrogen is produced which reduces deep yellow FeCl_(3) solution to light green FeCl_(2) solution.
Answer» ANSWER :A

Discussion

11.	Assertion : Oils are purified by steam distillation. Reason : The compounds which decompose at their boiling points can be purified by steam distillation.
Answer» If both assertion and REASON are true, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false Solution :Correct assertion. Only ESSENTIAL oils are purified by steam distillation. Correct reason. COMPOUNDS which are volatile in steam and INSOLUBLE in water can be purified by steam distillation.

Discussion

12.	Assertion: Number of radial and angular nodes for 3pordital are 1,1 respectively.Reason: Number of radial and angular nodes depends only on principal quantum number.
Answer» both assertion and REASON are TRUE and reason is the correct explanation of assertion. both assertion and reason are true butreason is not THECORRECT explanation of assertion. assertion is true but reason is FALSE both assertion and reason are false ANSWER :A::B

Discussion

13.	Assertion: Number of radial and angular nodes for 3p orbital are 1, 1 respectively. Reason: Number of radial and angular nodes depends only on principal quantum number.
Answer» both assertion and REASON are true and reason is the correct explanation of assertion. both assertion and reason are true but reason is not the correct explanation of assertion. assertion is true but reason is false both assertion and reason are false Solution :No. of radial NODE = n-L-1 No. of angular node = l for 3p orbital No. of angular node = l=1 No. of radial node = n-l-1 =3-1-1 =1

Discussion

14.	Assertion : Number of orbitals in 3rd shell is 9.Reason : Number of orbitals for a particular value of n = n^2 .
Answer» If both ASSERTION & Reason are TRUE and the reason is the CORRECT explanation of the assertion. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. If Assertion is true STATEMENT but Reason is false. If both Assertion and Reason are false statements. Answer :A

Discussion

15.	Assertion : Number of radial and angular nodes for 3p orbitalare 1, 1 respectively. Reason: Number of radial and angular nodes depends only on principal quantum number.
Answer» both assertion and reason are TRUE and reason is the correct EXPLANATION of assertion both assertion and reason are true but reason is not the correct explanation of assertion. assertion is true but reason is FALSE both assertion and reason are false SOLUTION :Radial nodes is euqal to n - 1 - 1 and angular nodes is EQUAL to n - 1.

Discussion

16.	Assertion . NO_(3)^(-) is planer while NH_(3) is pyramidal . Reason. N in NO_(3)^(-) has sp^(2)and inNH_(3) has sp^(3) hybridizaton.
Answer» If both assertion and REASON are CORRECT, and reason is the correct EXPLANATION of the assertion. If both assertion and reason are correct , but reason is not the correct explanation of the assertion. If assertion is correct, but reason is INCORRECT . If both assertion and reason are incorrect. Answer :a

Discussion

17.	Assertion. No compound has both Schottky and Frenkel defects Reason. Both defects change the density of the solid
Answer» If both ASSERTION and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true , but reason is false If both assertion and reason are false. Solution :CORRECT A. Some compounds may have both Schottky and Frenkel DEFECTS (e.g., AgBr) Correct R. Schottky DEFECT lowers the DENSITY while Frenkel defect does not .

Discussion

18.	Assertion. Nitrogen is less reactive than molecular oxygen. Reason. The bond length of N_(2) is shorter than of oxygen.
Answer» If both ASSERTION and reason are true, and is the CORRECT explanation of the assertion. If both assertion and reason are true, but reason is not the correct explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct explanation. Because of the presence of a triple bond, bond DISSOCIATION energy of NITROGEN is much higher than that of OXYGEN.

Discussion

19.	Assertion . Nitrogen shown a valency of 3 as well as 5. Reason. Lewis symbol of nitrogen is :underset(.)overset(.) N*
Answer» If both assertion and reason are correct, and reason is the correct EXPLANATION of the assertion. If both assertion and reason are correct , but reason is not the correct explanation of the assertion. If assertion is correct, but reason is INCORRECT . If both assertion and reason are incorrect. Solution :R is the correct explanation of A .

Discussion

20.	Assertion. Nitrogen and oxygen are the main components in the atmosphere these do not react to form oxides of nitrogen. Reason. The reaction between nitrogen and oxygen requires high temperature.
Answer» If both assertion and REASON are TRUE, and is the CORRECT explanation of the assertion. If both assertion and reason are true, but reason is not the correct explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

21.	Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason : The reaction between nitrogen and oxygen requires high temperature.
Answer» Both ASSERTION and REASON are CORRECT, and the reason is the correct explanation for the assertion Both assertion and reason are correct, but the reason is not the correct explanation for the assertion The assertion is incorrect, but the reason is correct. Both the assertion and reason are incorrect. SOLUTION :Both assertion and reason are correct, and the reason is the correct explanation for the assertion.

Discussion

22.	Assertion: Nitroalkanes and alkyl nitrites exhibit funcctional isomerism. Reason: Compounds having same molecular formula but different functonal groups are called functional isomers.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

23.	Assertion: Nitration of benzene gives mainly m-nitrobenzene. Reason: In electrophilic nitration of benzene the nucleophile is NO_(2)^(+).
Answer» Assertion ANDREASON both are correct STATEMENTSAND reason iscorrect explanation for assertion. Assertion and reasonboth are correctstatementsbut reason is not correct explanation for assertion. Assertion is correct statementbut reasonwrong STATEMENT. Assertionis WRONG statement but reason is correctstatement. Answer :C

Discussion

24.	Assertion: Nitrate ores are very rare. Reason: Atmos in Greek means which cannot be subdivided.
Answer» Both A and R ar true and R is the correct EXPLANATION of A Both A and R are true but R is not a correct explanation ofA A is true but R is false A is false but R is true Solution :Both assertionA and reason R are true and R is not the correct explanation of A.

Discussion

25.	Assertion : NH_(2)=overset(S)overset(\|\|)(C)-NH_(2) gives red colour in Lassaigne's test. Reason : Compounds having N along with C give red colour in Lassaigne's test for nitrogen.
Answer» If both assertion and Reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false Solution :Correct reason. Compounds containing N, S and C GIVE COLOUR in LASSAIGNE's TEST.

Discussion

26.	Assertion. NF_(3) is a weak ligand than N(CH_(3))_(3). Reason. NF_(3) ionises to give F^(-) ion in aqueous solution.
Answer» If both assertion and reason are TRUE, and is the correct explanation of the assertion. If both assertion and reason are true, but reason is not the correct explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct reason. The lone pair of electrons on the N atom is strongly attracted by the THREE highly electronegatve F ATOMS. As a result, it is not available for DONATION and hence `NF_(3)` is a weak ligand.

Discussion

27.	Assertion : Neutrons are better projectiles. Reason : Neutrons move faster than protons or alpha particles.
Answer» Both A and R are TRUE and R is the correct explanation of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :C

Discussion

28.	Assertion : Neutrons are better prohectiles than protons or alpha-particles. Reason : The neutrons being neutral does not experience repulsions form positively charged nucleus.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

29.	Assertion. Nascent hydrogen can discharge the pink colour of KMnO_(4) solution. Reason. Nascent hydrogen is much more reactive than dihydrogen .
Answer» ANSWER :A

Discussion

30.	Assertion: Nascent hydrogen can discharged the pink colour of KMnO_(4) solution. Reason:Nascent hydrogen is much more reactive than ordinary hydrogen.
Answer» Solution :(c ) Correct reason. Nascent hydrogen can CAUSE the REDUCTION to `KMnO_(4)("PINK")` to `MnSO_(4)` (colourless).

Discussion

31.	Assertion. NaCl is precipitated when HCl gas is passed in a saturated solution of NaCl. Reason. HCl is a strong acid.
Answer» If both ASSERTION and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If aasertion is true, but reason is false. If both assertion and reason are false. Solution :CORRECT explanation. `NACL hArr Na^(+) + Cl^(-)`. On PASSING HCl, `Cl^(-)` ION concentration increases. Equilibrium shifts backward.

Discussion

32.	Assertion. NaCl is less soluble in heavy water than in ordinary water. Reason. Dielevtric constant of ordinary water is more than that of heavy water.
Answer» ANSWER :A

Discussion

33.	Assertion : Na_2SO_4 is soluble in water but BaSO_4 is insoluble Reason: Lattice energy of barium sulphate exceeds its hydration energy.
Answer» both ASSERTION and REASON are true and reason is the CORRECT explanation of assertion both assertion and reason are true but reason is not the correct explanation of assertion assertion is true but reason is false both assertion and reason are false Answer :A

Discussion

34.	Assertion . Na_(2)SO_(4) is soluble in water while BaSO_(4) is insoluble . Reason. Lattice energy of barium sulphate exceeds its hydration energy .
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false. Answer :a

Discussion

35.	Assertion .N_(3)^(-) is a weakar base thanNH_(2)^(-) . ltbr. Reason . The lone pair of electrons on N atom in N_(3)^(-) is in the sp^(2)-orbital while in NH_(2)^(-), it is in ansp^(3)- orbital.
Answer» If both assertion and reason are correct, and reason is the correct EXPLANATION of the assertion. If both assertion and reason are correct , but reason is not the correct explanation of the assertion. If assertion is correct, but reason is incorrect . If both assertion and reason are incorrect. SOLUTION :Basic STRENGTH depends upon the availability of lone pairs of electrons and lone pair of electrons is more EASILY available in `NH_(2)^(-) ` than in ` N_(3)^(-)` as it is present in `sp^(3)` in `NH_(2)^(-) and sp^(2) ` in `N_(3)^(-)` . HENCE , R is the correct explanation of A.

Discussion

36.	Assertion : N_(2) is less reactive than P_(4). Reason : Nitrogen has more electron gain enthalpy than phosphorus.
Answer» Both ASSERTION and REASON are correct statements, and reason is the correct EXPLANATION of the assertion. Both assertion is and reason are correct statements, but reason is not the correct explanation of the assertion. Assertion is correct, but reason is wrong statement. Assertion is wrong but reason is correct statement. Solution :Correct reason. P-P single bond in `P_(4)` molecules is much weaker `(213kJmol^(-1))` than `N-=N` triple bond `(941.2 kJ mol^(-1))` in `N_(2)`

Discussion

37.	Assertion: Most of the compounds of p-block elements are covalent. Reason: p-block elements, in general, have high electron affinities.
Answer» Both A and B true and R is the CORRECT EXPLANATION A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :B

Discussion

38.	Assertion . Molecular nitrogen is less reactive than molecular oxygen. Reason. The bond lengthof N_(2) is shorter than that of oxygen .
Answer» If both ASSERTION and reason are correct, and reason is the correct explanation of the assertion. If both assertion and reason are correct , but reason is not the correct explanation of the assertion. If assertion is correct, but reason is INCORRECT . If both assertion and reason are incorrect. SOLUTION :Ris the correct explanation of A .

Discussion

39.	Assertion: Molecular formula shows the exact number of different types of atoms present in a molecule of a compound. Reason : Molecular formula can be obtained directly from empirical formula which represents the simplest whole number ratio of various atoms present in a compound.
Answer» If both ASSERTION and REASON are true and reason is the correct explanation of assertion If both assertion and reason are true but reason is not correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :Molecular FORMULA can be OBTAINED from empirical formula is molar mass is known. Molecular formula = n X Empirical formula where, `n=("Molar mass")/("Empirical formula mass")`

Discussion

40.	Assertion : Molar volume of an ideal gas at 273 . 15 K and 1 bar is 22.4 L.Reason : Volume of a gas is inversely proportional to temperature .
Answer» If both assertion and REASON are true and reason is the correct explanation of assertion . If both assertion and reason are true but reason is notthe correct explanation of assertion . If assertion is true but reason is false . If both assertion and reason are false . Solution :Molar volume of an ideal gas at 273.15 K and 1 atm is 22.4 L whereas molar volume of an ideal gas at 273.15 K and 1 bar is 22.7 L. Also, the volume of a FIXED mass of a gas is DIRECTLY proportional to its absolute temperature at CONSTANT pressure.

Discussion

41.	Assertion.Molar entropy of vaporisation of water is different from ethanol. Reason. Water is more solar than ethanol.
Answer» If both A and R are true,andR is the TRUEEXPLANATION of A. If both A and R are true,but R is not the true EXPLANATION of A. If A is true, but R is false If both A and R are false. Answer :C

Discussion

42.	Assertion . Mg is not present in enamel of human teeth . Reason . Mg is an essential element for biological functions of human .
Answer» If both assertion and reason are TRUE, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false. Solution :CORRECT explanation . HUMAN TEETH is made up of hydroxyapatite , `Ca_(5)(PO_(4))_(3)OH` with enamel made up of fluoropatite , `3Ca_(3)(PO_(4))_(2). CaF_(2)`.

Discussion

43.	Assertion: Mixture of carbon tetrachloride and chloroform show positive deviationRaoult's law.Reason: In the mixture, the inter molecular force of attraction between chloroform and carbon tetrachloride is weaker than those betweenolecules of carbon tetrachloride and chloroform molecules
Answer» Both ASSERTION and REASON are CORRECT and reason is the correct EXPLANATION of assertion. Both assertion and reason are correct and reason is not the correct explanation for assertion. Both assertion and reason are false. Assertion is TRUE, but reason is false. Solution :Both assertion and reason are correct and reason is the correct explanation of assertion.

Discussion

44.	Assertion: Metallic character increases from left to right among the elements of 2nd period. Reason: Second period is called shortest period.
Answer» Both A and B true and R is the correct EXPLANATION A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE Both A and R are false Answer :D

Discussion

45.	Assertion : Methanoic acid reduces mercuric chloride to mercurous chloride on heating while ethanoic acid does not Reason : Methanoic acid is a stronger acid than ethanoic acid
Answer» Both A and R are TRUE is the correct EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is FALSE A is false but R is true Answer :B

Discussion

46.	Assertion. Menscus of a liquid disappears at critical temperature. Reason. Density of a liquidand its gaseous phase become equal at the critical temperature.
Answer» SOLUTION :R is the correct explanation of A. At the critical point, various PHYSICAL propertiies such as density, refractive INDEX etc. have identicalvalue for the liquid and the gaseous state.

Discussion

47.	Assertion. Melting point of neopentane is higher than that of n- pentane but the boiling point of n-pentane is higher than that of neopentane. Reason. Melting point depends upon packing of molecules in the crystal lattice while boiling point depends upon surface area of the molecule
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

48.	Assertion : Melting and boiling points of D_(2)O are higher than those of ordinary H_(2)O. Reason : D_(2)O has lesser degree of association and lower molecular mass than H_(2)O.
Answer» If both assertion and reason are true and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :`D_(2)O` has higher molecular mass and greater DEGREE of association than `H_(2)O` and thus, has higher MELTING and BOILING POINTS.

Discussion

49.	Assertion:Matter can neither be created nor be destroyed. Reason : This is law of definite proportions.
Answer» If both ASSERTION and REASON are true and reason is the CORRECT explanation of assertion If both assertion and reason are true but reason is not correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :Law of conservation of mass STATE that MATTER can neither be created nor destroyed.

Discussion

50.	Assertion. Many endothermic reactions which are non-spontaneous ifDeltaSis positive and T DeltaSgt DeltaH. Reason. Endothermic reactions become spontaneous if DeltaS is positvie andT DeltaS gt DeltaH.
Answer» If both A and R are TRUE,ANDR is the TRUEEXPLANATION of A. If both A and R are true,but R is not the true explanation of A. If A is true, but R is false If both A and R are false. Answer :a

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Oxalic acid is a dibasic acid Reason : It contains two basic radicals

Assertion : Ortho boric acidcrystal are hard and cannot be broken eassilyinto the powder form. Reason :In the solid state B(OH)_(3) unitsare hydrogen bonded togather into twodimensional sheets.

Assertion : Orbit and orbital are synonymous. Reason : A circular path around the nucleus in which an electron moves is called orbit or orbital.

Assertion. Only principal quantum number determines the energy of an electron in an orbital of Na atom. Reason. For one electron system, the expression of energy is quite different from that obtained in Bohr's theory.

Assertion : One mole of helium atoms should occupy 22.4 litres volume at STP Reason : Taking 31 pm as radius of helium atoms, if we pack together a mole of helium atoms, the mole of atoms should have a volume of 22.4 litre

Assertion: One mole of atoms consist of 6.022 xx 10^23 atoms. Reason: In ordinary chemical reactions, atoms areand are always present in discrete number.

Assertion. On mixing 500mL of 10^(-6) M Ca^(-6) M Ca^(2+)ion and 500 mL of 10^(-6) M F^(-1) ion, the precipitate of CaF_(2) will be obtained. K_(sp)(CaF_(2))=10^(-18). Reason. If K_(sp)is greater than ionic product, a precipitate will develop.

Assertion:On heating, a solid usually change to a liquid and the liquid on further heating change to the gaseous state. Reason : Arrangement of constituent particles is different in solid, liquid and gaseous state.

Assertion. On cooling, the brown colour of nitrogen dioxide disappears. Reason. On cooling. NO_(2) undergoes dimerisation resulting in the pairing of odd electron of NO_(2).

Assertion. On adding Zinc pieces to aqueous FeCl_(3) solution, colour changes from deep yellow to light greenReason. Aqueous FeCl_(3) is acidic and on adding zinc, nascent hydrogen is produced which reduces deep yellow FeCl_(3) solution to light green FeCl_(2) solution.

Assertion : Oils are purified by steam distillation. Reason : The compounds which decompose at their boiling points can be purified by steam distillation.

Assertion: Number of radial and angular nodes for 3pordital are 1,1 respectively.Reason: Number of radial and angular nodes depends only on principal quantum number.

Assertion: Number of radial and angular nodes for 3p orbital are 1, 1 respectively. Reason: Number of radial and angular nodes depends only on principal quantum number.

Assertion : Number of orbitals in 3rd shell is 9.Reason : Number of orbitals for a particular value of n = n^2 .

Assertion : Number of radial and angular nodes for 3p orbitalare 1, 1 respectively. Reason: Number of radial and angular nodes depends only on principal quantum number.

Assertion . NO_(3)^(-) is planer while NH_(3) is pyramidal . Reason. N in NO_(3)^(-) has sp^(2)and inNH_(3) has sp^(3) hybridizaton.

Assertion. No compound has both Schottky and Frenkel defects Reason. Both defects change the density of the solid

Assertion. Nitrogen is less reactive than molecular oxygen. Reason. The bond length of N_(2) is shorter than of oxygen.

Assertion . Nitrogen shown a valency of 3 as well as 5. Reason. Lewis symbol of nitrogen is :underset(.)overset(.) N*

Assertion. Nitrogen and oxygen are the main components in the atmosphere these do not react to form oxides of nitrogen. Reason. The reaction between nitrogen and oxygen requires high temperature.

Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason : The reaction between nitrogen and oxygen requires high temperature.

Assertion: Nitroalkanes and alkyl nitrites exhibit funcctional isomerism. Reason: Compounds having same molecular formula but different functonal groups are called functional isomers.

Assertion: Nitration of benzene gives mainly m-nitrobenzene. Reason: In electrophilic nitration of benzene the nucleophile is NO_(2)^(+).

Assertion: Nitrate ores are very rare. Reason: Atmos in Greek means which cannot be subdivided.

Assertion : NH_(2)=overset(S)overset(||)(C)-NH_(2) gives red colour in Lassaigne's test. Reason : Compounds having N along with C give red colour in Lassaigne's test for nitrogen.

Assertion. NF_(3) is a weak ligand than N(CH_(3))_(3). Reason. NF_(3) ionises to give F^(-) ion in aqueous solution.

Assertion : Neutrons are better projectiles. Reason : Neutrons move faster than protons or alpha particles.

Assertion : Neutrons are better prohectiles than protons or alpha-particles. Reason : The neutrons being neutral does not experience repulsions form positively charged nucleus.

Assertion. Nascent hydrogen can discharge the pink colour of KMnO_(4) solution. Reason. Nascent hydrogen is much more reactive than dihydrogen .

Assertion: Nascent hydrogen can discharged the pink colour of KMnO_(4) solution. Reason:Nascent hydrogen is much more reactive than ordinary hydrogen.

Assertion. NaCl is precipitated when HCl gas is passed in a saturated solution of NaCl. Reason. HCl is a strong acid.

Assertion. NaCl is less soluble in heavy water than in ordinary water. Reason. Dielevtric constant of ordinary water is more than that of heavy water.

Assertion : Na_2SO_4 is soluble in water but BaSO_4 is insoluble Reason: Lattice energy of barium sulphate exceeds its hydration energy.

Assertion . Na_(2)SO_(4) is soluble in water while BaSO_(4) is insoluble . Reason. Lattice energy of barium sulphate exceeds its hydration energy .

Assertion .N_(3)^(-) is a weakar base thanNH_(2)^(-) . ltbr. Reason . The lone pair of electrons on N atom in N_(3)^(-) is in the sp^(2)-orbital while in NH_(2)^(-), it is in ansp^(3)- orbital.

Assertion : N_(2) is less reactive than P_(4). Reason : Nitrogen has more electron gain enthalpy than phosphorus.

Assertion: Most of the compounds of p-block elements are covalent. Reason: p-block elements, in general, have high electron affinities.

Assertion . Molecular nitrogen is less reactive than molecular oxygen. Reason. The bond lengthof N_(2) is shorter than that of oxygen .

Assertion: Molecular formula shows the exact number of different types of atoms present in a molecule of a compound. Reason : Molecular formula can be obtained directly from empirical formula which represents the simplest whole number ratio of various atoms present in a compound.

Assertion : Molar volume of an ideal gas at 273 . 15 K and 1 bar is 22.4 L.Reason : Volume of a gas is inversely proportional to temperature .

Assertion.Molar entropy of vaporisation of water is different from ethanol. Reason. Water is more solar than ethanol.

Assertion . Mg is not present in enamel of human teeth . Reason . Mg is an essential element for biological functions of human .

Assertion: Mixture of carbon tetrachloride and chloroform show positive deviationRaoult's law.Reason: In the mixture, the inter molecular force of attraction between chloroform and carbon tetrachloride is weaker than those betweenolecules of carbon tetrachloride and chloroform molecules

Assertion: Metallic character increases from left to right among the elements of 2nd period. Reason: Second period is called shortest period.

Assertion : Methanoic acid reduces mercuric chloride to mercurous chloride on heating while ethanoic acid does not Reason : Methanoic acid is a stronger acid than ethanoic acid

Assertion. Menscus of a liquid disappears at critical temperature. Reason. Density of a liquidand its gaseous phase become equal at the critical temperature.

Assertion. Melting point of neopentane is higher than that of n- pentane but the boiling point of n-pentane is higher than that of neopentane. Reason. Melting point depends upon packing of molecules in the crystal lattice while boiling point depends upon surface area of the molecule

Assertion : Melting and boiling points of D_(2)O are higher than those of ordinary H_(2)O. Reason : D_(2)O has lesser degree of association and lower molecular mass than H_(2)O.

Assertion:Matter can neither be created nor be destroyed. Reason : This is law of definite proportions.

Assertion. Many endothermic reactions which are non-spontaneous ifDeltaSis positive and T DeltaSgt DeltaH. Reason. Endothermic reactions become spontaneous if DeltaS is positvie andT DeltaS gt DeltaH.