Answer :

**Surds** are numbers left in root form (√) to express its exact value. It has an infinite number of non-recurring decimals. Therefore, surds are irrational numbers.

Therefore,

_{i.}

It is a surd ∵ it cannot be expressed as a rational number.

_{ii.}

It is a surd ∵ it cannot be expressed as a rational number.

_{iii.}

It is a surd ∵ it cannot be expressed as a rational number.

_{iv.} _{√256 = √16}^{2} = 16

It is not a surd ∵ it is a rational number.

_{v.}

It is not a surd ∵ it is a rational number.

vi.

It is a surd ∵ it cannot be expressed as a rational number.

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