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ISC Class 12 Chemistry Solved Question Paper 2004

Short Answer Type

11.

Correct the following statements:
Ethyl acetate undergoes saponification on treatment with dilute hydrochloric acid.

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12.

Correct the following statements:
Aromatic compounds undergo nucleophilic substitution reaction.

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13.

Correct the following statements:
Isotopes have the same mass number and atomic number.

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14. Why does soda water fizz when the bottle is opened ? Name the law that explains this phenomenon.

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15. Explain nuclear fission with one example. Mention any two applications of nuclear fission.

The process in which a heavier nucleus splits up into two lighter nuclei with the release of huge amount of energy is termed as nuclear fission.

For space example colon straight U presubscript 92 superscript 235 space plus space straight n presubscript 0 superscript 1 space rightwards arrow space Ba presubscript 56 superscript 140 space plus Kr presubscript 36 superscript 93 space plus 3 subscript 0 straight n to the power of 1 space plus Energy

Two applications of nuclear fission are :

(i) It is used in nuclear power plant.

(ii) It is also used in the atom bomb.

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16. An aqueous solution containing 0.2 g of compound A in 21.7 g of water freezes at 272.814 K. If the value of K_ffor water is 1.86 K kg mol^{– 1}, calculate molecular weight of compound A.

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17. Draw the electron dot or equivalent structure of HClO₄ and name the types of bonds present.

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18. Explain the purification of common salt by bubbling hydrogen chloride gas through its solution.

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19. The initial rate of a reaction A + B → products is doubled when the initial concentration of A is doubled and increases eight fold when the initial concentration of both A and B were doubled. State the order of the reaction with respect to A and with respect to B. Write the rate equation.

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20. A gas cylinder of 5 litre capacity containing 4 kg of helium gas at 27°C developed a leak leading to the escape of gas into the atmosphere. If the atmospheric pressure was 1.0 atmosphere, calculate the work done by the gas, assuming ideal behaviour.

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