$(a)\;4\qquad(b)\;2\qquad(c)\;3\qquad(d)\;1.5$

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Equivalent mass of metal =16=$\large\frac{x}{n}$

Equivalent mass of oxygen is 8

When $x$=atomic mass of metal

$\qquad n$=valency of metal

Molecular formula of metal oxide $=M_xO_n$

$\large\frac{mass\;of\;metal\;oxide}{mass\;of\;metal}=\frac{2(16 n)+16(n)}{2(16n)}$

$\Rightarrow 1.5$

Hence (d) is the correct answer.

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