Question

State on characteristic of chemical reaction taking place when dilute sulphuric acid is made to react with

Answer 1

(1) dilute HCL is added to sodium carbonate

(2) lemon juice is added gradually to potassium, permanganate solution

(3) dilute sulphuric acid is added to barium chloride solution

(4) quicklime is treated with water

(5) wax is burned in the form of a candle.

Ans:

(a) 1. Chemical reactions are mostly irreversible

2. Chemical reactions produce new products which are different from the constituent reactants.

3. Chemical reactions are of different types such as combination, redox etc.

(B) 1. HCl + Na2CO3 -> NaCl + H20 + CO2

brisk effervescence

2.

3. H2SO4 + BaCl2 -> BaSO4 + HCl

BaSO4 is white precipitate

4.CaO + H2O -> Ca(OH)2

5. change in physical state