3(ii)
Identify the gas P and Q in the reactions given below:
(a) A compound reacts with an acid to form gas P which has no effect on acidified K2Cr2O7 solution but turns lime water milky.
(b) A metallic nitrate reacts on heating gives oxygen gas along with a coloured gas Q.
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(a) Carbon dioxide [CO2]
(b) Nitrogen dioxide [NO2]