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Standard XII

Chemistry

Binary Compounds - Hydrides

A compound X ...

Question

A compound $X$ imparts a golden yellow flame and shows the reaction as $Z n$ powder when boiled with a concentrated aqueous solution of $(X)$ , dissolves and $H_{2}$ is evolved. Find $X$ .

KOH

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NaOH

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M g (O H)_{2}

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C a (O H)_{2}

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Solution

The correct option is B NaOH
Golden yellow flame is imparted by Na
Reaction between Zn and X (NaOH) is:
$Z n + K O H \to N a_{2} Z n O_{2} + H_{2}$
$K$ imparts purple colour to the flame, Mg gives a white flame whereas Ca gives a brick red flame.

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A compound X imparts a golden yellow flame and shows the reaction as Zn powder when boiled with a concentrated aqueous solution of (X), dissolves and H2 is evolved. Find X.

The correct option is B NaOHGolden yellow flame is imparted by Na Reaction between Zn and X (NaOH) is: Zn+KOH→Na2ZnO2+H2 K imparts purple colour to the flame, Mg gives a white flame whereas Ca gives a brick red flame.

A compound $X$ imparts a golden yellow flame and shows the reaction as $Z n$ powder when boiled with a concentrated aqueous solution of $(X)$ , dissolves and $H_{2}$ is evolved. Find $X$ .

The correct option is B NaOH
Golden yellow flame is imparted by Na
Reaction between Zn and X (NaOH) is:
$Z n + K O H \to N a_{2} Z n O_{2} + H_{2}$
$K$ imparts purple colour to the flame, Mg gives a white flame whereas Ca gives a brick red flame.