If hydrogen sulphide gas is passed into a solution..

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If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is
A. dilute sulphuric acid
B. dilute hydrochloric acid
C. unreacted hydrogen sulphide in water
D. iron (III) chloride
E. Iron (II) chloride