Chemical reactions and equations

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

Carbondioxide gas

Nitrogen gas

Oxygen gas

Neon gas

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

Double displacement reaction

Displacement reaction

Addition reaction

Decomposition reaction

The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given below: H2S + I2 --> 2HI + S.The reducing and oxidizing agents involved in this redox reaction are:

Iodine and sulphur respectively

Iodine and hydrogen sulphide respectively

Sulphur and iodine respectively

Hydrogen sulphide and sulphur

The given set-up is used to carry out:

Distillation of water

Purification of water

Electrolysis of water

Hydrolysis

Rusting of iron involves a chemical reaction which is a combination of:

Reduction as well as combination reactions

Oxidation as well as combination reactions

Reduction as well as displacement reactions

Oxidation as well as displacement reactions

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

Hydrochloric acid

Barium sulphate

Chlorine

Sulphur

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:

Exothermic process

Endothermic process

Reversible process

Physical process

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

Melting of candle wax when heated

Burning of candle wax when heated

Digestion of food in our stomach

Ripening of banana

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

(i) and (ii)

(i) and (iii)

(i), (iii) and (iv)

(iii) and (iv)

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

Law of conservation of mass

Law of conservation of momentum

Law of conservation of motion

Law of conservation of energy