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

• KNO₃

• NaNO₃

• KBr

• NaBr

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

In the ln K vs $\frac{1}{\mathrm{T}}$ plot of a chemical process having $∆$S° > 0 and $∆$H° < 0, the slope is proportional to (where K is equilibrium constant).

• -|$∆$H°|

• |$∆$H°|

• $∆$S°

• -$∆$S°

For the process,

$\frac{3}{2}$A → B, at 298 K, $∆$G° is 163 kJ mol^-1. The composition of the reaction mixture is [B] = 1 and [A] = 10000. Predict the direction of the reaction and the relation between reaction quotient (Q) and the equilibrium constant (K).

• Forwards direction because Q > K

• Reverse direction because Q > K

• Forward direction because Q < K

• Reverse direction because Q < K

The inert gas found most abundant in the atmosphere is

• He

• Ne

• Ar

• Kr

Water gas is produced by

• Passing steam over red hot coke

• Passing steam and air over red hot.

• Burning coke is excess air.

• Burning coke is limited supply of air.

127.

The strongest base among the following is

• Amide ion

• Hydroxide ion

• Trimethylamine

• Ammonia

The correct descending order of the heat liberated (in kJ) during the neutralisation of the, acids CH₃COOH (W), HF (X), HCOOH (Y) and HCN (Z) under identical conditions (K_a of CH₃COOH = 1.8 × 10^-5, HCOOH =1.8 × 10^-10 HCN = 4.9 × 10^-10 and HF = 3.2 × 10^-4)

• Y > X > Z > W

• X > Y > W > Z

• W > X > Y > Z

• Z > W > Y > X

How many times a 0.1 M strong monobasic acid solution should be diluted so that pH of the resulting solution is tripled?

• 50

• 10

• 25

• 100

The equilibrium pressure for the given reaction, is  $\mathrm{\pi }$/4 atm at 400 K. The K_p for the given reaction (in atm²) is

MSO₄.2H₂O (s) $\rightleftharpoons$ MSO₄ (s) + 2H₂O (g)

• ${\mathrm{\pi }}^2 / 4$

• $\mathrm{\pi } / 6$

• ${\mathrm{\pi }}^2 / 16$

• $\mathrm{\pi } / 16$