A magnesium ribbon is burnt in oxygen to give a white compound ' X ' accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound ' Y '. The balanced chemical equation when ' X ' is dissolved in water will be-

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2Mg+O2→2MgO

3Mg+N2→Mg3N2

MgO+H2O→Mg(OH)2

Mg+H2O→Mg(OH)2

answer is C.

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Detailed Solution

A white chemical called magnesium oxide, orMgO, is created when a magnesium ribbon burns in oxygen along with the emission of light. Magnesium oxide so makes up the chemical "X."
The magnesium nitride Mg3N2 is created when a burning magnesium ribbon is exposed to a nitrogen environment. Consequently, magnesium nitride is compound "Y." Magnesium hydroxide is created when the white compound magnesium oxide, MgO, dissolves in water.
MgO+H2O →Mg(OH)2

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