One mole of which of the following has the highest entropy ?

• Liquid nitrogen

• Hydrogen gas

• Mercury

• Diamond

Amines behave as :

• Lewis acid

• Lewis base

• aprotic acid

• neutral compound

1 mole of H₂SO₄ is mixed with 2 moles of NaOH .The heat evolved will be :

• 57.3 kJ

• 2 x 57.3 kJ

• 57.3/2 kJ

• Cannot be predicted

One mole. of a perfect gas expands isothermally to ten times of its original volume. The change in entropy is :

• 0.1 R

• 2.303 R

• 10.0 R

• 100.0 R

For the reaction :

N₂ + 3H₂ $\rightleftharpoons$ 2NH₃ ; $\mathrm{∆}$H = ?

• $∆$E + 2RT

• $∆$E - 2RT

• $∆$E + RT

• $∆$E - RT

100 cc of 0.6 N H₂SO₄ and 200 cc of 0.3 N HCl were mixed together .The normality of the solution will be :

• 0.2 N

• 0.4 N

• 0.8 N

• 0.6 N

If the mass defect of ${}_4^0\mathrm{X}$ is 0.090 u , then binding energy per nucleon is :

(1 u = 931.5 MeV)

• 9.315 MeV

• 931.5 MeV

• 83.0 MeV

• 8.38 MeV

8.

50 mL of 0.1 M HCl and 50 mL of 0.2 M NaOH are mixed .The pH of the resulting solution is :

• 1.30

• 4.2

• 12.70

• 11.70

₂₇Co⁶⁰ is radioactive because :

• its atomic number is high

• it has high $\frac{\mathrm{p}}{\mathrm{n}}$ ratio

• it has high $\frac{\mathrm{n}}{\mathrm{p}}$ ratio

• None of the above

Conjugate acid of CH₃NH₂ is :

• CH₃OH

• CH₃NH₃⁺

• CH₂NH₂⁺

• CH₃N^-H