Question

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

Answer 1

Correct Answer - A::C
`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