####54. A white substance reacts with dilute to produce a colourless gas and a colourless solution . The reaction between and acidified solution produces a green solution and a slightly coloured precipitate . The substance burns in air to produce a gas which reacts with to yield and a colourless liquid. Anhydrous copper sulphate is turned blue on addition of this colourless liquid. Addition of aqueous or to produces first a precipitate, which dissolves in the excess of the respective reagent to produce a clear solution in each case. Identify and . Write the equations of the reactions involved. (2001, 10M)
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Solution:
- Since, the white substance gives a colourless gas with dil. , such gas may be . So, the substance may be a metal sulphide , etc.)
When gas reacts with acidified , it gives green coloured solution of alongwith slightly yellow ppt of as sulphur.
on burning in air gives . Substance on reaction with produces :
Anhydrous produces blue colour in water.
Solution produces ppt first with which dissolve in excess . Hence, must be .