First slide

Group15 or Nitrogen family

Question

White phosphorus on reaction with lime water gives calcium salt of an acid (A) along with a gas (X). Which of the following is correct?

Moderate

A

(A) on heating gives (X) and O₂
B

The bond angle in (X) is less than that in case of ammonia
C

(A) is a dibasic acid
D

(X) is more basic than ammonia

Solution

White phosphorous + Lime water → Calcium salt of an acid (A) + Gas (X)
$2 P_{4} + 8 Ca (OH)_{2} + 6 H_{2} O ⟶ 3 Ca {(H_{2} {PO}_{2})}_{2} + 2 {PH}_{3} (X)$
(A) is H₃PO₂, hypophosphorous acid.
(A) is monobasic acid.
$2 H_{3} {PO}_{2} \overset{∆}{\to} H_{3} {PO}_{4} + {PH}_{3}$

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