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Question
Chemistry
Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is
Q. Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is
2450
234
IIT JEE
IIT JEE 1997
The d-and f-Block Elements
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A
C
r
O
3
20%
B
C
r
2
O
3
59%
C
C
r
11%
D
CO
11%
Solution:
Ammonium dichromate
[(
N
H
4
)
2
C
r
2
O
7
]on heating decomposes producing green powder of
C
r
2
O
3
and
N
2
(
g
)
is evolved