1. How can Permanent hardness of water be removed?

2. The Sun City is located in which continent?

3. Which situation makes a firm most efficient?

4. On the shore of which counrty cold currents have cooling effect?

5. Which pioneer was in preaching Nirguna Bhakti in medieval India?

6. Which animal have no blood but they respire?

7. Who is known as the Father of the Indian Constitution?

8. To an observer on the lunar surface, during the day time, how will the sky appear?

9. The important fishing areas called Grand Bank and Georges Bank located in which region?

10. Which lady wrote a historical account during the Mughal Period?

11. Among the SAARC country, which is the most densely populated country?

12. What is the total number of judges of the International Court of Justice (ICJ)?

13. What is known as venus’s flower?

14. Sunda Trench lies in which ocean?

15. Between which the Battle of Khanwa was fought?

16. By which is in In practice the policy of the Government shaped?

17. What is Electromagnetic radiation with maximum wavelength?

18. During which prime minister was the strategy of Rolling plan was adopted?

19. Aravalli ranges are an example of which mountains?

20. Which war was ended by the Treaty of Madras?

1 Answer

Answer :

Answer : 1. By adding washing soda 2. South Africa3. Lowest average costs 4. Peru 5. Ramananda 6. Hydra 7. Dr. B. R. Ambedkar 8. Black 9. North-west Atlantic10. Gulbadan Begam 11. Bangladesh 12. 15 13. Euplectella 14. Indian Ocean 15. Babar and Rana Sanga 16. The Cabinet 17. Radio waves 18. Morarji Desai 19. Residual mountains 20. First Mysore war

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Last Answer : A few methods to remove hardness from water are,Chemical Process of Boiling Hard Water.Adding Slaked Lime (Clark's Process)Adding Washing Soda.Calgon Process.Ion Exchange Process.Using Ion Exchange Resins.

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Description : Permanent - hardness of water may be removed by addition of – (1) Alum (2) Sodium carbonate (3) Lime (4) Potassium Permangante

Last Answer : (2) Sodium carbonate Explanation: Sodium carbonate (also known as washing soda or soda ash) is a sodium salt of carbonic acid. In domestic use, it is used as a water softener in laundering. It ... with the detergent being used. Sodium carbonate can be used to remove grease, oil and wine stains.

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Description : How can Permanent hardness of water be removed?

Last Answer : By adding washing soda

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Description : Extensive deserts occur in the western tropical regions of continents because : (1) of easterly trade winds. (2) cold ocean currents flow along the western coasts. (3) of the effect of both the ... winds and cold ocean currents. (4) the rate of evaporation is greater along the western margin areas.

Last Answer :  of the effect of both the offshore easterly trade winds and cold ocean currents. 

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Last Answer : Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water.

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Description : Which of the following is responsible for permanent hardness of water? (1) magnesium bicarbonate (2) sodium chloride (3) calcium sulphate (4) calcium bicarbonate

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Description : The method that cannot be used for re- moving permanent hardness of water is?

Last Answer : boiling

Description : Permanent hardness of water is due to the presence of which salts

Last Answer : Chlorides and sulphates of Calcium & Magne- sium

Description : Permanent hardness of water can be re- moved by adding?

Last Answer : sodium carbonate or by distillation or by ex- change method

Description : Permanent hardness of water is due to the presence of?

Last Answer : sulphates and chlorides of calcium and magne- sium

Description : Permanent hardness of water is due to the presence of?

Last Answer : bicarbonates of calcium and magnesium

Description : Which compounds are responsible for permanent and temporary hardness of water?

Last Answer : Ans-Permanent hardness is due to chlorides and sulphates of calcium and magnesium While temporary hardness is due to bicarbonates of calcium and magessium.

Description : Which compounds are responsible for permanent hardness of water?

Last Answer : Ans- Chlorides and sulphates of calcium and magnesium

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Last Answer : (B) Sulphates & chlorides

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Last Answer : (A) Ca(HCO3 )2

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