Question

pH of soil A is 7.5 with that of soil B is 4.5.Which o two of soil should be treated with chalk powder to adjust its pH and why

Answer 1

Soil B should be treated with Chalk Powder.
Because the soil B has the ph 4.5 which is acidic in nature hence to make it alkaline/basic we need to add Chalk powder.
We do not need to add Chalk powder in Soil A as it's ph is 7.5 it is already basic in nature.
Hope it helps you!