Give reasons, sodium metal is always kept immersed in kerosene oil.

Give reasons, Zinc metal displaces iron from its salt solution.

Give a reason, the colour of copper sulphate solution changes when the zinc strip is dipped in it.

Why does silver get tarnished on exposure to air?

Which property of metals makes them suitable for use in jewellery?

Name the colourless gas that evolves when potassium reacts with water. How will you test this gas?

What is malleability? Which of them shows the malleability-metal or non-metal?

A piece of magnesium is put in a test tube containing hydrochloric acid. Explain the chemical reaction.

Which metal is used to make foils for packaging of food? Explain