Among BMe3, BF3, BCl3 and B2H6 which one will be the best Le

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 Multiple Choice QuestionsMultiple Choice Questions

361.

Which one of the following is called amphoteric solvent ?

  • Ammonium hydroxide

  • Chloroform

  • Benzene

  • Water


362.

100 mL of 0.04 N HCl aqueous solution is mixed with 100 mL of 0.02 N NaOH solution. The pH of the resulting solution is

  • 1.0

  • 1.7

  • 2.0

  • 2.3


363.

If a system is at equilibrium, the rate of forward to the reverse reaction is :

  • less

  • equal

  • high

  • at equilibrium


364.

The equilibrium constant for the reaction N2(g) + O2(g) 2NO(g) is 4×10-4 at 200K. In presence of a catalyst the equilibrium is attained ten times faster. Therefore the equilibrium constant in presence of catalyst 2000 K is 

  • 4×10-3

  • 4×10-2

  • 40×10-4

  • 4×10-4


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365.

At a given temperature the equilibrium constant for the reaction of:

PCl5  PCl3 + Cl2 is 2.4 × 10-3. At the same temperature, the equilibrium constant for the reaction

PCl3 (g) + Cl2 (g)  PCl5 (g) is :

  • 2.4 × 10-3

  • -2.4 × 10-3

  • 4.2 × 102

  • 4.8 × 10-2


366.

For the gaseous reaction, C2H4 + H2  C2H6H = -130 kJ mol-1 carried in a closed vessel, the equilibrium concentration of the C2H6 can definitely be increased by:

  • increasing temperature and decreasing pressure

  • decreasing temperature and increasing pressure

  • increasing temperature and pressure both

  • decreasing temperature and pressure both


367.

Which of the following is correct for the reaction?

N2(g) + 3H2 (g)  2NH3 (g)

  • Kp = Kc

  • Kp < Kc

  • Kp > Kc

  • Pressure is required to predict the correlation


368.

Among the following, the most acidic is :

  • CH3COOH

  • ClCH2COOH

  • Cl2CHCOOH

  • Cl2CHCH2COOH


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369.

The solubility of CaF2 in pure water is 2.3 × 10-4 mol dm3. Its solubility product will be:

  • 4.6 × 10-4

  • 4.6 × 10-8

  • 6.9 × 10-12

  • 4.9 × 10-11


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370.

Among BMe3, BF3, BCl3 and B2H6 which one will be the best Lewis acid ?

  • BCl3

  • BMe3

  • B2H6

  • BF3


A.

BCl3

BF3 and BCl3 are better Lewis acid than BMe3 and B2H6 due to -I effect of Cl and F.

Between BCl3 and BF3, BCl3 is better Lewis acid due to lesser extent of - back bonding in it.


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