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Polar Molecules

A silvery whi...

Question

A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reactions is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are:

A

$A l, A l (O H)_{3} a n d H_{2}$

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B

Ag, AgOH and $H_{2}$

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C

K, KCl and $H_{2}$

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D

Na, NaOH and $H_{2}$

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Solution

The correct option is D
Na, NaOH and $H_{2}$

$N a + H_{2} O \to N a O H + H_{2} + H e a t (x) (y) (z) N a O H + H C l \to N a c l + H_{2} O (p H = 7) (n e u t r a l)$

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