If ${C O}_{2}$ gas is passed into $a q . {N a}_{2} {C r O}_{4}$ yellow solution, then _____________ .

a q . {N a}_{2} {C r}_{2} O_{7}

(orange) solution is formed

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a q . {C r}_{2} ({C O}_{3})_{2}

is formed

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{C r (O H)}_{3}

is precipitated

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nothing happens

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Solution

The correct option is A $a q . {N a}_{2} {C r}_{2} O_{7}$ (orange) solution is formed
Carbon dioxide gas reacts with sodium chromate, to form an orange coloured sodium dichromate.
$C O_{2} + 2 N a_{2} C r O_{4} \to N a_{2} C r_{2} O_{7} + N a_{2} C O_{3}$

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