The correct options are
A P is Ferrous Sulphate
B Q is ferric oxide
C G1 and G2 are acidic gases
D Both G1 and G2 formed in equimolar
The complete reactions are:
FeSO4.7H2O △ −−−−→350 oCFeSO4+7H2O
2FeSO4(Solid) △ −−−−→800 oCFe2O3(Brown Solid)+SO2(gas)+SO3(gas)