Question

A silvery gray coloured element 'X' on heating in air becomes white in colour. Name the element 'X' and
the white coloured powdered substance. Also write the reaction.​

Answer 1

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i---- The element X is Magnesium.

              (X) 2Mg +O2→2 MgO (white powder)

ii----The chemical name of white powder formed is magnesium oxide.

iii--- To the colorless phenolpthalin, add magnesium oxide, i.e., the white powder, it turns pink showing the basic nature of white powder.

iv--- The reaction is-------

              (X) Mg + 2H2O -----------------------------Mg(OH)2  +  H2

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