Chemistry
Which one of the following organic compound is used to remove stains of iron compounds?

Cinnamic acid
Benzoic acid
Oxalic acid
Phthalic acid

ANSWER DOWNLOAD EXAMIANS APP

Chemistry
The mass number of a nucleus is

a fraction
always less than its atomic number
the sum of the number of protons and neutrons present in the nucleus
always more than the atomic weight

ANSWER DOWNLOAD EXAMIANS APP