The reaction between \(X\) and \(Y\) produces a solid substance and a mixture of two gases, one of which is a colourless toxic gas. \(X\) and \(Y\) respectively are
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Important reaction:
\[
2NaBH_4 + I_2
\rightarrow
B_2H_6 + 2NaI + H_2
\]
\[
B_2H_6
\]
(diborane) is a colourless, highly toxic gas and is an important boron hydride.