The correct descending order of the heat liberated (in kJ) during

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 Multiple Choice QuestionsMultiple Choice Questions

121.

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

  • KNO3

  • NaNO3

  • KBr

  • NaBr


122.

Which among the following equation represents Arrhenius equation?

  • k = AeEa/ RT

  • k = A . eRT/ Ea

  • k = AeEa/ RT

  • k = AeRT/ Ea


123.

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

  • -|H°|

  • |H°|

  • -


124.

For the process,

32A → 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


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125.

The inert gas found most abundant in the atmosphere is

  • He

  • Ne

  • Ar

  • Kr


126.

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


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128.

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 (Ka 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


B.

X > Y > W > Z

Given, 

Ka for CH3COOH = 1.8 × 10-5 (W)

Ka for HCOOH    = 1.8 × 10-4 (Y)

Ka for HCN         = 4.9 × 10-10 (Z)

Ka for HF           = 3.2 × 10-4 (X)

Now, Ka ∝ Strength of acid or Ka ∝ Heat liberated during neutralisation

Thus, order of heat liberated during neutralisation is HF > HCOOH > CH3COOH > HCN

i.e. X > Y > W > Z


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129.

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


130.

The equilibrium pressure for the given reaction, is  π/4 atm at 400 K. The Kp for the given reaction (in atm2) is

MSO4.2H2O (s)  MSO4 (s) + 2H2O (g)

  • π2 / 4

  • π / 6

  • π2 / 16

  • π / 16


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