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Class 10 Chemistry Water Explain the methods of removing permanent hardness.


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Explain the methods of removing permanent hardness.

7. Which one of the following salts makes the water permanently hard?a. \mathrm{Na}_{2} \mathrm{CO}_{3} b. \mathrm{NaHCO}_{3} c. \mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2} d. \mathrm{CaSO}_{4}
7. Which one of the following salts makes the water permanently hard?a.  \mathrm{Na}_{2} \mathrm{CO}_{3} b.  \mathrm{NaHCO}_{3} c.  \mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2} d.  \mathrm{CaSO}_{4}

7. Which one of the following salts makes the water permanently hard?a. \mathrm{Na}_{2} \mathrm{CO}_{3} b. \mathrm{NaHCO}_{3} c. \mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2} d. \mathrm{CaSO}_{4}

10. What is the difference between biodegradable and non-biodegradable substances?
10. What is the difference between biodegradable and non-biodegradable substances?

10. What is the difference between biodegradable and non-biodegradable substances?

2. Specific heat capacity of water is:a. 4.2 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} b. 4.2 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1} c. 2.4 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} d. 2.4 \mathrm{Jg}^{-1} \mathrm{~K}^{-1}
2. Specific heat capacity of water is:a.  4.2 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} b.  4.2 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1} c.  2.4 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} d.  2.4 \mathrm{Jg}^{-1} \mathrm{~K}^{-1}

2. Specific heat capacity of water is:a. 4.2 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} b. 4.2 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1} c. 2.4 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} d. 2.4 \mathrm{Jg}^{-1} \mathrm{~K}^{-1}

16. The chemicals used to kill or control pests are called pesticides. They are:a. dangerous inorganic chemicals.b. dangerous organic chemicals.c. beneficial inorganic chemicals.d. beneficial organic chemicals.
16. The chemicals used to kill or control pests are called pesticides. They are:a. dangerous inorganic chemicals.b. dangerous organic chemicals.c. beneficial inorganic chemicals.d. beneficial organic chemicals.

16. The chemicals used to kill or control pests are called pesticides. They are:a. dangerous inorganic chemicals.b. dangerous organic chemicals.c. beneficial inorganic chemicals.d. beneficial organic chemicals.

7. What are the causes of hardness in water?
7. What are the causes of hardness in water?

7. What are the causes of hardness in water?

11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid
11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid

11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid

11. How detergents make the water unfit for aquatic life?
11. How detergents make the water unfit for aquatic life?

11. How detergents make the water unfit for aquatic life?

Explain five important waterborne diseases. How can these be prevented?
Explain five important waterborne diseases. How can these be prevented?

Explain five important waterborne diseases. How can these be prevented?

1. How water rises in plants?
1. How water rises in plants?

1. How water rises in plants?

13. Which one of the following ions does not cause hardness in water?a. \mathrm{Ca}^{2+} b. \mathrm{Mg}^{2+} c. \mathrm{SO}_{4}^{2-} d. \mathrm{Na}^{+}
13. Which one of the following ions does not cause hardness in water?a.  \mathrm{Ca}^{2+} b.  \mathrm{Mg}^{2+} c.  \mathrm{SO}_{4}^{2-} d.  \mathrm{Na}^{+}

13. Which one of the following ions does not cause hardness in water?a. \mathrm{Ca}^{2+} b. \mathrm{Mg}^{2+} c. \mathrm{SO}_{4}^{2-} d. \mathrm{Na}^{+}

2. Which forces are responsible for dissolving polar substances in water?
2. Which forces are responsible for dissolving polar substances in water?

2. Which forces are responsible for dissolving polar substances in water?

What is water pollution? Describe the effects of using polluted water.
What is water pollution? Describe the effects of using polluted water.

What is water pollution? Describe the effects of using polluted water.

Explain the methods of removing permanent hardness.
Explain the methods of removing permanent hardness.
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Explain the methods of removing permanent hardness.

Write a note on the treatment of sewage water.
Write a note on the treatment of sewage water.

Write a note on the treatment of sewage water.

6. Differentiate between soft and hard water.
6. Differentiate between soft and hard water.

6. Differentiate between soft and hard water.

9. Mention the disadvantages of detergents.
9. Mention the disadvantages of detergents.

9. Mention the disadvantages of detergents.

8. What are the effects of temporary hardness in water?
8. What are the effects of temporary hardness in water?

8. What are the effects of temporary hardness in water?

Justify the statement: household water is the reason of water pollution.
Justify the statement: household water is the reason of water pollution.

Justify the statement: household water is the reason of water pollution.

8. Rapid growth of algae in water bodies is because of detergent havinga. carbonate salts.b. sulphonic acid salts.c. sulphate salts.d. phosphate salts.
8. Rapid growth of algae in water bodies is because of detergent havinga. carbonate salts.b. sulphonic acid salts.c. sulphate salts.d. phosphate salts.
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8. Rapid growth of algae in water bodies is because of detergent havinga. carbonate salts.b. sulphonic acid salts.c. sulphate salts.d. phosphate salts.

How polarity of water molecule plays its role to dissolve the substances?
How polarity of water molecule plays its role to dissolve the substances?
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How polarity of water molecule plays its role to dissolve the substances?

13. What are the reasons of waterborne diseases?
13. What are the reasons of waterborne diseases?
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13. What are the reasons of waterborne diseases?

12. Why are pesticides used?
12. Why are pesticides used?
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12. Why are pesticides used?

15. Ionic compounds are soluble in water due to:a. hydrogen bonding.b. ion-dipole forces.c. dipole-dipole forces.d. dipole-induced dipole forces.
15. Ionic compounds are soluble in water due to:a. hydrogen bonding.b. ion-dipole forces.c. dipole-dipole forces.d. dipole-induced dipole forces.
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15. Ionic compounds are soluble in water due to:a. hydrogen bonding.b. ion-dipole forces.c. dipole-dipole forces.d. dipole-induced dipole forces.

3. Why are non-polar compounds insoluble in water?
3. Why are non-polar compounds insoluble in water?
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3. Why are non-polar compounds insoluble in water?

5. How does limestone dissolve in water?
5. How does limestone dissolve in water?
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5. How does limestone dissolve in water?

Explain that agricultural effluents are fatal for aquatic life.
Explain that agricultural effluents are fatal for aquatic life.
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Explain that agricultural effluents are fatal for aquatic life.

14. How waterborne diseases can be prevented?
14. How waterborne diseases can be prevented?
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14. How waterborne diseases can be prevented?

1. Which one of the following properties of water is responsible for rising of water in plants?a. specific heat capacityb. surface tersionc. excellent solvent actiond. capillary action
1. Which one of the following properties of water is responsible for rising of water in plants?a. specific heat capacityb. surface tersionc. excellent solvent actiond. capillary action
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1. Which one of the following properties of water is responsible for rising of water in plants?a. specific heat capacityb. surface tersionc. excellent solvent actiond. capillary action

10. Which one of the following diseases causes liver inflammation?a. typhoidb. jaundicec. cholerad. hepatitis
10. Which one of the following diseases causes liver inflammation?a. typhoidb. jaundicec. cholerad. hepatitis
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10. Which one of the following diseases causes liver inflammation?a. typhoidb. jaundicec. cholerad. hepatitis

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