pH of Soil

Q.

Question 4
Under what soil conditions do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Q.

How do animals and plants grow sensitive to pH?

Q.

The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?

(a) salt

(b) lime

(c) sand

(d) compost

Q.

What should you do when acid gets on your skin?

Q.

The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why ?

Q.

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.

1. I and II

2. I and III

3. I and IV

4. II and III

Q.

Under what soil conditions do you think a farmer would treat the soil of his fields with quicklime (calcium oxide), or slaked lime (calcium hydroxide) or chalk (calcium carbonate) ?

Q. Under alkaline conditions of the soil in farmlands, farmers treat the soil with quick lime, slaked lime or calcium carbonate.

1. True
2. False

Q.

The presence of a base causes tooth decay. True or false?

1. True
2. False

Q. Areas with heavier rainfall will have more ___ soil, while areas with dry climates will have more ___ soil.

1. alkaline, acidic
2. acidic, alkaline
3. basic, acidic
4. basic, alkaline

Q.

Potatoes grow well on Anhad's farm which has soil with a pH of 5.5. Anhad decides to add a lot of lime to the soil so that he can grow broccoli in the same farm :

(a) Do potatoes grow better in the acidic or alkaline soil?

(b) Does broccoli grow better in the acidic or alkaline soil?

Q.

Citrus fruits are acidic in nature, then why are they grown in alkaline soil?

Q.

Assertion: Decay of teeth is due to the decrease in pH in the mouth.

Reason: Acids released slowly destroy the enamel coating which protects teeth.

1. Both assertion and reason are correct and the reason is the correct explanation of the assertion.

2. Both assertion and reason are correct but the reason is not the correct explanation of the assertion.

3. The assertion is correct but the reason is incorrect

4. The assertion is incorrect but the reason is correct

Q. Which of the following is used to neutralise the basic nature of soil?

1. Organic matter
2. Slaked lime
3. Baking soda
4. Quicklime

Q. Soil should have pH around 5.5 to 7.5 to hold most of the nutrient required for plant growth.

1. True
2. False

Q.

What is the benefit of Fluoride content in toothpaste?

Q. Acidity of the soil is of great importance for agriculture. Which of the following plants tolerate a strongly acidic soil and grow well in it?

1. Pineapples
2. Beans
3. Tea
4. Blueberries

Q.

What is the ‘sweetening of soil’? Explain how it is carried out.

Q.

If an acid is added to milk it's ph will reduce forming curd.But is it possible that if a base is added to curd it can form milk back?

Q.

Match Column I with Column II with reference to Haber's process:

$$\begin{array}{ccccc}& ColumnI& & ColumnII& \\ A.& Medicine& p.& AmmoniumNitrate& \\ B.& LaboratoryReagents& q.& AmmoniumSulphate& \\ C.& Fertilizers& r.& AmmoniumSolution& \\ D.& Explosive& s.& AmmoniumCarbonate& \end{array}$$

1. A $⟶$ p; B $⟶$ s; C $⟶$ r; D $⟶$ q

2. A $⟶$ s; B $⟶$ r; C $⟶$ q; D $⟶$ p

3. A $⟶$ p; B $⟶$ s; C $⟶$ r; D $⟶$ q

4. A $⟶$ s; B $⟶$ r; C $⟶$ p; D $⟶$ q

Q. Which of the following is used as a cleaning agent for domestic purposes and for softening hard water?

1. Calcium hydroxide
2. Magnesium hydroxide
3. Sodium carbonate
4. Sodium hydrogen carbonate

Q.

Tulips grow best in soil with a pH range between 6 and 7. If your garden soil has a pH of 4, what should you do before planting tulips? Explain.

Q.

Statement 1: Sodium hydroxide can be used to treat acidity.​

Statement 2 : Mild bases can be used as antacids.

Q. $X$ is used in the manufacture of $Y$ which is used as a disinfectant. What are $X$ and $Y$?

1. Sodium hydroxide, Rayon
2. Ammonium hydroxide, Ammonium phosphate
3. Calcium hydroxide, Bleaching powder
4. None of the above

Q. Due to acid rain, the $pH$ of soil in your backyard will be _____________ .

1. less than 7
2. greater than 7
3. equal to 7
4. equal to or greater than 7

Q. When the soil is too acidic, plants do not grow well in it. Which of the following can be added to neutralise the soil?

Q. Excessive use of fertilizers makes the soil ______ so it should be treated with ______ like ________. If the soil is ____ then the organic matter should be added to it.

1. basic, acids, formic acid, acidic
2. basic, acids, milk of magnesia, neutral
3. acidic, bases, zinc carbonate, neutral
4. acidic, bases, slaked lime, basic