A reddish brown coloured element ‘X’ on heating in air, becomes a black coloured compound ‘Y’. X and Y are______ and ________(Cu, CuO / Pb, PbO).
Cu,CuO
Copper (element ‘X’) is reddish brown in colour which upon heating in air reacts with the oxygen present in it or gets oxidised to form Copper(II) oxide(compound ‘Y’) which is black in colour.
2