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Oxides of Nitrogen

Given below a...

Question

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.

A is false but R is true

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Both A and R are true and R is the correct explanation of A

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Both A and R are true but R is NOT the correct explanation of A

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A is true but R is false

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Solution

The correct option is A A is false but R is true
Answer: (a)

Temporary hardness of water is due to the presence of bicarbonates of calcium and magnesium.
Temporary hardness is removed by boiling the water.

During heating, magnesium bicarbonate is converted to magnesium hydroxide.

$M g (H C O_{3})_{2} \to M g (O H)_{2} ↓ + C O_{2}$

Calcium bicarbonate is converted to calcium carbonate.

$C a (H C O_{3})_{2} \to C a C O_{3} ↓ + C O_{2} + H_{2} O$

$K_{s p} M g (O H)_{2} < K_{s p} M g C O_{3}$

Hence, $M g (O H)_{2}$ precipitates first.

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Similar questions

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

M g C O_{3}

M g (O H)_{2}

M g C O_{3}

A s s e r t i o n A

R e a s o n R

A s s e r t i o n A

R e a s o n R

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

Assertion A: In $T l I_{3}$ , isomorphous to $C s I_{3}$ , the metal is present in $+ 1$ oxidation
state.

Reason R: $T l$ metals has fourteen $f$ electrons in its electronic configuration.

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

A

R

A

A

B

A

B

R

i . e . M_{A} R_{A} = M_{B} R_{B}

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