MEDIUM
10th CBSE
IMPORTANT
Earn 100

Which one of the following is used in the white washing of walls?

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Important Questions on Chemical Reactions and Equations

EASY
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 14
Which one of the following is not a physical change?
EASY
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 15
Which one of the following gases is used to prevent rancidity while packing fatty foods?

 
HARD
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 16
The reaction 4NH3+5O2→4NO+6H2O is an example of

I. Combination        II. Displacement
III. Redox                IV. Neutralization

HARD
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 17
For the reaction 3Fe(s)+4H2O(g)→Fe2O3(s)+4H2(g) which of the following statements are correct?

I. Iron is oxidised                            II. Water is reduced
III. Water acts as reducing agent   IV. Iron acts as reducing agent

MEDIUM
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 18

Which of the following are exothermic reactions?

I. Dilution of an acid.

II. Reaction between water and quick lime.

III. Sublimation of camphor.

IV. Evaporation of a liquid.

MEDIUM
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 19

Which of the following are endothermic reactions?

I. Dilution of an acid.        

II. Reaction between water and quick lime.

III. Sublimation of camphor. 

IV. Evaporation of a liquid.

MEDIUM
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 20
In each of the beakers marked A, B and C, 25 mL of water was taken. Small amounts of sodium hydroxide, anhydrous copper sulphate and ammonium chloride were added to beakers A, B and C respectively. An increase of temperature in beakers A and B were observed while there was a fall of temperature in beaker C. Which of the following statements are correct?
I. Changes in beakers A and B are endothermic.
II. Changes in beakers A and B are exothermic.
III. Change in beaker C is endothermic.
IV. Change in beaker C is exothermic.
HARD
10th CBSE
IMPORTANT
Secondary Chemistry Class X>Chapter 1 - Chemical Reactions and Equations>Multiple Choice Questions (MCQ)>Q 21
When a solution of ferrous sulphate (FeSO4) is added to an acidified purple solution of potassium permanganate (KMnO4), the purple colour fades and finally disappears. Which one of the following statements is correct?