Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following elements can be involved in  -  bonding?

  • Carbon

  • Nitrogen

  • Phosphorus

  • Boron


C.

Phosphorus

Phosphorus belongs to 3rd period and hence contains d-orbitals which can form  -  bonds.


2.

At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is

  • less than the rate of crystallisation

  • greater than the rate of crystallisation

  • equal to the rate of crytallisation

  • zero


C.

equal to the rate of crytallisation

At equilibrium, rate of dissolution of solute in a volatile liquid solvent is equal to rate of crystallisation.


3.

32 O2(g) O3(g); Kp for this reaction is 2.47 x 10-29. At 298 K, rG° for conversion of oxygen to ozone will be

  • 100 kJ mol-1

  • 150 kJ mol-1

  • 163 kJ mol-1

  • 2303 kJ mol-1


C.

163 kJ mol-1

rG° = 2.303 log Kp ( R = 8.314 JK-1 mol-1)rG° = -2.303 × 8.314 JK-1 mol-1 × 298 K × log 2.47 × 10-29            = 163000 J mol-1 = 163 kJ mol-1


4.

For the process to occur under adiabatic conditions, the correct condition is

  • T = 0

  • p = 0

  • q = 0 

  • W = 0


C.

q = 0 

Adiabatic process is a process in which there is no transfer of heat between the system and surroundings, (q = 0).


5.

A number of elements available in earth's crust but most abundant elements are

  • Al and Fe

  • Al and Cu

  • Fe and Cu

  • Cu and Ag


A.

Al and Fe

Aluminium is the third most abundant element by mass and iron is the second most abundant metal in the earth's crust.


6.

The rate of a gaseous reaction is given by the expression k[A] [B]. If the volume of the reaction vessel is suddenly reduced to 14 the initial volume, the reaction rate relating to original rate will be

  • 110

  • 18

  • 8

  • 16


D.

16

Rate = k[A] [B]; when volume is reduced to one- fourth of its concentration, it will become 4 times. Therefore, new rate = k[4A][4B] = 16k[A][B] = 16 times.


7.

Which one ofthe following statements about C2 molecule is wrong?

  • The bond order of C2 is 2.

  • In vapour phase, C2 molecule is diamagnetic.

  • Double bond in C2 molecule consists of both π- bonds because of the presence of 4es- in two π- molecular orbitals.

  • double bond in C2 molecule consists of one σ- bond and on π-bond.


D.

double bond in C2 molecule consists of one σ- bond and on π-bond.

Among all the given options, option d is wrong.

C2(12e-) = σ1s2 σ*1s2 σ2s2 σ* 2s2   (π2px2 = π2py2)

In C2 molecule, double bond consists of both pi (π) bonds.


8.

The osmotic pressure of blood is 8.21 atm at 37°C. How much glucose would be used for an injection that is at the same osmotic pressure as blood?

  • 22.17 gL-1

  • 58.14 gL-1

  • 61.26 gL-1

  • 75.43 gL-1


B.

58.14 gL-1

π = CRT or C = πRT

    = 8.21 atm/ 0.0821 L atm K-1 mol-1 × 310 K

    = 0.323 M 

    = 0.323 × 180 gL-1

    = 58.14 gL-1


9.

Which of the following is the increasing order of enthalpy of vaporization?

  • NH3, PH3, AsH3

  • AsH3, PH3 NH3

  • NH3, AsH3, PH3

  • PH3, AsH3, NH3


D.

PH3, AsH3, NH3

Increasing order of enthalpy of vaporization is

PH3 < AsH3 < NH3


10.

The element which forms oxides in all oxidation states + 1 to + 5 is

  • nitrogen

  • phosphorus

  • arsenic

  • antimony


A.

nitrogen

Nitrogen in N2O, NO, N2O3, NO2 or N2O4 and N2O5 nitrogen shows +1, +2, +3, +4 and +5 oxidation states respectively.