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Preparations and Uses of Sodium Bicarbonate and Common Salt

Y an element ...

Question

$Y$ (an element) is a substance which reacts with oxygen in the air vigorously to give compound $Z$ . So, $Y$ is stored under water usually. $Z$ when dissolved in water gives a compound whose formula is:

A

H_{2} {Y O}_{2}

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B

H_{2} {Y O}_{3}

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C

H_{3} {Y O}_{4}

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D

H Y

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Solution

The correct option is C $H_{3} {Y O}_{4}$
Answer is option $C .$
Phosphorus is highly reactive when exposed to air and stored under water.
$P$ reacts with oxygen to form phosphorus pentoxide.
$4 P Y + 5 O_{2} ⟶ 2 P_{2} O_{5} Z$
Phosphorus pentoxide reacts with water to form $H_{3} P O_{4}$ .
$P_{2} O_{5} + 3 H_{2} O ⟶ 2 H_{3} P O_{4} phosphoric acid$
Formula is $H_{3} Y O_{4}$ .

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