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Question

Assertion :Magnesium metal burns in air to give a white ash.When this ash is treated with water, the odour of ammonia can be detected. Reason: Mg burns in air to form MgO and Mg3N2. It is the Mg3N2 which on hydrolysis gives NH3.
2Mg+O22MgO
3Mg+N2Mg3N2
Mg3N2+6H2O3Mg(OH)2+2NH3

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Magnesium metal burns in air to give a white ash.When this ash is treated with water, the odour of ammonia can be detected.
Mg burns in air to form MgO and Mg3N2. It is the Mg3N2 which on hydrolysis gives NH3.
2Mg+O22MgO
3Mg+N2Mg3N2
Mg3N2+6H2O3Mg(OH)2+2NH3
So Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hence option A is correct.

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