If Kb of HCN is 4.0 × 10-10, then the pH of 2.5 × 10-

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

In an isochoric process, the increase in internal energy is equal to:

  • the sum of heat absorbed and work done

  • the work done

  • heat absorbed

  • heat evolved


2.

75 c.c. of N/5 H2SO4, 10 c.c. of N/2 HCl and 30 c.c. of N/10 HNO3 are mixed together. The strength of the resulting acid mixture is:

  • 0.1N

  • 0.2N

  • 0.3N

  • 0.4N


3.

Among the following compounds which is planar in shape is

  • acetylene

  • benzene

  • isobutene

  • methane


4.

Which will have maximum ionization energy?

  • Na

  • Mg

  • K

  • Bi


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5.

Heat of a reaction at constant pressure is equal to:

  • HP - HR

  • HP + HR

  • HP × HR

  • HPHR


6.

One gram of mass is equal to :

  • 9 x 1020 ergs

  • 7 x 1015 ergs

  • 5 x 1010 ergs

  • 3 x 105 ergs


7.

Vapour density of a volatile substance is 4 (CH4 = 1). Its molecular weight would be:

  • 2

  • 8

  • 64

  • 128


8.

Which of the following ions is paramagnetic?

  • Cu++

  • Zn++

  • Ni++

  • Both 'a' and 'c'


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9.

The pH of blood is :

  • greater than 10

  • less than 6

  • greater than 7 and less than 8

  • greater than 8 and less than 9


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10.

If Kb of HCN is 4.0 × 10-10, then the pH of 2.5 × 10-1 molar aqueous HCN is

  • 2.0

  • 4.7

  • 5.0

  • 2 x 10-5


C.

5.0

[H+] in a solution of weak acid of conc. C and dissociation constant Kc is given as

[H+] = Ka × C   = 4.0 × 10-10 ×2.5 × 10-1         = 1 × 10-10         = 1 × 10-5 MpH    = -log[H+]         = -log10-5  = 5


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