Question

Unit -I Water and its treatment


1.Which indicator is used in EDTA method ,while estimating permanent and temporary hardness of water


a) Phenolphthalein

b) Methly orange

c) Diphenylamine

d) Eriochrome black t


2.In zeolite/permutit method which chemical is used to regenerate sodium permutit


a) Calcium chloride

b) Sodium chloride

c) Magnesium chloride

d) Aluminium chloride


3.What is the trade name of complex salt which is used in
Calogon’s process


a) Potassium ferrocyanide

b) Tetraamino cupric sulphate

c) Potassium ferricyanide

d) Sodium hexameta phosphate


4.Which type of impurity is not present in natural water


a) Dissolved impurity

b) Suspended impurity

c) Colloidal impurity

d) Emulsion impurity


5.Hardness of water is due to presence of following salts


a) Calcium bicarbonate

b) Magnesium sulphate

c) Calcium chloride

d) All of the above


6.Temporary hardness is due to the presence of


a) Calcium sulphate

b) Magnesium sulphate

c) Calcium chloride

d) Calcium bicarbonate


7.In paper industry presence of which type compunds in water as a impurity effect the color of paper


a) Iron compunds

b) Aluminium compounds

c) Sodium compunds

d) Magnesium compounds


8.when impure water is used in sugar refineries what bad effect it causes in sugar


a) Sugar does not crystallises well

b) Sugar becomes deliquescent

c) Sugar decomposes while keeping in storage

d) All of the above


9.which of the following is a colloidal impurity present in water


a) Bacteria

b) Mud

c) Algae

d) Fungi


10.In bakeries, presence of which matter in water is harmful by affecting the action of yeast


a) Inroganic matter

b) Organic matter

c) Physical matter

d) Analytical matter


11.In textile industry presence of which impurity spots the fabric


a) Iron and manganese

b) Sodium amd magnesium

c) Aluminium and sodium

d) Calcium and magnesium


12.Permanent hardness in water is due to presence of


a) Calcium bicarbonate

b) Magnesium bicarbonate

c) Sodium chloride

d)Magnesium sulphate


13.which of the following is the suspended type of impurity presence in water


a) Organic matter

b) Vegetable and animal matter

c) Industrial waste

d) All of the above


14.In natural water the dissolved type of impurities consist of


a) Mineral salts and gases

b)Algae

c) Bacteria

d) Organic matter


15.In Clark’s method which chemical is used for removing hardness in water


a) Sodium chloride

b) Lime

c) Bleaching powder

d) Plaster of paris


16.In ion exchange method which type of resin has been used


a) Only acidic resin

b) Only basic

c) Acidic and basic both

d) Polyester resin


17.what will be TDS count in distilled water


a) 250 ppm

b) 500 ppm

c) 0 ppm

d) 100 ppm


18.In estimation of hardness of water by EDTA method which buffer is added while doing the analysis


a) Ammonium hyrdoxde and ammonium chloride

b) Acetic acid and sodium acetate

c) Boric acid and sodium borax

d) Carbonic acid and sodium bicarbonate


19.what is the advantage of Calogon’s method when its used
in boiler-feed water

a) It dissolves impurites of copper and iron compounds

b) It dissolves scale formed in boiler plates

c) It prevents boiler plates from corrosion

d) All of the above


20.which method is used for removing temporary hardness in water in domestic scale


a) Clark’s method

b) Boiling method

c) Zeolite method

d) Ion exchange method

​

Answer 1

Answer:

1. b

2. d

3.a

4.b

5. c

6.a

7.d

8.a

9.a

10. d

11. c

12. b

13. d

14. c

15. a

16. d

17 . b

18. a

19. d

20. b

I think is right