Question

A metal ‘ X ’ burns with a dazzling white flame and changes into a white

powder ‘ Y ’

Identify X and Y and write the chemical reaction involved.

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Answer 1

Answer:

The metal is magnesium (Mg).

It is available in the form of magnesium ribbon.

Magnesium ribbon burns in air to produce a dazzling white flame and leaves behind a powder magnesium oxide (MgO).This reaction can be started as follows:

Mg+O2 --------------> MgO

(magnesium + oxygen --------------> Magnesium oxide)

Answer 2

Answer:

The metal X is Mg (magnesium) and Y is MgO (magnesium oxide)

Explanation:

Magnesium burns with a dazzling white flame and changes into a white powder of magnesium oxide which dissolves in water and give a basic solution which turns red litmus to blue.

The chemical reaction involved are:

$2MgO+0_{2}$ gives $2MgO$

$MgO+H_{2}O$ gives $Mg(OH)_{2}$

Hence X is Mg and Y is MgO

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