Online Test of Class 10 Science- Chapter 1 Chemical Reactions and Equations

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Here is the Online Test of Class 10 Science for Chapter 1 Chemical Reactions and Equations

1. Which of the following are exothermic processes? *

1 point

(a) (i) and (ii)

(b) (ii) and (iii)

(d) (iii) and (iv)

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

1 point

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

(b) Liquefaction of air

(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

(d) Dilute hydrochloric acid

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

1 point

(a) Boiling of water to give water vapour

(b) Melting of ice to give 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? *

1 point

(a) Displacement reaction

(b) Precipitation reaction

(d) Double displacement reaction

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

1 point

(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

(d) Both (b) and (c).

7. Which option denotes a double displacement reaction? *

1 point

(a) A + B + C

(b) A + B → C

(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 *

1 point

(a) (i) and (iv)

(b) (ii) only

(d) (iii) and (iv)

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

1 point

(a) Salt is formed.

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

(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? *

1 point

(a) Lead sulphate (insoluble)

(b) Lead acetate

(d) Potassium sulphate

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