Assertion :At room temperature water does not sublimate from ice to steam. Reason: The critical point of water is much above the room temperature.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Critical temperature is the maximum temperature, below which a substance cannot sublimate from solid to gas form.

For water, critical temperature is $374^{o} C$ , which is much higher than the room temperature.
So water doesn't sublimate form ice to steam at room temperature.

So both the Assertion and Reason are correct and Reason correctly explains the Assertion.
Option A is correct.

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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