1.

Colour changes observed during the reaction between metal oxides and hydrogen are given below (a) White to Bluish white(b) Brown toGrey (c) Yellow to Grey(d) Black to Red Arrange the above colour changes as PbO to Pb , Fe_(2)O_(3), to Fe, CuOto Cu and ZnO to Zn

Answer»

c B d a
c DA b
c b a d
b c d a

Solution :`PbO + H_(2) to Pb + H_(2)O`
Yellow `""` GREY
`Fe_(2)O_(3)+H_(2) to Fe + H_(2)O`
Brown `""`Grey
`CuO + H_(2) to Cu + H_(2)O`
Black `""` Red
`ZnO + H_(2) to Zn + H_(2)O`
White`""` Bluish white


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