7
When ferrous sulphate crystals are heated in a test tube, we observe that:
- (a)A colourless gas with no smell is evolved.
- (b)A brown gas is evolved.
- (c)The green colour of the salt fades and a gas with the smell of burning sulphur is evolved.
- (d)The green colour of the salt fades and no gas is evolved.
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(C) / The green colour of the salt fades and a gas with the smell of burning sulphur is evolved. (1 Mark)