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Uses of Slaked Lime

H3PO4 + 2NaOH...

Question

$H_{3} P O_{4} + 2 N a O H \to (A) N H_{4} C l \to (B) \to (C) E Δ \to (D) V i o l e t b e a d \to$ (E) is obtained along with gas (F) when (D) is heated. Gas (F) turns lime water milky and $K_{2} C r_{2} O_{7} / H^{+}$ solution green. What is (E) :

N a_{2} H P O_{4}

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N a P O_{3}

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S O_{2}

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M n O

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Solution

The correct option is C $M n O$
Option (D) is correct.
$H_{3} P O_{4} + 2 N a O H \to N a_{2} H P O_{4} N H_{4} C l \to N a (N H_{4}) H P O_{4} \to N a P O_{3} M n O Δ \to M n S O_{3} (V i o l e t)$

$C a (O H)_{2} + S O_{2} ⟶ C a S O_{3} ↓ (m i l k y)$

$C r_{2} O_{7}^{2 -} / H^{+} + S O_{2} ⟶ C r^{3 +} (g r e e n)$

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