The desiccants used for absorbing water during Liebig's method for estimation of carbon and hydrogen are:

anhydrous

C a C l_{2}

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anhydrous

N a_{2} S O_{4}

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M g S O_{4} . 7 H_{2} O

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M g (C l O_{4})_{2}

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Solution

The correct options are
B $M g S O_{4} . 7 H_{2} O$
D anhydrous $C a C l_{2}$
Second group metal salts in the anhydrous state can be used in desiccator during Liebig's method for estimation of carbon and hydrogen, as they have high hydration energy and can absorb moisture readily.

anhydrous $C a C l_{2}$ is anhydrous and the metal belongs to 2nd group.
anhydrous $N a_{2} S O_{4}$ is anhydrous but metal belongs to the 1st group.
$M g S O_{4} .7 H_{2} O$ is in anhydrous form as $H_{2} O$ is present and the metal belongs to 2nd group.
$M g (C l O_{4})_{2}$ here metal belongs to 2nd group but it is not in anhydrous form.

Hence the correct answer is an option A and C.

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Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.

Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

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