Question

A red colored compound ‘X’ when heated it decomposes to give a metallic silver deposit ‘Y’ along with the release of a neutral gas which rekindles a glowing splinter. Identify X and Y. Let this compound be ‘Y’.


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Answer 1

ANSWER

X is copper (Cu) and the black-coloured compound formed is copper oxide (CuO). The equation of the reaction involved on heating copper in given below.

All other elements that are given are not black in colour

Pb is grey in colour.

Pb is grey in colour.Fe is silver-grey.

Cr is steely-grey.

hope it helps ┐(´ー｀)┌

Answer 2

The red coloured compound is MERCURIC OXIDE (HgO)

This compound gets decomposed by heating to form a silver deposit. This is nothing but MERCURY (Hg) and the neutral gas is OXYGEN (O2) which rekindles a glowing splinter.

Equation: 2HgO ---> 2Hg + 02

∴ X = HgO, Y = Hg