Among the following the weakest base is from Chemistry Equilibri

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 Multiple Choice QuestionsMultiple Choice Questions

651.

For a gaseous reaction,

C2H4 + H2  C2H; H = -32.7 Kcal.

The concentration of C2H4 can be decreased by :

  • increasing pressure

  • increasing amount of H2

  • decreasing temperature

  • all of these


652.

PCl5 was heated in a 10 dm3 container at 250°C

PCl5(g)  PCl3(g) + Cl2 (g)

0.1 mol PCl5 and 0.2 mol Cl2 was found at equilibrium. The equilibrium constant for the reaction is :

  • 0.025

  • 0.04

  • 0.02

  • 0.05


653.

In the reaction,

H2SO4 + H2 H3O+ + HSO4-,

the conjugate acid of water is :

  • H3O+

  • H2O

  • HSO4-

  • SO42-


654.

At 80°C, distilled water has H+ ions concentration equal to 1 x 10-6 mole/litre. The value of KW at this temperature will be :

  • 1 X 10-6

  • 1 X 10-12

  • 1 X 10-9

  • 1 X 10-15


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655.

The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is :

(pKa for CH3COOH = 4.57)

  • 4.09

  • 6.09

  • 5.09

  • 7.09


656.

The solubility of CuBr is 2 x 10-4 mol/L at 25°C. The KSP value for CuBr is :

  • 4 x 10-8 mol2 L-2

  • 4 x 10-4 mol2 L-2

  • 4 x 10-11 mol2 L-2

  • 4 x 10-15 mol2 L-2


657.

Among the following the strongest acid is

  • CH3COOH

  • C6H5COOH

  • m-CH3OC6H4COOH

  • p-CH3OC6H4COOH


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658.

Among the following the weakest base is

  • C6H5CH2NH2

  • C6H5CH2NHCH3

  • O2NCH2NH2

  • CH3NHCHO


D.

CH3NHCHO

Among all the given options, CH3NHCHO is the weakest base. This is because carbonyl group exerts an electro withdrawal effect due to which basicity at N-atom decreases.


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659.

What is the pH of 0.01 M glycine solution? For glycine Ka1 = 4.5 ×10-3 and Ka2 = 1.7 ×10-10  at  298K?

  • 3

  • 10

  • 6.1

  • 7.2


660.

In which of the following acid-base titration, pH is greater than 8 at equivalence point?

  • Acetic acid versus ammonia

  • Acetic acid versus sodium hydroxide

  • Hydrochloric acid versus ammonia

  • Hydrochloric acid versus sodium hydroxide


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