52671 + Interview Questions in Chemistry in Class 11

1.	Which hybridization is found in HClO_(4) and HClO_(3)?
Answer» `SP^(3)` `sp^(2)` `sp` `DSP^(2)` ANSWER :A

Discussion

2.	What would be the heat released when an aqueous solution containing 0.5 mol of HNO_(3) is mixed with 0.3 mol of OH^(-) (enthalpy of neutralisation is -57.1 kJ)?
Answer» `28.5 kJ` `17.1 kJ` `45.7 kJ` `1.7 kJ` Solution :0.5 MOL `HNO_(3) equiv 0.5 mol H^(+)` `H^(+) + OH^(-) to H_(2)O`,`DELTAH = -57.1 kJ` Here `OH^(-) = 0.3 mol` . Therefore, `OH^(-)` is the limiting reactant. When 1 mol of `OH^(-)` ions are NEUTRALISED, heat released = 57.1 kJ For 0.3 mol of `oh^(-)` ions, heat released `= 57.1 XX 0.3= 17.13` kJ

Discussion

3.	Which of the following species is/are planar ?
Answer» tert-Butyl free radical tert-Butyl carbocation tert-Butyl CARBANION Allyl carbanion Solution :Allyl carbanion DUE to resonance is planar, tert-Butyl free radical and tert-butyl carbocation are also planar but tert-butyl carbanion is PYRAMIDAL.

Discussion

4.	What is the volume (lit) of oxygen required at STP to completely convert 1.5 moles of sulphur into sulphurdioxide
Answer» 11.2 22.4 33.6 44.8 Answer :C

Discussion

5.	Using the equation of state pV= nRT show that at a given temperature, the density of the gas is proportion a to gas the gas pressure P.
Answer» Solution :According to ideal gas equation. `PV= NRT or P=(nRT)/(V)` `N=("MASS of gas"(m))/("Molar massof gas"(M))` `P=(mRT)/(mV)` Now, density `(d)=(m)/(v) or P=(dRT)/(M)` `(d prop P)` at CONSTANT temperature.

Discussion

6.	Two types of F X F angles are present in which of the following molecules ?
Answer» `SF_(4)` `XeF_(4)` `SF_(6)` `CF_(4)` Solution :

Discussion

7.	The volume strength of 15 N H_(2)O_(2) is
Answer» 48 V 84 V 39 V 80 V Answer :B

Discussion

8.	Which of the following is the energy of a possible excited state of hydrogen ?
Answer» `+13.6 EV` `-6.8 eV` `-3.4 eV` `+6.8 eV` ANSWER :C

Discussion

9.	The species Ar, K^(+) and Ca^(2+) contain the same number of electrons. In which order do their radii increase ?
Answer» `Ca^(2+) LT K^(+) lt Ar` `K^(+) lt Ar lt Ca^(2+)` `Ar lt K^(+) lt Ca^(2+)` `Ca^(2+) lt Ar lt K^(+)` Solution :They are isoelectronic species but their NUCLEAR charges are Ca = 20, K = 19, Ar = 18. GREATER the nuclear charge of the isoelectronic species, greater is the PULL on the ELECTRONS and smaller is the size

Discussion

10.	What is vapour of CO_(2) ?
Answer» SOLUTION :Temperature of `CO_(2)` gas is decreases than its critical temperature then it will convert into VAPOUR FORM then it is known as vapour of `CO_(2)`.

Discussion

11.	Which of the following bicarbonate is insoluble in water?
Answer» `Mg(HCO_(3))_(2)` `NaHCO_(3)` `KHCO_(3)` `CA(HCO_(3))_(2)` Answer :B

Discussion

12.	Which of the following is a redox reaction?
Answer» `NaCl+KNO_(3) to NaNO_(3)+KCL` `CaC_(2)O_(4) +2HCl to CaCl_(2)+H_(2)C_(2)O_(4)` `Mg(OH)_(2)+2NH_(4)CL to MgCl_(2)+2NH_(4)OH` `Zn+2AgCN to 2Ag +Zn(CN)_(2)` Answer :D

Discussion

13.	What is the nature of an aqueous solution of CO_2?
Answer» SOLUTION :WEAKLY ACIDIC

Discussion

14.	Which of the following possess tertiary carbon ?
Answer» Propane n-butane 2-methyl propane 2,2-dimethylpropane Solution :(A) `underset("Propane")(OVERSET(1^(@))(CH_(3))overset(2^(@))(CH_(2))overset(1^(@))(CH_(3)))` (B) `underset("n-Butane")(overset(1^(@))(C_(3))overset(2^(@))(CH_(2))overset(2^(@))(CH_(2))overset(1^(@))(CH_(3)))` (C)`underset("2-Methyl propane")(overset(1^(@))(CH_(3))-underset(""^(1^(@))CH_(3))underset(\|)overset(3^(@))(CH)-overset(1^(@))(CH_(3)))` `underset("2,2-Dimethyl propane")(overset(1^(@))(CH_(3))-underset(""^(1^(@))CH_(3))underset(\|)overset(1^(@))overset(CH_(3))overset(\|)(""^(4^(@))CH)-overset(1^(@))(CH_(3)))`

Discussion

15.	When burnt in air, 14.0g mixture of carbon and sulphur gives a mixture of CO_(2) and SO_(2) in the volume ratio of 2:1, volume being measured at the same conditions of temperature and pressure the number of moles of carbon in the mixture is
Answer» 0.75 0.5 0.4 0.25 Solution :Let WEIGHT of C be x g, then S will be `(14-x)g` `(x//12)/((14-x)//32)=(2)/(1)` `therefore x=6g," MOLES of C"=(6)/(12)=0.5`

Discussion

16.	Which of the following is used in Ion Exchange method as a lon Exchanger ?
Answer» Alum Zeolite Calgon Flake Lime Answer :B

Discussion

17.	What is the hybridisation of p inPCl_5. Why are axial P-Cl bonds longer than the equatorial bonds?
Answer» <P> SOLUTION :Hybirdisation of P in `PCl_5` is `sp^3`d. SINCE the axial bond pairs suffer more repulsive INTERACTION from the EQUATORIAL bond pairs,the axial `P-Cl` bonds are slightly longer than the equatorial bonds.

Discussion

18.	What is the action of alkali on an ammonium salt?
Answer» Solution :Ammonia is realsed when ALKALI is treated with an ammonium salt. `NH_(4)CI + NAOH to NACI + H_(2)O +NH_(3)` This is because alkali is stronger base than ammonia.

Discussion

19.	Van der waal's radius is measured for
Answer» MOLECULAR substances in GASEOUS STATE only Molecular substances in solid state only Molecular substances in liquid state only Molecular substances in any state ANSWER :B

Discussion

20.	The two structures of benzene proposed by Kekule differ in
Answer» The POSITION of CARBON nuclei The position of hydrogen nuclei The position of the SINGLE bonds The position of the double bonds ANSWER :D

Discussion

21.	Which of the following can show geometrical isomerism
Answer» 2,3 - DIMETHYL butane 2,3-dimethyl-2-butene 1,2 - dimethyl cyclo HEXANE 2 - METHYL pentane Solution :1,2 dimethyl cyclo hexane(CIS and trans) geometrical isomerism is possible in cyclic compounds

Discussion

22.	Which of the following metal has high hydration enthalpy?
Answer» LI NA K CS ANSWER :A

Discussion

23.	Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?
Answer» `HNO_(3), NO, NH_(4)Cl , N_(2)` `HNO_(3) , NO, N_(2) , NH_(4)Cl` `HNO_(3),NH_(4)Cl, NO, N_(2)` `NO, HNO_(3),NH_(4)Cl, N_(2)` ANSWER :B

Discussion

24.	What is the ratio of mass an electron to the mass of a proton
Answer» `1:2` `1:1` `1:1837` `1:3` Solution :Electron `1/1837` TIME lighter than PROTON so their mass RATIO will be 1:1837

Discussion

25.	Which onc of the following is mainly responsible for the depletion of ozone layer
Answer» Methane Carbon DIOXIDE WATER Chlorofluro carbons ANSWER :D

Discussion

26.	Which of the following are correct
Answer» gases with EQUAL P,T and `M_1 gtM_2`, then `d_1gt d_2` gases with equal P,V,T and `M_1 gt M_2`, then `N_1 = N_2` (no. of molecules) gases with equal P, V and `N_1 gtN_2` then `T_1 lt T_2` gases with equal T, N and `P_1 gt P_2`, then `V_1 gt V_2` Solution :a) `M alpha d` (at constant P,T) b) equal P,T V `IMPLIES ` equal moles `implies` equal molecules. C) `N_1 > N_2 implies n_1 > n_2 , n alpha 1/T = T_2 > T_1` d) `n ,T` same `implies P alpha 1/V implies P_1 > P_2 implies V_1 < V_2`.

Discussion

27.	What is the oxidation number of sulphur in the following molecules/ ions SO_4^(2-)
Answer» SOLUTION :In `SO_4^(2-)` LET x be oxidation number of S, Oxidation number of Oxygen is -2. `S O_4^(2-)` Let oxidation number be x -2 `THEREFORE (1 times x)+ (4 times -2)=-2 implies x-8=-2 implies x=-2+8 implies x=6` Oxidation number of S in `SO_4^(2-)` is +6.

Discussion

28.	What weight of AgCl would be precipitated if 10 mL of HCl gas measured at 12^@C and 750 mm pressure were passed into the excess of a solution of silver nitrate ?
Answer» SOLUTION :0.0605 G

Discussion

29.	Wavelength of an electron is 5Å Velocity of the electron is
Answer» `1.45 XX 10^(8)` cm/s `1.6 xx 10^(-8)` cm/s `3.2 xx 10^(-27)` cm/s `3.2 xx 10^(27)` cm/s Answer :A

Discussion

30.	Which of the following practices will not come under Green chemistry?
Answer» Use of `CO_2` as SOLVENT INSTEAD of `CI_2` Use of `H_2O_2 instead of `CI_2` Synthesis of ethanal from ethane in one step Use of tetrachloroethene as a solvent for DRY cleaning Answer :D

Discussion

31.	Which one of the following chlorides will not fume in air ?
Answer» `BiCl_(3)` `C Cl_(4)` `PCl_(5)` None of the AIR. Solution :`C Cl_(4)` will not fume in moist air.

Discussion

32.	What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.
Answer» Solution :Exothermic reactions : Reactions which evolves HEAT are known to be as exothermic reactions. Evolution of heat PRODUCED can be in the form of `.+. sign or DeltaH` in - sign along with product. `C_((s))+O_(2(g))to CO_(2(g))+393.5 kJ` `H_(2(g))+(1)/(2)O_(2(g)) to H_(2)O_((L)),` `DeltaH=-285.8 kJ"mol"^(-1)` Endothermic reactions : Reactions which absorbs heat are called endothermic reactions. Absorbed heat can be is shown as - sign or in terms of `DeltaH` with a+ singn E., `C_((s))+H_(2)O_((g)) to CO_((g))+H_(2(g))-131.4 kJ` `N_(2(g))+3H_(2(g)) to 2NH_(3(g)), DeltaH=+92.4 kJ mol^(-1)`

Discussion

33.	Which of the following is not the correct order of stability?
Answer» `CH_(3)-OVERSET(oplus)(CH_(2)) gt CH_(2)=overset(oplus)(CH)` `CH_(3)-bar(C)H_(2) LT CH_(2)=bar(C)H lt HC equiv bar(C)` `R_(2)N-overset(oplus)(CH_(2)) gt R-NH-overset(oplus)(CH_(2))` `R-O-overset(oplus)(CH_(2)) lt R-S-overset(oplus)(CH_(2))` SOLUTION :`R-O- Coverset(oplus)(H_2)` is STABILIZED by resonance `R - underset( * * )overset(* *)O- CH_2 harr R - overset(oplus)(O) = CH_2`

Discussion

34.	To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorus acid (H_(3)PO_(3)), the volume of 0.1 M aqueous KOH solution required is :
Answer» 10 mL 20 mL 40 mL 60 mL Solution :`H_(3)PO_(3)+2KOH to K_(2)HPO_(3)+2H_(2)O` `(M_(1)V_(1))/(n_(1))=(M_(2)V_(2))/(n_(2))` `(0.1xx20)/(1)=(0.1xx V_(2))/(2)` `V_(2)= 40 mL`

Discussion

35.	Which of the following is easily formed?
Answer» CALCIUM chloride Calcium bromide Potassium chloride Potassium bromide Answer :C

Discussion

36.	Water is often treated with chlorine to
Answer» INCREASE OXYGEN content Kill germs Remove SUSPENDED particles Remove hardness Answer :B

Discussion

37.	What do you understand by 'continuity of state' in gases and liquids ?
Answer» Solution :By SUITABLY ADJUSTING the conditions of temperature and pressure,it is possible to change a gas into a liquid or a liquid into a gas such that there is ALWAYS a single phase PRESENT. This is called CONTINUITY of liquid state.

Discussion

38.	Why can Solvay process not be used for the manufacture of potassium carbonate?
Answer» SOLUTION :`KHCO_3`is FAIRLY SOLUBLE in water EVEN in the PRESENCE of `CO_2`.

Discussion

39.	Which of the followingprocess must bespontaneous ?
Answer» Isobaric and isoentropic PROCESS with negativeenthalpy charge. Isobaric and isoentropic process with negativeinternal energychange . A process withconstant internal energyand ISOTHERMAL withan increase in ENTROPY ofsystem An adiabatic process with constantvolume CONSITION and entropy of systemincreasing . Answer :a,d

Discussion

40.	Which of the following has lowest melting point ?
Answer» B Al Ga Tl Solution :GALLIUM has LOWES MELTING POINT.

Discussion

41.	Which of the following is the first member of monosaccharides ?
Answer» `CH_(2)OH-OVERSET(O)overset(\|\|)(C)-CH_(2)OH` `CH_(2)OH-CHOH-CHO` `CH_(2)OH-CHOH-CHOH-CHO` `CH_(2)OH-CHOH-overset(O)overset(\|\|)(C)-CH_(2)OH` ANSWER :B

Discussion

42.	Van der Waals constant 'b' for helium is 2.93 xx 10^(-5) m^(3) mol^(-1). Calculate actual volume of helium atom. What is the radius of helium atom?
Answer» SOLUTION :Excluded volume = `b = 4 xx (V_a xx N_0)` where `V_a` is the actual volume of helium atom. `V_a = (b)/(4N_0) = (2.93 xx 10^(-5))/(4 xx 6.022 xx 10^(23))` `= 1.02 xx 10^(-29) m^3` Volume of helium atom = `4/3 PI R^3` Radius of helium atom, `r = 1.3 xx 10^(-10) m`.

Discussion

43.	Which among the following statement are correct with respect to adsorption of gases on a solid ? (1) The extent of adsorption is equal to kp^(n) according to Freundlich isotherm (2) The extent of adsorption is equal to kp^(1//n) according to Freundlich isotherm (3) The extent of adsorption is equal ((a+bp))/(ap) according to Langmuir isotherm The extent of adsorption is equal (ap)/((1+bp)) according to Langmuir isotherm (5) Freundlich adsorption fails at a low pressure
Answer» 1 and 3 1 and 4 2 and 3 2 and 4 Solution :According to FREUNDLICH ISOTHERM, `(x)/(m)=kp^(1//n)` According to Langmuir isotherm, `(x)/(m)=(ap)((1+bp))`

Discussion

44.	Why boron and aluminium tend to for, covalent compounds ?
Answer» Solution :Both boron and aluminium have give high sum total of first THREE ionisation enthalpies `(IE_(1)+IE_(2)+IE_(3))`.Hence, they cannot LOSE electrons easily to form `B^(3+)` ion or `Al^(3+)` ion. Hence, they form covalent compounds.

Discussion

45.	What is stoichiometry ?
Answer» Solution :The quantitative stats of REACTANT and PRODUCT in chemical REACTION is CALLED stoichiometry.

Discussion

46.	Which of the following cannot be used as a test for H_(2)O_(2)?
Answer» A paper dipped in PBS (BLACK) true white when brought in contact with `H_(2)O_(2)`. It liberates iodine from KI solution which gives blue color with starch solution. It gives blue color with `K_(4)[FE(CN)_(6)]`. It decolourises acidified `KMnO_(4)` solution. Solution :It does give blue with `K_(4)[Fe(CN)_(6)]`.

Discussion

47.	Whichorbitals are thenin hydrogenatom ?
Answer» SOLUTION :In HYDROGENATOM in GROUND state1s ORBITAL is there in exicited stateall the orbitals2s, 3s,3p3d,4s,4p ,4d,4f

Discussion

48.	Which one is rapidly degradable pollutants ?
Answer» Agriculture waste Plastic MATERIALS DISCARDED VEGETABLES Heavy metals Solution :Discarded vegetables

Discussion

49.	Which property is same for both normal hydrogen and deuterium
Answer» BOILING point Freezing point BOND ENERGY Bond LENGTH ANSWER :D

Discussion

50.	The value of Delta H - Delta U for the following reaction at 27^(@)C will be : N_(2(g)) + 3H_(2(g)) rarr 2NH_(3(g))
Answer» `8.314 XX 273 xx (-2)J` `8.314 xx 300 xx (-2)J` `-600R` `8.314 xx 300 xx 2J` Solution :`Delta H - Delta U = - 2RT = (-2) xx 8.314 xx 300` `= - 2 xx R xx 300`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which hybridization is found in HClO_(4) and HClO_(3)?

What would be the heat released when an aqueous solution containing 0.5 mol of HNO_(3) is mixed with 0.3 mol of OH^(-) (enthalpy of neutralisation is -57.1 kJ)?

Which of the following species is/are planar ?

What is the volume (lit) of oxygen required at STP to completely convert 1.5 moles of sulphur into sulphurdioxide

Using the equation of state pV= nRT show that at a given temperature, the density of the gas is proportion a to gas the gas pressure P.

Two types of F X F angles are present in which of the following molecules ?

The volume strength of 15 N H_(2)O_(2) is

Which of the following is the energy of a possible excited state of hydrogen ?

The species Ar, K^(+) and Ca^(2+) contain the same number of electrons. In which order do their radii increase ?

What is vapour of CO_(2) ?

Which of the following bicarbonate is insoluble in water?

Which of the following is a redox reaction?

What is the nature of an aqueous solution of CO_2?

Which of the following possess tertiary carbon ?

When burnt in air, 14.0g mixture of carbon and sulphur gives a mixture of CO_(2) and SO_(2) in the volume ratio of 2:1, volume being measured at the same conditions of temperature and pressure the number of moles of carbon in the mixture is

Which of the following is used in Ion Exchange method as a lon Exchanger ?

What is the hybridisation of p inPCl_5. Why are axial P-Cl bonds longer than the equatorial bonds?

What is the action of alkali on an ammonium salt?

Van der waal's radius is measured for

The two structures of benzene proposed by Kekule differ in

Which of the following can show geometrical isomerism

Which of the following metal has high hydration enthalpy?

Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?

What is the ratio of mass an electron to the mass of a proton

Which onc of the following is mainly responsible for the depletion of ozone layer

Which of the following are correct

What is the oxidation number of sulphur in the following molecules/ ions SO_4^(2-)

What weight of AgCl would be precipitated if 10 mL of HCl gas measured at 12^@C and 750 mm pressure were passed into the excess of a solution of silver nitrate ?

Wavelength of an electron is 5Å Velocity of the electron is

Which of the following practices will not come under Green chemistry?

Which one of the following chlorides will not fume in air ?

What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.

Which of the following is not the correct order of stability?

To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorus acid (H_(3)PO_(3)), the volume of 0.1 M aqueous KOH solution required is :

Which of the following is easily formed?

Water is often treated with chlorine to

What do you understand by 'continuity of state' in gases and liquids ?

Why can Solvay process not be used for the manufacture of potassium carbonate?

Which of the followingprocess must bespontaneous ?

Which of the following has lowest melting point ?

Which of the following is the first member of monosaccharides ?

Van der Waals constant 'b' for helium is 2.93 xx 10^(-5) m^(3) mol^(-1). Calculate actual volume of helium atom. What is the radius of helium atom?

Why boron and aluminium tend to for, covalent compounds ?

What is stoichiometry ?

Which of the following cannot be used as a test for H_(2)O_(2)?

Whichorbitals are thenin hydrogenatom ?

Which one is rapidly degradable pollutants ?

Which property is same for both normal hydrogen and deuterium

The value of Delta H - Delta U for the following reaction at 27^(@)C will be : N_(2(g)) + 3H_(2(g)) rarr 2NH_(3(g))