Question

3. Why is rusting of iron an undesirable change?
4. Why do copper vessels turn green with the passage of time?
5. Why do silver objects turn black on exposure to air?
6. Write one use each of any two metals and non-metals.
P. Long answer questions
1. Compare the following properties of metals and non-metals: duct
onlowing properties of metals and non-metals: ductility, thermal conductivity, and
electrical conductivity.
2. Write word equations and chemical equations for the following:
(a) Reaction of zinc with sulphuric acid
(b) Reaction of magnesium with sulphuric acid
(c) Reaction of aluminium with hydrochloric acid
3. What is a displacement reaction? Explain the statement 'Iron can displace copper from its salt
solution, but copper cannot displace iron from its salt solution!
4. On the basis of the reactivity series of metals, predict how these metals will react with each of the
following salt solutions:
Metals: magnesium, zinc, copper, iron, and potassium
Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate, and potassium
sulphate
ET'S RECALL
drmnlete the concept map given below.​

Answer 1

Answer:3. Because it causes huge losses in ship industry etc.

4.in corrodes with moisture and air to form a green coating over it

5.silver reacts with sulphur dioxide in air to form ag2s which is black in colour

6. Metal: iron for contruction, silver for utensils etc Non metals:chlorine in manufacture of salt and in pools, oxygen for breathing

Explanation: