Q.

Among the following, not a scalar matrix is

Moderate

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$[\begin{matrix} 5 & 0 \\ 0 & 5 \end{matrix}]$

$[\begin{matrix} 2 & 0 \\ 0 & 2 \end{matrix}]$

$[\begin{matrix} 0 & 2 \\ 2 & 0 \end{matrix}]$

$[\begin{matrix} 1 & 0 \\ 0 & - 1 \end{matrix}]$

answer is D.

(Detailed Solution Below)

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Detailed Solution

A Square Matrix is called a Scalar Matrix, if all its non diagonal elements are zero and all diagonal elements are equal.

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