The enthaply change (∆H) for the reaction    &nbs

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Among the following, the species having square planar geometry for central atom are
(i) XeF4, (ii) SF4, (iii) [NiCl4]2- ,(iv) [PdCl]2-

  • (i) and (iv)

  • (i) and (ii)

  • (ii) and (iii)

  • (iii) and (iv).


2.

The de Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is

  • 6.626 × 10-34 m.

  • 13.20 × 10-34 m.

  • 10.38 × 10-21m.

  • 6.626 ×10-34A°.


3.

Dominance of strong repulsive forces among the molecules of the gas (Z = compressibility factor)

  • depends on Z and indicated by Z = 1

  • depends on Z and indicated by Z > 1

  • depends on Z and indicated by Z < 1

  • is independent of Z.


4.

40 mL of 0.1 M ammonia solution is mixed with 20 mL. of 0.1 M HCl. What is the pH of the mixture? (pKb, of ammonia solution is 4.74)

  • 4.74

  • 2.26

  • 9.26

  • 5.00


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5.

For a spontaneous process the correct statement is

  • entropy of the system always increases.

  • free energy of the system always increases.

  • total entropy change is always negative.

  • total entropy change is always positive.


6.

For a phase change

H2O(l)   0°C, 1 bar  H2O(s)

  • G = 0

  • H = 0

  • S =0

  • U = 0


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7.

The enthaply change (H) for the reaction

       N2(g) + 3H2(g) 2NH3(g)

is -92.38 kJ at 298K . The internal energy change U at 298K is

  • -92.38 kJ

  • -87.42 kJ

  • -97.34 kJ

  • -89.9 kJ


B.

-87.42 kJ

H=U+nRT[where n= no.of molecules of product - no.of molecules of reactants]or,-92.38 ×1000=U-2×8.314×298or,U=-87424 J=-87.424kJ


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8.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason : The bond length of N2 is shorter than that of oxygen.

  • If both assertion and reason are true and reason 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.

  • Both assertion and reason are false statements.


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9.

Assertion : Water in liquid state is more stable than ice at room temperature.

Reason : Water in liquid form has higher entropy than ice.

  • If both assertion and reason are true and reason 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.

  • Both assertion and reason are false statements.


10.

Borax is used as a cleansing agent because on dissolving in water it gives

  • alkaline solution

  • acidic solution

  • bleaching solution

  • basic solution.


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