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Reaction of Metals with Water/Steam

Assertion: So...

Question

Assertion: Sodium reacts vigorously with cold water but magnesium does not react with cold water.
Reason: Sodium is more reactive than magnesium.

A

Assertion: True, Reason: False

Reason is not the correct explanation of assertion.

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B

Assertion: True, Reason: True

Reason is the correct explanation of assertion.

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C

Assertion: False, Reason: False

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D

Assertion: False, Reason: True

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Solution

The correct option is B Assertion: True, Reason: True

Reason is the correct explanation of assertion.
Sodium reacts vigorously with water to produce sodium hydroxide and hydrogen gas. The hydrogen gas evolved immediately catches fire. This can be represented as:

$Sodium + Water \to Sodium hydroxide + Hydrogen gas$

On the other hand, magnesium does not react with cold water and hot water. It reacts only with steam. Hence, both assertion and reason are correct and reason is the correct explanation.

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Reaction of Metals with Water/Steam

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