The work done during combustion of 9 × 10^-2 kg of ethane, C₂H₆ (g) at 300 K is (Given R = 8.314 J deg^-1 mol^-1, atomic mass C = 12, H= 1).

• 6.236 kJ

• -6.236 kJ

• 18.71 kJ

• -18.71 kJ

The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g of water is

• 1.689 mol kg^-1

• 0.1689 mol kg^-1

• 0.5922 mo kg^-1

• 0.2533 mol kg^-1

Identify the weakest oxidising agent among the following.

• Li⁺

• Na⁺

• Cd⁺

• I₂

Calculate the work done during compression of 2 mol of an ideal gas from a volume of 1 m³ to 10 dm³ 300K against a pressure of 100 KPa

• -99 kJ

• +99 kJ

• +22.98 kJ

• -22.98 kJ

5.

Which element among the following does form p$\mathrm{\pi }$ - p$\mathrm{\pi }$ multiple bonds?

• Arsenic

• Nitrogen

• Phosphorus

• Antimony

Which of the following statement(s) is/are incorrect for pair of elements Zr-Hf?

• Both possess same number of valence electrons

• Both have identical sizes

• Both have almost identical radii

• Both of these belong to same period of periodic table

Solubility of which among the following solids in water changes slightly with temperature?

• KNO₃

• NaNO₃

• KBr

• NaBr

The colour and magnetic nature of manganate ion (MnO${}_4^{2-}$) is

• green, paramagnetic

• purple, diamagnetic

• green, diamagnetic

• purple, paramagnetic

Which among the following equation represents Arrhenius equation?

• $\mathrm{k} = {{\mathrm{A}}_{\mathrm{e}}}^{{\mathrm{E}}_{\mathrm{a}}/ \mathrm{RT}}$

• k = A . ${\mathrm{e}}^{\mathrm{RT}/ {\mathrm{E}}_{\mathrm{a}}}$

• $\mathrm{k} = \frac{\mathrm{A}}{{\mathrm{e}}^{{\mathrm{E}}_{\mathrm{a}}/ \mathrm{RT}}}$

• k = $\frac{\mathrm{A}}{{\mathrm{e}}^{\mathrm{RT}/ {\mathrm{E}}_{\mathrm{a}}}}$

The first law of thermodynamics for isothermal process is

• q = -W

• $∆$U = W

• $∆$U = q_v

• $∆$U = -q_v