COMPETENCY BASED
(PISA BASED QUESTIONS)
chapter :-1 chemical reaction
1. .
The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:
.
Aluminium dust"
(i) Double displacement reaction".
3. All the methods mentioned below can be used to prevent the food from getting rancid except:
i. Storing the food in the air-tight containers
ii. Storing the food in refrigerator
iii. Keeping the food in clean and covered containers
iv. Always touching the food with clean hands .
. (iii) and (iv).".
Oxidation as well as combination reactions ".
5. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to: .
Remove the layer of magnesium carbonate from the ribbon surface".
6. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
.
part :- iv
chapter :-1 chemical reaction
class 10
1. .
The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:
.
Aluminium dust"
2. The neutralization reaction between an acid and a base is a type of:.
(i) Double displacement reaction".
3. All the methods mentioned below can be used to prevent the food from getting rancid except:
i. Storing the food in the air-tight containers
ii. Storing the food in refrigerator
iii. Keeping the food in clean and covered containers
iv. Always touching the food with clean hands .
:
. (iii) and (iv).".
4. Rusting of iron involves a chemical reaction which is a combination of:. :
Oxidation as well as combination reactions ".
5. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to: .
Remove the layer of magnesium carbonate from the ribbon surface".
6. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
.
.
... Answer is ii)
(ii) Barium sulphate ".
7. The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of: .
(i) Exothermic process".
8. A chemical reaction does not involve.
(iv) Changing of the atoms of on element into those of another element to form new products.".
9. It is necessary to balance a chemical equation in order to satisfy the law of: .
(iv)Conservation of mass.".
10. Which of the following gases is used in the storage of fat and oil containing foods for a long time? .
(ii) Nitrogen gas".