An element $A$ reacts with water to form a compound $B$ which is used in white washing. The compound $B$ on heating forms an oxide $C$ which on treatment with water gives back $B$ . Elements $B$ and $C$ are :

B

C a

;

C

C a (O H)_{2}

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B

C a (O H)_{2}

;

C

C a O

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B

C a O

;

C

C a (O H)_{2}

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B

C a (O H)_{2}

;

C

C a

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Solution

The correct option is B $B$ is $C a (O H)_{2}$ ; $C$ is $C a O$
Element $A$ is Calcium ( $C a$ ) which reacts with water to form calcium hydroxide $B$ ( $C a (O H)_{2}$ ). The reaction can be written as:
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2}$
Calcium hydroxide $B$ on heating looses water to form calcium oxide $C$ ( $C a O$ ).The reaction is:
$C a (O H)_{2} h e a t \to C a O + H_{2} O$

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