**(i)** True

Since, 1 belongs to the given set {1, 2, 3} as it is present in it.

**(ii)** False

Here, a is an element and not a subset of a set {b, c, a}

**(iii)** False

Here, {a} is a subset of set {b, c, a} and not an element.

**(iv)** True

Since, we do not have repeat same elements in a given set.

**(v)** False

Given as, x + 8 = 8

i.e. x = 0

Therefore, the given set is a single ton set {0}. Here, it is not a null set.