94420 + Interview Questions in Chemistry in Class 12 Page 1736 InterviewSolution

86751.	(A) The reduction of leached copper ore will be advisablewith Ironscrapthan zinc scrap (R) Zinc is more costlierthan Iron
Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct EXPLANATIONOF (A) (A) is true but (R) is false Both (A) and (R) are false Answer :A

Discussion

86752.	(A) The rections 2NO+O_(2) to 2NO_(2) and 2CO+O_(2) to 2CO_(2), proceed at the same rate because they are similar. (R ) Both the oxidations of NO and CO have the same activation energy.
Answer» Both (A) and (R ) are true and (R ) is the CORRECT explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :D

Discussion

86753.	(A) The reactions taking place in the sun are nuclear fusion reactions. (R ) The main reason for nuclear fusion reaction in the sun is that H_(2) is present in the sun's atomosphere so that hydrogen nuclei can fuse to form helium.
Answer» If both (A) and (R ) are CORRECT and (R ) is the correct EXPLANATION for (A). If both (A) and (R ) are correct but (R ) is not the correct explanation for (A ) If both (A) and (R ) are incorrect. If both (A) and (R ) are incorrect. Answer :C

Discussion

86754.	(A) The rate of the reaction is the rate of change of concentration of a reactant or a product. (R ) Rate of reaction remains constant during the complete reaction.
Answer» Both (A) and (R ) are true and (R ) is the CORRECT EXPLANATION of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :C

Discussion

86755.	A : The rate of sulphonation of benzene and deutrobenzene is different in the presence of oleum. R : The slow step is the breaking of C-H or C-D bond.
Answer» If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1). If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2) if Assertion is true statement but Reason is false, then mark (3) If both Assertion and Reason are false statements, then mark (4) Answer :1

Discussion

86756.	(A) The rate of reaction is always negative. (R ) Minus sign used in expressing the rate shows that concentration of product is decreasing
Answer» Both (A) and (R ) are TRUE and (R ) is the correct EXPLANATION of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :D

Discussion

86757.	(a) The rate of reaction increases in presence of catalyst. Explain the statement by plotting a curve between reaction coordinate and energy. (b) For a reaction, the initial concentration of reactant is 0.4 M and rate constant is 2.5xx10^(-4)"mol L"^(-1)s^(-1). Calculate the half-life period of the reaction.
Answer» SOLUTION :`[(b)" Units of k show that reaction is of zero order "t_(1//2)=([A]_(0))/(2K)=(0.4)/(2xx2.5xx10^(-4))s=1800s]`

Discussion

86758.	a) The rate of a particular reaction doubles when the temperature changes from 300 K to 310 K. Calculate the energy of activation of the reaction. [Given : R="8.314 JK"^(-1)" mol"^(-1)].
Answer» Solution :a) `log""(k_(2))/(k_(1))=(E_(a))/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]` `log""(2k_(1))/(k_(1))=(E_(a))/(2.303xx8.314)[(300-310)/(300xx310)]` `log2=(E_(a))/(19.1471)[(10)/(93000)]` `E_(a)=53598J or 53.598kJ`

Discussion

86759.	(A) : The rate of a chemical reaction decreases as the reaction proceeds. (R) : The reactant concentration remains constant as the reaction proceeds. The correct answer is
Answer» Both (A) and (R) are TRUE, (R) explains proprly (A) Both (A) and (R) are true, (R) does not EXPLAIN (A) (A) is true (R) is FALSE. (A) is false (R) is true. Answer :B

Discussion

86760.	(A) The rate law of a reaction cannot be predicted from its balanced chemical equation, but must be determined experimentally only. (R ) The order of a reaction is always an integer like, 0,1,2 and 3.
Answer» Both (A) and (R ) are TRUE and (R ) is the correct EXPLANATION of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :C

Discussion

86761.	(A) The rate law equation can be found only by experiment. (R ) Rate equations can be written from stoichiometric equation.
Answer» Both (A) and (R ) are TRUE and (R ) is the correct explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :C

Discussion

86762.	(A) The pyrimidine base thymine is present in RNA. (R) DNA controls the synthesis of proteins
Answer» Both A & R are TRUE, R is the correct explanation of A Both A & R are true, R is not correct explanation of A A is true, R is false A is false, R is true Answer :D

Discussion

86763.	(A) The purple colour of KMnO_4 is due to the charge transfer transition (R) The intense colour in most of the transition metal complexes is due to d-d transition
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution :Both (A) and (R) are true and (R) is not the correct explanation of (A)

Discussion

86764.	(A): The preservation of meat by salting and of fruits by adding sugar protects against bacterial action (R): Due to osmosis a bacterium on salted meat (or) candid fruit loose water shrivels and dies
Answer» Both (A) and (R) are TRUE and (R) is the correct explanation of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE (A) is false but (R) is true ANSWER :A

Discussion

86765.	(A) The presence of nitro group facilitates nucleophilic (R) The intermediate carbanion is stabilized due to the
Answer» If both A and R are CORRECT and R is the correct EXPLANATION of A. If both A and R are correct and R is not the correct explanation of A. If A is the correct but R is incorect. If A is the INCORRECT but R is corect. Answer :A

Discussion

86766.	(A) The pK_(a) value of acetic acid is lower than that of phenol. ( R) Phenoxide ion is more resonance stabilized.
Answer» If both (A) and (R) are CORRECT and (R) is the correct EXPLANATION of (A). If both (A) and (R) are correct but (R) is not correct explanation of (A). If (A) is correct but (R) is INCORRECT. If (A) is incorrect but (R) is correct. ANSWER :B

Discussion

86767.	(A) The presence of a large number of Schottky defects in NaCZ lowers its density. (R) In NaCZ, there are approximately 10^(6) Schottky pairs per 1 cm3 at room temperature.
Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is false Both (A) and (R) are false Answer :B

Discussion

86768.	(A) The pka of acetic acid is lower than that of phenol. (R) Phenoxide ion is more resonance stabilised than acetate ion.
Answer» Both (A) and (R) are true and (R) is the correct EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is false Both (A) and (R) are false Answer :C

Discussion

86769.	(A) The overall order of the reaction is the sum of the exponents of all the reactants in the rate expression. (R ) There are many higher order reactions
Answer» Both (A) and (R ) are true and (R ) is the CORRECT explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :C

Discussion

86770.	(A) The order of a reaction may be nagative. (R ) In some cases, the rate of reaction decreases as the concentration of the reactant increases.
Answer» Both (A) and (R ) are TRUE and (R ) is the correct explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :A

Discussion

86771.	(A)the octane numberofbranchedchainhydrocarbonis higherthanthatof unbranched chain hydrocarbon . ( R) thebranched chainhydrocarbonsare morevolatileascomparedto unbrachedchainhydrocarbons .
Answer» if both(A) and (R ) are correct and ( R) is THECORRECT explanationof the(A) ifboth(A) and (R ) are correct but ( R) is not thecorrectexplanationof the(A) if (A) is correct but ( R) is INCORRECT is (A)in incorrect but( R)is correct Answer :B

Discussion

86772.	(A) The number of unpaired electrons in the following gaseous ionMn^(3+),Cr^(3+),V^(3+) and Ti^(3+) are 4,3,2 and 1 respectively (R) Cr^(3+) ismost stable
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution :Both (A) and (R) are true and (R) is not the correct explanation of (A)

Discussion

86773.	(A) The nucleus of gold is stable even though there is a very strong coulombic repulsion among the protons. (R ) The inverse square coulomb force is exactly balanced by another inverse square force which is very powerful i.e., nuclear force
Answer» If both (A) and (R ) are CORRECT and (R ) is the correct EXPLANATION for (A). If both (A) and (R ) are correct but (R ) is not the correct explanation for (A ) If both (A) and (R ) are incorrect. If both (A) and (R ) are incorrect. Answer :C

Discussion

86774.	(A) The number of significant figures in 507000 is three. (R) In 507000, all the zeros are significant.
Answer» If both (A) and (R) are CORRECT and (R) is the correct EXPLANATION of (A). If both (A) and (R) are correct but (R) is not the correct explanation of (A). If (A) is correct but (R) is WRONG. If (A) is wrong but (R) is correct. Answer :A

Discussion

86775.	(a) The nucleophilic substitution of primary alkyl chlorides with sodium acetate is catalysed by sodium iodide. (b) p-Methoxybenzayl bromide reacts faster than p-nitrobenzyl bromide with ethanol to form a ether product.
Answer» Solution :(a). In presence of NaI, alkyl chlorides form alkyl IODIDES which being more reactive CATALYSE the NUCLEOPHILIC substitution reaction. (b) p-Methoxybenzyl CATION is stabilized by the +R-effect of the methoxy group while p-nitrobenzyl cation is destabilized by the -R-effect of the `NO_(2)` group.

Discussion

86776.	(A) The noble metals like gold ,platinum dissolved in aqua regia (R ) 3:1 ratio of Conc HCl and Conc HNO_(3) is called aqua regia
Answer» Both (A) and (R ) are true and (R ) is the correct explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :B

Discussion

86777.	(A) The nature of the solvent can influence the rotation of plane polarised light (R) Rotation of the plane polarised light depends up on the nature and concen-tration of the substance.
Answer» Both (A) and (R) are CORRECT and (R) is the correct explanation of (A) Both (A) and (R) are correct but (R) is not the correct explanation of (A) (A) is True but (R) is FALSE Both (A) and (R) are false ANSWER :A

Discussion

86778.	(A) The most common oxidation state of lanthanides is + 3. (R) Lanthanides have three electrons in their outermost shell.
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution : (A) is true but (R) is false

Discussion

86779.	(A) : The most common oxidation state of lanthanides is +3. (R): Lanthanides have three electrons in their outermost shell.
Answer» Both A & R are true, R is the correct EXPLANATION of A Both A & R are true, R is not correct explanation of A A is true, R is FALSE A is false, R is true Answer :C

Discussion

86780.	(A) The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different. (R) Water is polar and benzene is non-polar.
Answer» If both (A) and (R) are CORRECT and (R) is the correct EXPLANATION of (A). If both (A) and (R) are correct but (R) is not correct explanation of (A). If (A) is correct but (R) is INCORRECT. If (A) is incorrect but (R) is correct. ANSWER :A

Discussion

86781.	(A): The mole fraction of argon in air is 0.95 (R): The volume percentage of all noble gases in air is equal to unity
Answer» Both (A) and (R) are true and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is false Both (A) and (R) are false Answer :D

Discussion

86782.	(a) The molar conductivities at infinite dilution of potassium chloride, hydrochloric acid and potassium acetate are 130.1, 379.4 and 95.6 S cm^(2)mol^(-1) respectively. Calculate the value of molar conductivity at infinite dilution for acetic acid. (b) If the molar conductivity of given acetic acid solution is 48.5 S cm^(2)mol^(-1) at 25^(@)C, calculate the degree of dissociation of acetic for acetic acid.
Answer» Solution :`wedge^(@)(CH_(3)COOH)=wedge^(@)(CH_(3)COOK)+wedge^(@)(HCl)-wedge^(@)(KCl)=95.6+379.4-130.1=344.9" S "CM^(2)MOL^(-1)` `alpha=(wedge_(m)^(@))/(wedge_(m)^(@))=(48.5)/(344.5)=0.141`

Discussion

86783.	(A): The molar conductance of weak electrolytes is low as compared to that of strong electrolytesat moderate concentrations (R) :Weak electrolytes at moderate concentrations dissociate to a much greater extent when comparedto strong electrolytes
Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE (A) is false but (R) is true Answer :C

Discussion

86784.	(A) The mass of the products formed in a reaction depends upon the limiting reactant. (R ) Limiting reactant reacts completely in the reaction.
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is false Both (A) and (R ) are false Answer :A

Discussion

86785.	(A) The major products formed by heating (R) Para amino benzyl carbocation is more stable
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Answer :A

Discussion

86786.	(A) The locant (2,8,7) is preferred over the locant (3,4,9 ) (R) Lowest locant number at first difference is preferred.
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 correct explanation of the assertion. If assertion is correct but reason isincorrect. If assertion is incorrect but reasonis correct Answer :a

Discussion

86787.	A: The major products formed by heating C_(6)H_(5)CH_(2)OCH_(3) with Hl are C_(6)H_(5)CH_(2)l and CH_(3)OH R: Benzyl cation is more stable than methyl cation.
Answer» a b C d Solution :`C_(6)H_(5)CH_(2)OCH_(3) overset(H^(+))to underset(C_(6)H_(5)CH_(2)I)underset(darrI^(-))(C_(6)H_(5)CH_(2)^(+))+ CH_(3)OH` This can be EXPLAINED on the basis of `SN^(1)` mechanism, the carbonium ion produced being benzylium ion, SINCE this type is more STABLE than alkylium ion.

Discussion

86788.	(A) The IUPAC name of citric acid 2-hydroxypropane-1,2,3-tricarboxylic acid. (R) When an unbranched carbon atom is directly linked to more than two like functional groups. Then it is named as a derivative of the parent alkane which does not include the carbonatoms of the functional groups.
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 correct explanation of the assertion. If assertion is correct but reason isincorrect. If assertion is INCORRECT but REASONIS correct Answer :a

Discussion

86789.	(A) The IUPAC name for the compound C_(6)H_(5)COOCH_(2)CH_(2)COOH is3-benzoyloxy propanoic acid. (R) C_(6)H_(5)CH_(2)O is called benzoyloxy group.
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 correct explanation of the assertion. If assertion is correct but reason isincorrect. If assertion is INCORRECT but REASONIS correct Answer :C

Discussion

86790.	(A) The IUPAC name of CH_(3)-CH=CH-C-= C-H is pent-3-en-1-yne and not pent-2-en-4-yne. (R) Lowest locant rule for multiple bond is preferred.
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 correct explanation of the assertion. If assertion is correct but reason isincorrect. If assertion is INCORRECT but REASONIS correct Answer :a

Discussion

86791.	(A) The highest oxidation state of Os is +8. (R) Osmium is a 5d element
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution :Both (A) and (R) are true and (R) is not the correct explanation of (A)

Discussion

86792.	(A) The highest oxidation state of chromium in its compounds is + 6 (R) Chromium atom has only six electrons in ns and (n-1)d orbitals.
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution :Both (A) and (R) are true and (R) is the correct explanation of (A)

Discussion

86793.	(A) The heat of formation of NH_(3) is -46.1 KJ/mole (R ) NH_(3) possess intermolecular hydrogen bonds in liquid state
Answer» Both (A) and (R ) are true and (R ) is the CORRECT explanation of (A) Both (A) and (R ) are true and (R ) is not the correct explanation of (A) (A) is true but (R ) is FALSE Both (A) and (R ) are false Answer :2

Discussion

86794.	(A) The free gaseous Cr atom has six unpaired electrons. (R) Half filled s-orbitalhas greater stability
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution : (A) is true but (R) is false

Discussion

86795.	(A) The folding of polypeptide chains leads to globular proteins. (R) Globular structure is a part of secondary structure of protein.
Answer» Both A & R are TRUE, R is the CORRECT explanation of A Both A & R are true, R is not correct explanation of A A is true, R is false A is false, R is true Answer :C

Discussion

86796.	(A) The formation of SO_(3) by contact process is an example of heterogeneous catalysis (R): The reactants and product are in different phase in the formation of SO_(3) by contact process
Answer» Both (A) and (R ) are trueand (R ) is the CORRECT explanation of (A) Both (A) and (R ) are trueand (R ) is not the correct explanation of (A) (A) is true but (R ) is FALSE (A) is false but (R ) is true Answer :C

Discussion

86797.	(A) The first noble gas compound synthesised is Xe[PtF_6 ](R) Ionization enthalpy of Xe is almost equal to the ionization enthalpy of atomic oxygen
Answer» Both (A) and (R) are true and (R) is the CORRECT explanation of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is false Both (A) and (R) are false Answer :C

Discussion

86798.	X-rays of wavelength equal to 0.134 nm give a first order diffraction from the surface of a - crystal when the value of theta is 10.5^(0), then the distance between the adjacent planes in the crystal is (sin 10.5^(@)=0.1822)
Answer» 0.1124 nm 1.124 nm 0.0578 nm 0.578 nm Answer :A

Discussion

86799.	(A) The equivalent weight of an element is variable. (R) The valency of an element is variable.
Answer» If both (A) and (R) are CORRECT and (R) is the correct EXPLANATION of (A). If both (A) and (R) are correct but (R) is not the correct explanation of (A). If (A) is correct but (R) is WRONG. If (A) is wrong but (R) is correct. Answer :A

Discussion

86800.	(A) The enthalpy of atomization of zinc is the highest in 3d series. (R) Zn is a transition metal
Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) Both (A) and (R) are true and (R) is not the correct explanation of (A) (A) is true but (R) is FALSE Both (A) and (R) are false Solution :Both (A) and (R) are false

Discussion

Explore topic-wise InterviewSolutions in .

(A) The reduction of leached copper ore will be advisablewith Ironscrapthan zinc scrap (R) Zinc is more costlierthan Iron

(A) The rections 2NO+O_(2) to 2NO_(2) and 2CO+O_(2) to 2CO_(2), proceed at the same rate because they are similar. (R ) Both the oxidations of NO and CO have the same activation energy.

(A) The reactions taking place in the sun are nuclear fusion reactions. (R ) The main reason for nuclear fusion reaction in the sun is that H_(2) is present in the sun's atomosphere so that hydrogen nuclei can fuse to form helium.

(A) The rate of the reaction is the rate of change of concentration of a reactant or a product. (R ) Rate of reaction remains constant during the complete reaction.

A : The rate of sulphonation of benzene and deutrobenzene is different in the presence of oleum. R : The slow step is the breaking of C-H or C-D bond.

(A) The rate of reaction is always negative. (R ) Minus sign used in expressing the rate shows that concentration of product is decreasing

a) The rate of a particular reaction doubles when the temperature changes from 300 K to 310 K. Calculate the energy of activation of the reaction. [Given : R="8.314 JK"^(-1)" mol"^(-1)].

(A) : The rate of a chemical reaction decreases as the reaction proceeds. (R) : The reactant concentration remains constant as the reaction proceeds. The correct answer is

(A) The rate law of a reaction cannot be predicted from its balanced chemical equation, but must be determined experimentally only. (R ) The order of a reaction is always an integer like, 0,1,2 and 3.

(A) The rate law equation can be found only by experiment. (R ) Rate equations can be written from stoichiometric equation.

(A) The pyrimidine base thymine is present in RNA. (R) DNA controls the synthesis of proteins

(A) The purple colour of KMnO_4 is due to the charge transfer transition (R) The intense colour in most of the transition metal complexes is due to d-d transition

(A): The preservation of meat by salting and of fruits by adding sugar protects against bacterial action (R): Due to osmosis a bacterium on salted meat (or) candid fruit loose water shrivels and dies

(A) The presence of nitro group facilitates nucleophilic (R) The intermediate carbanion is stabilized due to the

(A) The pK_(a) value of acetic acid is lower than that of phenol. ( R) Phenoxide ion is more resonance stabilized.

(A) The presence of a large number of Schottky defects in NaCZ lowers its density. (R) In NaCZ, there are approximately 10^(6) Schottky pairs per 1 cm3 at room temperature.

(A) The pka of acetic acid is lower than that of phenol. (R) Phenoxide ion is more resonance stabilised than acetate ion.

(A) The overall order of the reaction is the sum of the exponents of all the reactants in the rate expression. (R ) There are many higher order reactions

(A) The order of a reaction may be nagative. (R ) In some cases, the rate of reaction decreases as the concentration of the reactant increases.

(A)the octane numberofbranchedchainhydrocarbonis higherthanthatof unbranched chain hydrocarbon . ( R) thebranched chainhydrocarbonsare morevolatileascomparedto unbrachedchainhydrocarbons .

(A) The number of unpaired electrons in the following gaseous ionMn^(3+),Cr^(3+),V^(3+) and Ti^(3+) are 4,3,2 and 1 respectively (R) Cr^(3+) ismost stable

(A) The nucleus of gold is stable even though there is a very strong coulombic repulsion among the protons. (R ) The inverse square coulomb force is exactly balanced by another inverse square force which is very powerful i.e., nuclear force

(A) The number of significant figures in 507000 is three. (R) In 507000, all the zeros are significant.

(a) The nucleophilic substitution of primary alkyl chlorides with sodium acetate is catalysed by sodium iodide. (b) p-Methoxybenzayl bromide reacts faster than p-nitrobenzyl bromide with ethanol to form a ether product.

(A) The noble metals like gold ,platinum dissolved in aqua regia (R ) 3:1 ratio of Conc HCl and Conc HNO_(3) is called aqua regia

(A) The nature of the solvent can influence the rotation of plane polarised light (R) Rotation of the plane polarised light depends up on the nature and concen-tration of the substance.

(A) The most common oxidation state of lanthanides is + 3. (R) Lanthanides have three electrons in their outermost shell.

(A) : The most common oxidation state of lanthanides is +3. (R): Lanthanides have three electrons in their outermost shell.

(A) The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different. (R) Water is polar and benzene is non-polar.

(A): The mole fraction of argon in air is 0.95 (R): The volume percentage of all noble gases in air is equal to unity

(A): The molar conductance of weak electrolytes is low as compared to that of strong electrolytesat moderate concentrations (R) :Weak electrolytes at moderate concentrations dissociate to a much greater extent when comparedto strong electrolytes

(A) The mass of the products formed in a reaction depends upon the limiting reactant. (R ) Limiting reactant reacts completely in the reaction.

(A) The major products formed by heating (R) Para amino benzyl carbocation is more stable

(A) The locant (2,8,7) is preferred over the locant (3,4,9 ) (R) Lowest locant number at first difference is preferred.

A: The major products formed by heating C_(6)H_(5)CH_(2)OCH_(3) with Hl are C_(6)H_(5)CH_(2)l and CH_(3)OH R: Benzyl cation is more stable than methyl cation.

(A) The IUPAC name of citric acid 2-hydroxypropane-1,2,3-tricarboxylic acid. (R) When an unbranched carbon atom is directly linked to more than two like functional groups. Then it is named as a derivative of the parent alkane which does not include the carbonatoms of the functional groups.

(A) The IUPAC name for the compound C_(6)H_(5)COOCH_(2)CH_(2)COOH is3-benzoyloxy propanoic acid. (R) C_(6)H_(5)CH_(2)O is called benzoyloxy group.

(A) The IUPAC name of CH_(3)-CH=CH-C-= C-H is pent-3-en-1-yne and not pent-2-en-4-yne. (R) Lowest locant rule for multiple bond is preferred.

(A) The highest oxidation state of Os is +8. (R) Osmium is a 5d element

(A) The highest oxidation state of chromium in its compounds is + 6 (R) Chromium atom has only six electrons in ns and (n-1)d orbitals.

(A) The heat of formation of NH_(3) is -46.1 KJ/mole (R ) NH_(3) possess intermolecular hydrogen bonds in liquid state

(A) The free gaseous Cr atom has six unpaired electrons. (R) Half filled s-orbitalhas greater stability

(A) The folding of polypeptide chains leads to globular proteins. (R) Globular structure is a part of secondary structure of protein.

(A) The formation of SO_(3) by contact process is an example of heterogeneous catalysis (R): The reactants and product are in different phase in the formation of SO_(3) by contact process

(A) The first noble gas compound synthesised is Xe[PtF_6 ](R) Ionization enthalpy of Xe is almost equal to the ionization enthalpy of atomic oxygen

X-rays of wavelength equal to 0.134 nm give a first order diffraction from the surface of a - crystal when the value of theta is 10.5^(0), then the distance between the adjacent planes in the crystal is (sin 10.5^(@)=0.1822)

(A) The equivalent weight of an element is variable. (R) The valency of an element is variable.

(A) The enthalpy of atomization of zinc is the highest in 3d series. (R) Zn is a transition metal