HARD
10th CBSE
IMPORTANT
Earn 100

The reaction 4NH3+5O24NO+6H2O is an example of

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

62.5% studentsanswered this correctly

Important Questions on Chemical Reactions and Equations

HARD
10th CBSE
IMPORTANT
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

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

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
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
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?
MEDIUM
10th CBSE
IMPORTANT

The reaction between water and quick lime gives rise to calcium hydroxide. Which of the following statements are correct?

I. The reaction is exothermic

II. The pH of the final solution is less than 7

III. The reaction is endothermic

IV. The pH of the final solution is greater than 7