Give reasons for the following observations:It is necessary to r

Subject

Chemistry

Class

CBSE Class 12

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 Multiple Choice QuestionsShort Answer Type

11.

On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆o < P ?

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12.

Write the hybridization and magnetic behaviour of the complex [Ni(CO)4].

(At.no. of Ni = 28)

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13.

Calculate emf of the following cell at 25 °C:

 Fe | Fe2+(0.001 M) || H+ (0.01 M) | H2 (g) (1 bar) | Pt(s)

 E°(Fe2+ | Fe) = –0.44 V E°(H+ | H2 ) = 0.00 V

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14.

Give reasons for the following observations:

Leather gets hardened after tanning

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15.

Give reasons for the following observations:

Lyophilic sol is more stable than a lyophobic sol.

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16.

Give reasons for the following observations:

It is necessary to remove CO when ammonia is prepared by Haber's process.


It is necessary to remove CO when ammonia is prepared by Haber's process because CO acts as a poison and adversely affects the activity of iron catalyst, used in the process.

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17.

3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).


(Given: Molar mass of benzoic acid = 122 g mol-1, Kf for benzene = 4.9 K kg mol-1

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18.

Indicate the principle behind the method used for the refining of zinc.

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19.

What is the role of silica in the extraction of copper?

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20.

Which form of the iron is the purest form of commercial iron?

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