Question

Which of the following compound is acid ??
(a) Na2O
(b) Ca(OH)2
(c) CuO
(d) HNO3

Answer 1

HNO3 is an acid other all are bases

Answer 2

$HNO_3$ is an acid.

• The species which can donate its hydrogen ion is called an acid.
• $HNO_3$ can donate its hydrogen ion and act as an acid.
• $Na_2O$ has no hydrogen atom so, it can not act as an acid.
• $Ca(OH)_2$ has a hydrogen atom but it can not donate it so, it can not act as an acid.
• $CuO$ has no hydrogen atom so, it can not act as an acid.
• Hence the correct option is d.