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#CHEMICAL REACTION

1.) Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

a) Make the ribbon surface shinier

b) Remove the layer of magnesium oxide from the ribbon surface

c) Remove the layer of magnesium carbonate from the ribbon surface

d) Remove the moisture from the ribbon surface

2.) In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:

a) Hydrochloric acid

b) Barium sulphate

c) Chlorine

d) Sulphur

3.) 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:

a) Exothermic process

b) Endothermic process

c) Reversible process

d) Physical process

4.)A chemical reaction does not involve:

a) Formation of new substances having entirely different properties than that of the reactants

b) Breaking of old chemical bonds and formation of new chemical bonds

c) Rearrangement of the atoms of reactants to form new products

d) Changing of the atoms of on element into those of another element to form new products

5.) One of the following processes does not involve a chemical reaction. That is:

a) Melting of candle wax when heated

b) Burning of candle wax when heated

c) Digestion of food in our stomach

d) Ripening of banana

6.) It is necessary to balance a chemical equation in order to satisfy the law of:

a) Conservation of motion

b) Conservation of momentum

c) Conservation of energy

d) Conservation of mass

7.) All the methods mentioned below can be used to prevent the food from getting rancid except:

a) Storing the food in the air-tight containers

b) Storing the food in refrigerator

c) Keeping the food in clean and covered containers

d) Always touching the food with clean hands

8.) Rusting of iron involves a chemical reaction which is a combination of:

a) Reduction as well as combination reactions

b) Oxidation as well as combination reactions

c) Reduction as well as displacement reactions

d) Oxidation as well as displacement reactions

9.) When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

a) Blue to green.

b) Green to blue.

c) Green to brown.

d)Green to yellow.

10.) You are given the following chemical reaction: Cuo + H2 ----->(heat) Cu + H2o This reaction represents:

a) Combination reaction as well as double displacement reaction

b) Redox reaction as well as displacement reaction

c)Double displacement reaction as well as redox reaction

d)Decomposition reaction as well as displacement reaction

11.) Which of the following gases is used in the storage of fat and oil containing foods for a long time?

a) Carbondioxide gas

b) Nitrogen gas

c) Oxygen gas

d)Neon gas

12.) The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

a)Copper granules

b)Magnesium ribbon

c)Sodium pellets

d)Aluminium dust

13.) The neutralization reaction between an acid and a base is a type of:

a)Double displacement reaction

b) Displacement reaction

c) Addition reaction

d)Decomposition reaction

14.) Boojho Appeared In Class Test Where He Wrote Some Statements But He Confused To Know The Incorrect Statement. Would You Help Him To Know That?

a) The substance which take part in a chemical reaction are called reactants.

b) The new substances produced as a result of chemical reaction are called products.

c)During a chemical reaction, atoms of one element do not change into those of another element.

d)None of the above

15.) Which Of The Following Are Exothermic Processes?

a) Reaction of water with quick time, Dilution of an acid

b) Dilution of an acid, Evaporation of water

c) Reaction of water with quick time, Sublimation of camphor (crystals)

d)Evaporation of water, Sublimation of camphor (crystals)