On reaction with dihydrogen, the alkali metals:

form hydrides which are ionic solids with high melting points

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form hydrides which are molecular solids with low melting points

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form hydrides which are ionic solids with low melting points

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form hydrides which are non-stoichiometric

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Solution

The correct option is A form hydrides which are ionic solids with high melting points
Alkali metals react with dihydrogen to form hydrides which are ionic solids with high melting points. The reaction can be given as:

$2 M + H_{2} ⟶ 2 M H$

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