Hardness of Water, Types, and Units

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Email *

Name of student *

Full Name of College/ Institute *

1. The water which forms good lather with soap or detergent is ___ water. *

1 point

Soft

hard

good

bad

2. Soft water contains *

1 point

Na and k

Na and Ca

K and Ca

Ca and Mg

3. Hard water contains *

1 point

Na and k

Na and Ca

K and Ca

Ca and Mg

4. 1mg/lit= *

1 point

0.07 0Clark

0.01 0Clark

0.1 0Clark

0.7 0Clark

5. Which of the following equation is correct? *

1 point

1ppm = 0.1mg/L = 0.1 degree F = 0.07 degree Clark

1ppm = 1mg/L = 0.1 deree F = 0.07 degree Clark

1ppm = 1mg/L = 0.1 degree F = 0.7 degree Clark

1ppm = 1mg/L = 1 degree F = 0.07 degree Clark

6. Temporary hardness is also called as ___ *

1 point

non carbonate hardness

bicarbonate hardness

non- bicarbonate hardness

carbonate hardness

7. Permanent hardness is also called as ___ *

1 point

non carbonate hardness

bicarbonate hardness

non- bicarbonate hardness

carbonate hardness

8. Which of the following does not cause any hardness in water ? *

1 point

CaCl2

CaCO3

NaCl

MgCCk2

9. Which of the following is/ are the temporary hardness causing substance/s *

1 point

Ca(HCO3)2

MgCl2

CaCl2

CO2

10. Which of the following salt is not responsible for hardness in water? *

1 point

Ca(HCO3)2

MgCl2

CaCl2

NaCl

11. Which type of hardness MgSO4 gives in the water? *

1 point

Temporary

easy

permanent

hard

12. As water evaporates in the boiler, the concentration of sodium carbonates increases *

1 point

True

False

13. Na2CO3 + H2O = 2NaOH + CO . The rection is __ *

1 point

True

False

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