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Allotropes of Phosphorus

What happens ...

Question

What happens when white phosphorus is heated with caustic soda?
Which of the following are possible products?

_{3}

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_{5}

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NaH

_{2}

_{2}

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NaH

_{4}

_{2}

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Solution

The correct options are
A PH $_{3}$
C NaH $_{2}$ PO $_{2}$
Options (A) and C) are correct.

When white phosphorus is heated with caustic soda, it gives phosphine and sodium hypophosphite.

$P_{4} + 3 N a O H + 3 H_{2} O ⟶ P H_{3} + 3 N a H_{2} P O_{2}$

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{P H}_{3}

{N a H}_{2} {P O}_{2}

H_{3} {P O}_{4}

{N a H}_{2} {P O}_{4}

1 M N a O H

12 g {N a H}_{2} {P O}_{4}

{N a}_{3} {P O}_{4}

a t . w t

P = 31

H_{3} {P O}_{2} + N a O H ⟶ {N a H}_{2} {P O}_{2} + H_{2} O

H_{3} {P O}_{2}

{N a H}_{2} {P O}_{4}

{N a}_{3} {P O}_{4}

M g_{2} P_{2} O_{7}

N a H_{2} P O_{4}

(Molar mass M g_{2} P_{2} O_{7} = 222 {g mol}^{- 1}, N a H_{2} P O_{4} = 120 {g mol}^{- 1})

N a H_{2} P O_{4} + M g^{2 +} + N H_{4}^{+} \to M g (N H_{4}) P O_{4} .6 H_{2} O \to M g_{2} P_{2} O_{7}

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