Subject

Chemistry

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

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 Multiple Choice QuestionsShort Answer Type

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11.

Draw the structures of the following:

(i) XeF2
(ii) BrF3


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12.

(a) Calculate increment subscript straight r straight G for the reaction
Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s)
Given : E°cell = + 2.71 V, 1 F = 96500 C mol−1
(b) Name the type of cell which was used in Apollo space programme for providing electrical power.

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13.

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :
SO2Cl2 (g) → SO2 (g) + Cl2 (g)

Experiment

Time/s−1

Total pressure/atm

1

0

0·4

2

100

0·7

Calculate the rate constant.
(Given : log 4 = 0·6021, log 2 = 0·3010)

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14.

What are emulsions? What are their different types? Give one example of each type.

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15.

Give reasons for the following:
(i) (CH3)3P = O exists but (CH3)3N = O does not.
(ii) Oxygen has less electron gain enthalpy with the negative sign than sulphur.
(iii) H3PO2 is a stronger reducing agent than H3PO3.

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16.

(i) Write the IUPAC name of the complex [Cr(NH3)4Cl2]Cl.
(ii) What type of isomerism is exhibited by the complex [Co(en)3]3+?
(en = ethane-1,2-diamine)
(iii) Why is [NiCl4]2− paramagnetic but [Ni(CO)4] is diamagnetic?
(At. nos. : Cr = 24, Co = 27, Ni = 28)

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17.

Which of the following is a natural polymer?

Buna-S, protein, PVC

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18.

The conversion of primary aromatic amines into diazonium salts is known as __________ .

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19.

What are the products of hydrolysis of sucrose?

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20.

Write the structure of p-methyl benzaldehyde.

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