1.

A group two element M forms a carbide which is actually a methanide (i.e., it gives off methane of hydrolysis). Then, which of the following statements is/are correct for the element?

Answer»

The aqua complex of `M^(2+)` acidic.
Dolomite is an important mineral of the ELEMENT M.
`M` is toxic.
`M(OH)_(@)` is amphoteric and dissolves in excess `NaOH` to form hexahydroxido complex.

Solution :Be ( like Al) is the only element of group TWO which forms methanide, other group two elements from ethynide and allylide.
`Be_(2)C+H_(2)OtoBe(OH)_(2)+CH_(4)`
Aqua complex of `Be^(2+)` is acidic due to hydrolysis. Be (like BA) is toxic,its hydroxide is amphoteric, but it forms only tetrahydroxido complex. Dolomite is `CaCO_(3).MgCO_(3)`


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