Question

The metal surface freshly rubbed with a sand paper has ______

Answer 1

Answer:

oxide layer

Explanation:

Like rusting in case of iron, with magnesium, the oxide layer forms a white coating on the outside of the metal that will slow down or interfere with the burning process. Rubbing with sand paper helps to remove this oxide layer due to which burning speeds up.

Answer 2

Ques. 13. A metal surface which is freshly rubbed and cleaned using a sand paper is

(a) Lustrous

(b) non- lustrous

(c) black

(d) brown

Answer:

The correct answer is option (a) Lustrous.

Explanation:

All metals possess the property of lustrousness.

• The oxidised metals on the surface dissolve when the metal is buffed with sandpaper, leaving the metal brilliant.
• Magnesium's oxide layer generates a white coating on the outside of the metal, similar to how rusting occurs with iron, which will impede or slow down the burning process. Sandpaper application can assist in removing this oxide layer.
• Metals that are lustrous have a shiny appearance. Metallic lustre is the name for the metals' shiny appearance.
• Because sand paper is abrasive and causes scratches, their lustre or sheen would diminish.

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