Which of the following is not a characteristic property of iron?

Which among the following is the most reactive metal?

The element whose oxide will turn red litmus solution to blue will be:

Which of the following reactions will not occur? Why not?

(a) Zinc sulphate + Copper Copper Sulphate + zinc

(b) Copper Sulphate + Iron iron Sulphate + copper

One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?