One mole of ammonia was completely absorbed in one litre solution

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 Multiple Choice QuestionsMultiple Choice Questions

341.

Identify a species which is not a Bronsted acid but a Lewis acid

  • BF3

  • H3+O

  • NH3

  • HCl


342.

The pH of 10-8 M HCl solution is

  • 8

  • 6.9586

  • more than 8

  • slightly more than 7


343.

For the equilibrium,

CaCO3 (s)  CaO (s) + CO2 (g) ; 

Kp = 1.64 atm at 1000 K

50 g of CaCO3 in a 10 L closed vessel is heated to 1000 K. Percentage of CaCO3 that remains unreacted at equilibrium is (Given, R = 0.082 L atm K-1 mol-1).

  • 40

  • 50

  • 60

  • 20


344.

The acid strength of active methylene group in

I. CH3COCH2COOC2H5

II. CH3COCH2COCH3

III. C2H5OOCCH2COOC2H5

decreases as

  • I > III > II

  • I > II > III

  • II > I > III

  • III > I > II


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345.

A plot of 1T vs k for a reaction gives the slope -1 × 104 K. The energy of activation for the reaction is (Given, R = 8.314 K-1 mol-1)

  • 8314 J mol-1

  • 1.202 kJ mol-1

  • 12.02 J mol-1

  • 83.14 kJ mol-1


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346.

One mole of ammonia was completely absorbed in one litre solution each of

I. 1 M HCl

II. 1 M CH3COOH 

III. 1 M H2SO4 at 298 K

The decreasing order for the pH of the resulting solution is (Given Kb (NH3) = 4.74)

  • II > III > I

  • I > II > III

  • II > I > III

  • III > II > I


C.

II > I > III

Acids which are weak in water will be highly acidic in NH3

(a) HCl + NH3  NH4Cl

(b) CH3COOH + NH3  CH3COONH4

(c) H2SO4 + NH3  (NH4)2SO4

 Effect of ammonia is least in H2SO4 and maximum in CH3COOH.

 Order of acidic strength of resulting solution is 

(NH4)2SO4 > NH4Cl > CH3COONH4

 Order of pH of resulting solution is

CH3COONH4 > NH4Cl > CH3COONH4

Hence, correct option is II > I > III.


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347.

Conductivity of a saturated solution of a sparingly soluble salt AB at 298 K is 1.85 10-6 Sm-1. Solubility product of the salt AB at 298 K is

(Given, °m (AB) = 140  Sm2 mol-1)

  • 5.7 × 10-12

  • 1.32 × 10-12

  • 7.5 × 10-12

  • 1.74 


348.

For the properties mentioned, the correct trend for the different species is in

  • strength as Lewis acid - BCl3 > AlCl3 > GaCl3

  • inert pair effect - Al > Ga > ln

  • oxidising property - Al3+ > ln3+ > Ti3+

  • first ionization enthalpy - B > Al > Ti


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349.

In the reaction,

Fe(OH)3 (s)  Fe3+ (aq) + 3OH- (aq), if the concentration of OH- ions is decreased by 14 times, then the equilibrium concentration of Fe3+ will increase by

  • 8 times

  • 16 times

  • 64 times

  • 4 times


350.

Equilibrium constants K1 and K2 for the following equilibria,

I. NO (g) + 12 O2 (g)  NO2 (g)

II. 2NO2 (g)  2NO (g) + O2 (g) are related as

  • K1K2

  • K21K1

  • K1 = 2K2

  • K21K12


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