Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The pH value of decinormal solution of NH4OH which is 20% ionised is

  • 12.95

  • 12.30

  • 14.70

  • 13.30


B.

12.30

Concentration NH4OH solution = 0.1 N

Concentration of OH ions in solution, 

[OH-] = 20% of 0.1N =20100×0.1

pOH = -log[OH-] = -log(0.02)                                    = 2- 0.301pH = 14-pOH = 12.30


2.

Which of the following is strongest Bronsted base?

  • ClO-

  • ClO2-

  • ClO3-

  • ClO4-


A.

ClO-

HClO4 is the strongest acid among HClO, HClO2, HClO3, and HClO4 as more the number of oxygen atoms attached, more is the acidity of the molecule order of acidity is :

HClO < HClO< HClO3 < HClO4

So the conjugate base order will be just reverse:

ClO- > ClO2- > ClO3- > ClO4-