CU. Green, Black
When 42 g of white solid 'X' is heated. Il g of a gas 'P' and 5 g of gas 'Q' are evolved leaving behind
a solid residue 'R' of mass 26 g.
*P is an acidic gas which turns lime water milky. "Q" is a neutral gas which condenses into a liquid
and turns anhydrous CuSO, blue in colour. The aqueous solution of 'R' is alkaline to litmus and gives
white precipitate 'S' with BaCl, solution.
Compounds 'X' and 'R' respectively are
(1) Na,Co, and NaHCO,
(2) NaHCO, and Na,CO,
(3) K S and K SO,
(4) KHCO, and K,CO,
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