Choose the correct answer form the alternatives given.
An element X burns in nitrogen to give a compound Y which on reaction with water gives a compound Z and a gas with a pungent smell. Z can be used during construction and whitewashing. When an excess of $C O_{2}$ is bubbled through Z, a compound P is formed which on heating decomposes to give a colourless, odourless gas. Identify X, Y, Z, and P.

X - C a, Y - C a_{3} N_{2}, Z - C a (O H)_{2}, P - C a (H C O_{3})_{2}

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X - M g, Y - M g O, Z - M g (O H)_{2}, P - M g C O_{3}

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X - C a, Y - C a_{3} N_{2}, Z - C a (O H)_{2}, P - C a C O_{3}

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X - C a, Y - C a O, Z - C a (O H)_{2}, P - C a (H C O_{3})_{2}

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Solution

The correct option is A $X - C a, Y - C a_{3} N_{2}, Z - C a (O H)_{2}, P - C a (H C O_{3})_{2}$
$3 C a (x) + N_{2} \to C a_{3} N_{2} (y)$

$C a_{3} N_{2} + 6 H_{2} O \to 3 C a (O H)_{2} (z) + 2 N H_{3} (gas with a pungent smell)$

$C a (O H)_{2} (z) + C O_{2} (e x c e s s) \to C a (H C O_{3})_{2} (p)$

$C a (H C O_{3})_{2} (p) h e a t - - \to C a C O_{3} + H_{2} O + C O_{2}$

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