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The percentage of oxygen in NaOH is

$\begin{array}{1 1}(a)\;1& (b)\;8 \\(c)\;16&(d)\;40\end{array} $

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40g of NaOH contains 16g of oxygen
$\therefore$ % of oxygen =$\large\frac{16}{40}$$\times 100=40\%$
Hence (d) is the correct option.
answered Mar 25, 2014 by sreemathi.v

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