In Fig 4.1 you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.

(a) _____ is a metal.

(b) Metals are good _____ of electricity.

Which of the following metals can displace the other two metals from their salt solutions?

Zinc, Iron, Copper

Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason.

If in Fig 4.1 iron nails is replaced by wooden stick, will the bulb glow or not? Justify your answer.

Paheli prepared a blue coloured solution of copper suplhate in beaker a and placed an iron in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?