Which of the following reagents give colored precipitate (except white and black) when treated with Lunar caustic?

N a_{3} P O_{4}

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N a_{2} S_{2} O_{3}

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N a_{2} C r O_{4}

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N a_{2} S

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Solution

The correct option is C $N a_{2} C r O_{4}$ solution
(a)
$A g N O_{3} + N a_{3} P O_{4} ⟶ N a N O_{3} + A g_{3} P O_{4} y e l l o w$
(b)
$A g N O_{3} + N a_{2} S_{2} O_{3} ⟶ N a N O_{3} + A g_{2} S_{2} O_{3} w h i t e$
(c)
$A g N O_{3} + N a_{2} C r O_{4} ⟶ N a N O_{3} + A g_{2} C r O_{4} r e d$
(d)
$A g N O_{3} + N a_{2} S ⟶ N a N O_{3} + A g_{2} S b l a c k$

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