Question

9. A metal surface which is freshly rubbed and cleaned using a sand paper is a) Lustrous b) Non-Lustrous c) Black. d) brown​

Answer 1

a) Lustrous

_________________

Explanation.

All metals exhibits the property lustrousness

and if it is rubbed with a sand paper the oxidised metals on its surface gets eroded and the metal looks shiny.

________________________

Hope it helped you.

Mark me as Brainliest

Answer 2

Answer:

a) Lustrous

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.