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    Subject
    Chemistry

    Class

    ICSE Class 12

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    ISC Class 12 Chemistry Solved Question Paper 2008

    Multiple Choice QuestionsShort Answer Type

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    21. A 0.05 M NaOH solution offered a resistance of 31.6 ohms in a conductivity cell. If the cell constant of the conductivity cell is 0 378 cm-1, determine the molar conductivity of sodium hydroxide solution at this temperature. 

    Given, Molarity = 0.05 M, R = 31.6 ohms

    cell constant = 0.378 cm-1, Molar conductivity (∧m) = ?

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    22.

    Give a reason for each of the following :   

    The number of hydrogen ions in an aqueous solution of acetic acid increase considerably with dilution while this is not the case with an aqueous solution of hydrogen chloride.

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    23.

    Give a reason for each of the following :   

    A mixture of NH4Cl and NH4OH is used to precipitate the metallic hydroxides of group III. 

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    24. For diamond, state the element present at the lattice sites, the number of nearest neighbours for each atom and the type of cell. State the hybridization of the carbon atom in diamond.
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    25. The rate constant of a first-order reaction is 4.5 x I x 0-2sec-1. What will be the time required for the initial concentration of 0.4 M of the reactant to be reduced to 0.2 M? 
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    26. Calculate the maximum work done when 64 g of oxygen gas occupying a volume of 7 litres is expanded isothermally and reversibly to 14 litres at 27°C [R] = 1.987 cal deg-1 mol-1].  
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    27. Diethyl ether boils at 35°C at 1 atmosphere pressure. If its heat of vapourisation is 6.5 Kcal, calculate its entropy at boiling point.
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    28. Classify the following based on the type of reagent and type of reaction :  

    left parenthesis straight i right parenthesis space straight C subscript 6 straight H subscript 6 space plus Cl to the power of plus space rightwards arrow space straight C subscript 6 straight H subscript 5 Cl space plus straight H to the power of plus ii right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 3 space plus OH to the power of minus space rightwards arrow space left parenthesis CH subscript 3 right parenthesis subscript 3 OH space plus Br to the power of minus iii right parenthesis space CH subscript 3 COCH subscript 3 space plus HCN space rightwards arrow space CH subscript 3 straight C left parenthesis OH right parenthesis space left parenthesis CN right parenthesis CH subscript 3
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    29.

    Arrange the following in increasing order of acidity and explain your order: 

    Phenol, Methanol, Water.

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    30.  How is Silicon Carbide manufactured ?
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