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The ashes of plants contain alkali-metals and 90% of which is

$\begin{array}{1 1}(a)\;Li&(b)\;Na\\(c)\;K&(d)\;Rb\end{array}$

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$K$ is one of the frame work elements in plants.
Hence (c) is the correct answer.
answered Jan 27, 2014 by sreemathi.v
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