MEDIUM
8th CBSE
IMPORTANT
Earn 100
Copper reacts with dilute sulphuric acid to form copper sulphate solution and hydrogen gas.
50% studentsanswered this correctly
Important Questions on Materials : Metals and Non-Metals
HARD
8th CBSE
IMPORTANT
Match the statements in column A with those in column B.
| S.No | column A | S.No | column B |
| 1. | An allotrope of carbon that is as tensile as steel. | (a) | Graphite |
| 2. | An allotrope of carbon which has lustre. | (b) | Carbon fibre |
| 3. | A metal that is in the liquid state at room temperature. |
(c) | Tungsten |
| 4. | A metal which is a poor conductor of electricity. |
(d) | Mercury |
| 5. | An oxide of a non-metal dissolves in water. |
(e) | Basic oxide |
| 6. | An oxide of a metal which reacts with acids to form salt and water. |
(f) | Acidic oxide |
HARD
8th CBSE
IMPORTANT
State four differences between metals and non-metals.
MEDIUM
8th CBSE
IMPORTANT
Wires cannot be drawn from materials such as stone or wood. Why?
HARD
8th CBSE
IMPORTANT
(a) What do you understand by the term metal activity series?
(b)Which metals amongst the following can displace hydrogen from the acid
i)Copper ii) zinc iii) magnesium iv) silver
HARD
8th CBSE
IMPORTANT
Describe all that you observe when a piece of sodium is dropped in water.
HARD
8th CBSE
IMPORTANT
(a) What kind of oxide is formed when carbon is burnt in air or oxygen?
(b)What product is formed when the above oxide is dissolved in water?
HARD
8th CBSE
IMPORTANT
Describe all that you observe when a piece of iron is placed in copper sulphate for a few minutes. What kind of chemical reaction takes place first reaction.?
HARD
8th CBSE
IMPORTANT
Write equations for the following reactions :
(a) Aluminium and dilute hydrochloric.
b) Zinc and sodium hydroxide solution
(c) Sulphur and concentrated nitric acid
(d) Sulphur dioxide gas and water
(e) Heated iron and steam.
