Assertion: On passing $C O_{2}$ gas through lime water, the solution turns milky.
Reason: Acid- Base (neutralisation) reaction takes place.

Both assertion and reason are true and the reason is not the correct explanation of the assertion

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Both assertion and reason are false

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Both assertion and reason are true and the reason is the correct explanation of the assertion

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Assertion is true but reason is false

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Solution

The correct option is A Both assertion and reason are true and the reason is not the correct explanation of the assertion
When carbon dioxide gas is passed through lime water, it turns milky due to the formation of calcium carbonate.

$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
$C a (O H)_{2}$ is basic and $C O_{2}$ is acidic. Hence, they neutralised to give a salt.

Hence, option (b) is the correct answer.

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Which of these is an acid-base reaction and releases a gas that turns lime water milky?

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