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Question

If CO2(g) under pressure is passed into Na2CrO−4(aq), yellow colour solution changes to:

A
blue
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B
green
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C
red
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D
orange-red
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Solution

The correct option is D orange-red
If CO2(g) under pressure is passed into Na2CrO4(aq), yellow colour solution changes to orange-red colour due to formation of Na2Cr2O7(aq)

H2O+CO2H2CO3 carbonic acid
H2CO3 carbonic acid H++HCO3

2CrO24 yellow +2H+Cr2O27 orange-red +H2O

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