1.

A Green coloured salt X decomposes to form black coloured compound Y with the liberation of W2gas. The gas liberated when passed through limewater turns it milky.Identify X,Y and W2. note:- 2 is a superscript in 'W2' and is down but there is no option to do that. So dont get confused​

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ANSWER:

the CORRECT answer for the above TEXT is W2



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