11)

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

12)

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

13)

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

14)

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

15)

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

16)

What happens when lead nitrate reacts with potassium iodide?

Class 10 Science

A)

Yellow ppt of lead iodide and potassium nitrate will be produced

B)

Large amount of hydrogen release

C)

They will not react

D)

Evolution of gas will occur

17)

Which of the following does show an oxidation reaction?

Class 10 Science

A)

Gain of hydrogen

B)

Loss of oxygen

C)

Gain of oxygen

D)

None of the above

18)

A student adds lead and silver to two different test tubes containing an equal amount of copper sulphate solution. The student observes that the color of the solution in the test tube with lead changes. What explains the change in the colour of the solution?

Class 10 Science

A)

decomposition reaction takes place as copper dissociates from sulphate in the solution.

B)

A combination reaction takes place as lead combines with sulphate in the solution.

C)

A displacement reaction takes place as lead replaces copper from the solution.

D)

A double displacement reaction takes place as copper dissociates from sulphate and lead combines with sulphate in the solution.