Question

The sample of soil from a particular place was tested for its pH value. It came out to be 5. Which one of the following should be added to the soil to make it suitable for the plant growth. (i) Calcium chloride(ii)Calcium Hydroxide (iii) Calcium oxide​

Answer 1

Answer:

(iii) CALCIUM OXIDE

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Answer 2

Answer:

Here, We are Given with three chemical substances.

Calcium chloride is a neutral salt.

Calcium hydroxide is a strong base.

Calcium oxide is a basic oxide.

Out of these three, second and third, that is Calcium hydroxide and calcium oxide will effect am acidic environment and can make it neutral, a better pH for plant growth.

The pH value of the soil sample was 5. It is below 7, that means the soil is acidic, and unfavourable for plant growth.

Hence, to make it neutral, a base is to be added.

Hence, your answer is (ii) Calcium Hydroxide and (iii) Calcium Oxide).

MORE INFORMATION -

pH means power of hydrogen. It is basically a scale to measure the acidity and the basicity of the substance.

The pH between 0-7 is acidic and between 7-14 is basic.

The substance which has pH 7 is said to be a neutral substance. The lower the pH, the higher the concentration of H+ ions, and the higher the pH, the higher the concentration of OH- ions.