Ravi placed a zinc plate in a glass container having a blue coloured solution of a metal
sulphate MSO, for a considerable time. He found that the blue colour of solution got
lighter and lighter, and finally the solution became colourless. A red-brown deposit was
also formed on the zinc plate.
(a) Which metal, zinc or M, occurs lower in the reactivity series?
(b) Name the substance which forms colourless solution.
hour that cunlight is necessary for
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