Class X Science
Subject: Chemistry
Chemical Reactions & Equations
Q. 1. 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
Right Ans:- Barium sulphate
Q. 2. 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
Right Ans:- Exothermic process
Q. 3. 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
Right Ans:- Melting of candle wax when heated
Q. 4. 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
Right Ans:- Conservation of mass
Q. 5. 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
Right Ans:- Oxidation as well as combination reactions
Q. 6. 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.
Right Ans:- Green to brown
Q. 7. 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
Right Ans:- Nitrogen gas
Q. 8. 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
Right Ans:- Aluminium dust
Q. 9. 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
Right Ans:- Double displacement reaction
Q. 10. 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
Right Ans:- Remove the layer of magnesium carbonate from the ribbon surface.
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