The given change below is exothermic or endothermic in nature?
Dissolution of sodium hydroxide in water.

Important Questions on Chemical Reactions and Equations

HARD

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 1 - Chemical Reactions and Equations>EXERCISE 1B>Q 3

Identify the reducing agent in the following reaction.

4 {NH}_{3} + 5 O_{2} \to 4 NO + 6 H_{2} O

HARD

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 1 - Chemical Reactions and Equations>EXERCISE 1B>Q 3

Identify the reducing agent in the following reaction.

H_{2} O + F_{2} \to HF + HOF

MEDIUM

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 1 - Chemical Reactions and Equations>EXERCISE 1B>Q 3

Identify the reducing agent in the following reaction:

{Fe}_{2} O_{3} + 3 CO \to 2 Fe + 3 {CO}_{2}

HARD

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 1 - Chemical Reactions and Equations>EXERCISE 1B>Q 4

On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite. A white precipitate is obtained.
(A) Write a balanced chemical equation of the reaction involved.

(B) What other name can be given to this precipitation reaction?

(C) On adding dilute hydrochloric acid to the reaction mixture, the white precipitate disappears. Why?

MEDIUM

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 1 - Chemical Reactions and Equations>EXERCISE 1B>Q 5

Give an example of a decomposition reaction. Describe an activity to illustrate such a reaction by heating:

MEDIUM

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 1 - Chemical Reactions and Equations>EXERCISE 1B>Q 6

State any two observations in an activity which may suggest that a chemical reaction has taken place. Give examples to support your answer

MEDIUM

10th CBSE