faqs-mcqs class 10 Chemical Reactions and Equations-Why magnesium ribbon is cleaned before burning?-150

Review

Question: Why magnesium ribbon is cleaned before burning?

( A )  To remove magnesium oxide

( B )  To remove dust

( C )  To remove carbon dioxide

( D )  All of the above

Correct Answer

To remove magnesium oxide

Explanation

Magnesium is very reactive metal, hence while stored, it gradually reacts with oxygen present in air and a layer of magnesium oxide is deposited over it. This layer of magnesium oxide over magnesium ribbon prevent it reaction with oxygen. This is the cause that magnesium ribbon is cleaned using a sand paper before burning to get burned properly.

Usually burning of magnesium ribbon is done in laboratory to show the properties of burning of magnesium and product obtained after burning. The product (magnesium oxide) obtained after burning of magnesium is used for further experiment, i.e. to show its properties.

Magnesium burns with dazzling flame and gives magnesium oxide when burnt in air.

Mg + O₂ → MgO

Magnesium oxide (MgO) is white in colour and basic in nature as metals oxide are basic in nature. Milk of magnesia is used to treat acidity.

Magnesium oxide (MgO) is used as one of the component in Portland cement. Magnesium oxide is used in the soil and groundwater remediation, wastewater treatment, drinking water treatment, etc.