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ISC Class 12 Chemistry Solved Question Paper 2008

Short Answer Type

11. Correct the following statements by changing the underlined part of the sentence. (Do not change the whole sentence) :

The formation of chlorobenzene from benzene is a SN₂ reaction.

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12. If the molality of an aqueous solution of cane sugar is 0.4445, what is the mole fraction of cane sugar ?

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13. Albumins are the most abundant proteins in blood At 25°C, 3.5g of albumin in 100 ml of water produces an osmotic pressure of 0.014 atms. What is the molecular weight of albumin ?

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14. Draw the electron dot or any suitable diagram of nitric acid.

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15. Schematically represent the temperature-composition curve for the vapour in equilibrium with an ideal mixture of two completely miscible liquids of different boiling points. Explain with the aid of this diagram how fractional distillation is done.

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16.

Explain the following :

Zinc displaces hydrogen from acid solution [E°Zn⁺²/Zn =-0.76 volts].

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17.
Explain the following :

The hydride of sulphur is a gas but the hydride of oxygen is a liquid.

Hydride of oxygen is water and hydride of sulphur are H₂S. The water molecules are capable of forming hydrogen bonds due to the presence of hydrogen attached to oxygen. On the other hand, molecules of H₂S are held together by Vander- Waal’s forces. Since hydrogen bonding is a stronger force as compared to Vander-Waal’s forces, the molecules of water come closer and exist in form of liquid. Whereas molecules of H₂S are far apart from each other and it exists in form of gas.

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