The fumes of NO2 are ________ in colour.
yellow
brown
pale yellow
red
B. brown
Pb + CuCl2 → PbCl2 + Cu. The given reaction is an example of a ________ reaction.
decomposition
double displacement
combination
displacement
D. displacement
How many isomers does C6H14 have?
3
6
4
5
D. 5