The standard enthalpy of vapourisation Δ_vap H° for water at 100°C is 40.66 kJ mol^-1. The internal energy of vapourisation of water 100°C (in kJ mol^-1) is (assume water vapour to behave like an ideal gas).

• + 4376

• +40.66

• +37.56

• None of these

The wavelength of associated wave of a particle moving with a speed of one-tenth that of light is 7Å. The particle must be

• electron

• proton

• nanoparticle

• photon

Which mathematical statement did not prove false?

• $∆\mathrm{E}= \mathrm{hv}$

• $\mathrm{R}=\frac{{\mathrm{me}}^4}{8{\mathrm{\epsilon }}_0^2{\mathrm{h}}^3\mathrm{c}}$

• $\mathrm{R}=\frac{{\mathrm{n}}_1^2{\mathrm{n}}_2^2\mathrm{v}}{({\mathrm{n}}_1^2-{\mathrm{n}}_2^2)\mathrm{c}}$

• $\mathrm{mvr}= \frac{\mathrm{nh}}{2\mathrm{\pi }}$

The bond order in CN^- ion is

• 2.5

• 3

• 2

• 3.5

${}_{93}{}^{239}\mathrm{Np} \mathrm{is} \mathrm{a} \mathrm{\beta }- \mathrm{emitter}$, but the product is also radioactive and give ²³⁵U. Which particles(s) is/ are emitted by the product?

• 4 neutrons

• 4 protons

• 4 protons and 2electrons

• 2 neutrons and 2 protons

If the adsorption of a gas on solid metal surface is spontaneous and exothermic, then

• H increases

• S increases

• G increases

• S decreases

What is the solubility of silver bromide in one litre of 0.4 molar NH₃ solution (K =10x10⁸)?

• 80 × 10^-6 mol

• 2.8 × 10^-3 mol

• 115 × 10^-3 mol

• 0.98 g

Which expression has no physical significance?

• ${\left(\frac{\partial \mathrm{G}}{\partial \mathrm{T}}\right)}_{\mathrm{p}}$

• ${\left(\frac{\partial \mathrm{G}}{\partial \mathrm{p}}\right)}_{\mathrm{T}}$

• ${\left(\frac{\partial (∆\mathrm{G})}{\partial \mathrm{T}}\right)}_{\mathrm{p}}$

• ${\left(\frac{\partial (∆\mathrm{G})}{\partial \mathrm{p}}\right)}_{\mathrm{T}}$

4.9 g of H₂SO₄ is present in 100 mL solution. The molarity and normality of the solution will be

• Molarity = 1M, Normality= 0.5N

• Molarity = 1M, Normality= 0.25N

• Molarity = 0.5M, Normality= 1N

• Molarity = 2M, Normality= 3N

0.0833 mole of a carbohydrate of empirical formula CH₂O contains 1.00 g of hydrogen. The molecular formula of the carbohydrate is.

• C₅H₁₀O₅

• C₃H₄O₃

• C₁₂H₂₂O₁₁

• C₆H₁₂O₆