Find the number of compounds which have yellow color ppt. from the given compounds?
$A g_{2} C r O_{4}$ , $P b C r O_{4}$ , $H g_{2} C r O_{4}$ , $B a C r O_{4}$

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Solution

The number of compounds which have yellow color ppt is 2.

These include $P b C r O_{4}$ and $B a C r O_{4}$ .

Their preparation is shown below.

$N a_{2} C r O_{4} + P b (C H_{3} C O O)_{2} \to P b C r O_{4} ↓ + 2 C H_{3} C O O N a$

$B a (O H)_{2} + K_{2} C r_{2} O_{7} \to B a C r O_{4} ↓ + 2 K O H$

On the other hand, $A g_{2} C r O_{4}$ is a brown red powder and $H g_{2} C r O_{4}$ is a red powder.

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