General Science MCQ Revision Test 32 @ Indefatigable 25, DBSSS

1.     Which one of the following is not a chemical change?

• (a) Burning of candle wax

• (b) Evaporation of water

• (c) Digestion of food in our body

• (d) Cooking food

What is the chemical formula of marble?

• CaCO₃, Calcium Carbonate

• CaO, Calcium Oxide

2. Fe₂O_{3 +} 2Al ->Al₂O₃ + 2 Fe; this reaction is an example of ______.

• (a) Displacement reaction

• (b) Decomposition reaction

• (c) Double displacement reaction

• (d) Combination reaction

What happens when dilute hydrochloric acid is added to iron filings?

• Iron salt and water are produced

• No reaction takes place

• Chlorine gas and iron hydroxide are produced

• Hydrogen gas and iron chloride are produced

Which of the following is not a physical change?

• Melting of ice to give water

• Dissolution of salt in air

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• Combustion of Liquefied Petroleum Gas (LPG)

• Boiling of water to give water vapour

5. Which of the following are combination reactions?

(i) Zn + FeSO₄ -> Zn SO₄ + Fe

(ii) 4 Al + 3O₂ -> 2Al₂O₃

(iii) MgO + H₂O -> Mg (OH)₂

(iv) 2KClO₃ -> 2KCl + 3O₂

• (iv) and (ii)

• (ii) and (i)

• (iii) and (i)

• (iii) and (ii)

Which of the following is an endothermic process?

(i) Dilution of sulphuric acid

(ii) Sublimation of dry ice

(iii) Condensation of water vapour

(iv) Evaporation of water vapour

• (i) and (iii)

• (ii) only

• (iii) only

• (ii) and (iv)

Which of the following processes involve chemical reactions?

• Liquefaction of air

• Keeping petrol in a china dish in the open

• Heating copper wire in presence of air at high temperature

• Storing of oxygen gas under pressure in a gas cylinder.

Which of the following are exothermic processes?

(i) Dilution of an acid

(ii) Evaporation of water

(iii) Sublimation of camphor

(iv) Reaction of water with quick line

• (iv) and (i)

• (ii) and (iii)

• (iv) and (iii)

• ((ii) and (iii)

4NH₃ (g) + 5O₂ (g) -> 4NO (g) + 6H₂O (g). This reaction is an example of ------

(i) Displacement reaction

(ii) combination reaction

(iii) redox reaction

(iv) Neutralisation reaction

• (i) and (iv)

• (ii) and (iii)

• (i) and (iii)

• (iii) and (iv)