Subject

Chemistry

Class

ICSE Class 12

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Sample Papers

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ISC Class 12 Chemistry Solved Question Paper 2006

Short Answer Type

11. Correct the following statements :

When tin is treated with cold and very dilute nitric acid, stannic acid is formed.

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12. Correct the following statements :

Oxidation of sucrose with concentrated nitric acid yields glycerol.

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13. The depression in the freezing point of a sugar solution was found to be 0.402°C. Calculate the osmotic pressure of the sugar solution at 27°C. (K_f = 1.86 K kg mol^{– 1}

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14.
A solution is prepared by dissolving 2.0 g of sucrose and 2.0 g of urea in 100 g of water at 298 K. Calculate the vapour pressure of the solution, if the vapour pressure of pure water at 298 K is 23.756 torr.

(Molecular weight of urea = 60 and sucrose = 342)

Number space space of space mole space of space sucrose space equals 2 over 342 space equals space 0.005 Number space of space mole space of space urea space equals space 2 over 60 space equals 0.03 Number space of space mole space of space straight H subscript 2 straight O space equals space 100 over 18 space equals 5.5 Mole space fraction space of space solvent space sine space sucrose space and space urea space are space non minus volatile straight x subscript straight A space equals space fraction numerator 5.5 over denominator 5.5 space plus 0.005 plus 0.03 end fraction space equals space fraction numerator 5.5 over denominator 5.535 end fraction straight x subscript straight A space equals space 0.99 straight P space equals space straight P to the power of 0 space straight A space straight x space straight x subscript straight A straight P equals 23.756 space straight x space 0.99 space Torr straight P equals 23.52

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15.

The average life-period of a radioactive nucleide is 100 hours. How long will it take for 10 g of the nucleide to lose 75 percent of its radioactivity ? [4]

(ii) Calculate the number of α -particles and β-particles emitted in a total transformation from $Th presubscript 90 presuperscript 232 space to space Pb presubscript 82 presuperscript 208$ .

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16. What is the shape of an acetylene molecule ? Mention the type of hybridization present in it.

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17. Draw the molecular orbital diagram for O⁺₂ .What is its bond order ? State whether this molecule is paramagnetic or diamagnetic.

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18. Two ionic compounds AB find AB₂ have the same solubility product. Which of the two compounds has a higher solubility at the same temperature ? Justify your answer.

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