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Types of Catalysis

Upon boiling,...

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Upon boiling, why Mg(HCO3)2 converted to Mg(OH)2 but Ca(HCO3)2 converted to CaCO3?

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Q. Assertion :Temporary hardness can be removed by addition of lime. Reason:

C a (H C O_{3})_{2}

in hard water is converted to insoluble

C a C O_{3}

on moderate heating.

80 m L

of water sample contains

0.162 g C a (H C O_{3})_{2}

0.146 g M g (H C O_{3})_{2} .

The hardness of water expressed in term of

C a C O_{3}

is:
(Given : molar mass of

C a (H C O_{3})_{2} a n d M g (H C O_{3})_{2}

are 162 and 146 g/mol respectively. )

Q. Given below are two statements : One is labelled as Assertion A and the other labelled as reason R.
Assertion A : During the boiling of water having temporary hardness,

M g (H C O_{3})_{2}

is converted to

M g C O_{3}

.
Reason R : The solubility product of

M g (O H)_{2}

is greater than that of

M g C O_{3}

.

In the light of the above statements, choose the most appropriate answer from the options given below :

Q. Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: During the boiling of water having a temporary hardness,

M g (H C O_{3})_{2}

is converted to

M g C O_{3} .

Reason R: The solubility product of

M g (O H)_{2}

is greater than that of

M g C O_{3} .

In the light of the above statements, choose the most appropriate answer from the options given below.

Q. Why does temperature remain constant as a liquid is heated and gets converted to its gaseous state at its boiling point?

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