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Science quiz

Chemical reaction

1.) Which of the following are exothermic processes? *

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (i) and (iv)

(d) (iii) and (iv)

2.) Which one of the following processes involve chemical reactions? *

(a) Storing of oxygen gas under pressure in a gas cylinder

(b) Liquefaction of air

(c) Keeping petrol in a China dish in the open

(d) Heating copper wire in presence of air at high temperature

3.) A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for the identification? * 1 point

(a) Blue litmus

(b) Red litmus

(c) Sodium carbonate solution

(d) Dilute hydrochloric acid

4.) Which of the following is not physical change? *

(a) Boiling of water to give water vapour

(b) Melting of ice to give water

(c) Dissolution of salt in water

(d) Combustion of Liquefied Petroleum Gas (LPG)

5.) Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? *

(a) Displacement reaction

(b) Precipitation reaction

(c) Combination reaction

(d) Double displacement reaction

6.) Which of the following is true for an unbalanced chemical equation? *

(a) Number of atoms is equal on both sides of the equation

(b) Number of atoms is less on the left side of the equation

(c) Number of atoms is more on the right side of the equation

(d) Both (b) and (c)

7.) Which option denotes a double displacement reaction? *

(a) A + B + C

(b) A + B → C

(c) AC + BD → AD + BC

(d) AC + B → AB + C

8.) Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is *

(a) (i) and (iv)

(b) (ii) only

(c) (i) and (ii)

(d) (iii) and (iv)

9.) Which of the following is Not True with respect to the neutralisation reaction? *

(a) Salt is formed.

(b) Reaction occurs between an acid and a base.

(c) Reactive element displaces less reactive element.

(d) Reactants are in gaseous state.

10.) In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? *

(a) Lead sulphate (insoluble)

(b) Lead acetate

(c) Ammonium nitrate

(d) Potassium sulphate

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. c. d.

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)