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Standard XII

Chemistry

Depression in Freezing Point

Question 11In...

Question

Question 11
In comparison to a 0.01 M solution of glucose, the depression in freezing point of a $0.01 M M g C l_{2}$ solution is ........... .
(a) the same (b) about twice
(c) about three times (d) about six times

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Solution

(c) As we know depression in freezing point is directly related to van't Hoff factor (i) according to which greater the value of i greater will be the drepression in freezing point.
$\begin{matrix} S o l u t i o n & I 0.01 M g l u c o s e & 1 0.01 M M g C l_{2} & 3 \end{matrix}$
Hence, depression in freezing point of $M g C l_{2}$ is about 3 times of glucose.

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Question 53
Assertion (A) When NaCl is added to water a depression in freezing point is observed.
Reason (R) The Lowering of vapour pressure of a solution causes depression in the freezing point.

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Question 11 In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01MMgCl2 solution is ........... . (a) the same (b) about twice (c) about three times (d) about six times

(c) As we know depression in freezing point is directly related to van't Hoff factor (i) according to which greater the value of i greater will be the drepression in freezing point. Solution I 0.01 M glucose 1 0.01 MMgCl2 3 Hence, depression in freezing point of MgCl2 is about 3 times of glucose.

Question 11
In comparison to a 0.01 M solution of glucose, the depression in freezing point of a $0.01 M M g C l_{2}$ solution is ........... .
(a) the same (b) about twice
(c) about three times (d) about six times