1)

 Which one of the following processes involve chemical reactions?

Class 10 Science

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.

2)

 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?

Class 10 Science

A)

Blue litmus

B)

Red litmus

C)

Sodium carbonate solution

D)

Dilute hydrochloric acid

3)

Which of the following is not physical change?

Class 10 Science

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)

4)

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?

Class 10 Science

A)

Displacement reaction

B)

precipitation and double displacement reaction

C)

Combination reaction

D)

Double displacement reaction

5)

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

Class 10 Science

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)

6)

Sodium and chlorine are reacted and as a result, sodium chloride is formed which is also called table salt. What option gives the reactants and products of the reaction?

Class 10 Science

A)

reactants – tables salt; products – sodium and chlorine

B)

reactants – sodium and table salt; products – chlorine

C)

reactants – sodium; products – chlorine

D)

reactants – sodium and chlorine; products – sodium chloride

7)

Which of the following reactions can also be termed as thermal decomposition reaction?

Class 10 Science

A)

Displacement reaction

B)

Decomposition Reaction

C)

Combination Reaction

D)

Double displacement reaction

8)

One of the following processes does not involve a chemical reaction, that is:

Class 10 Science

A)

Digestion of food in your stomach

B)

Burning of candle wax when heated

C)

Melting of candle wax when heated

D)

Ripening of banana

9)

From the following which one is the example of chemical reaction?

Class 10 Science

A)

Formation of curd

B)

Breakdown of food

C)

Grapes get fermented

D)

All of the above

10)

Which of the reactions is used in black and white photography?

Class 10 Science

A)

Displacement reaction

B)

Decomposition Reaction

C)

Combination Reaction

D)

Oxidation reaction