Assertion: Yellow coloured aqueous solution of sodium chromate changes to orange red when CO2 under pressure is passed.
Reason: Orange colour of solution is due to conversion of chromate ions into dichromate ions.
Answer & explanation
Correct answer: option 1
CO2 form acidic solution.
2CrO42- + 2H+ → Cr2O72- + H2O
(yellow) (Orange red)