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The least basic oxide is

$\begin{array}{1 1}(a)\;Cs_2O&(b)\;K_2O\\(c)\;Na_2O&(d)\;Li_2O\end{array}$

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Basic nature of oxide increases down the group.
Hence the least basic oxide is$Li_2O$
Hence (d) is the correct answer.
answered Jan 27, 2014 by sreemathi.v
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