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201.

The temporary hardness due to calcium bicarbonates can be removed by

A.	boiling	B.	lime process
C.	lime-soda process	D.	zeolite process

202.

The permanent hardness of water can be removed by

A.	adding alum	B.	adding chlorine
C.	boiling	D.	zeolite process

203.

By lime soda process, hardness can be reduced to less than

A.	50 ppm	B.	75 ppm
C.	100 ppm	D.	150 ppm

204.

By base exchange method, water of zero degree hardness can be obtained.

Yes

205.

The lime soda process of water softening

A.	requires less quantity of coagulant	B.	helps in kolling pathogenic bacterias
C.	is suitable for turbid and acidic water	D.	all of these

206.

Zeolite is

A.	hydrated silica	B.	sodium silicate
C.	dehydrated calcium silicate	D.	none of these

207.

In Zeolite process

A.	no sludge is formed	B.	water of varying quality can be treated
C.	ferrous and manganese from water are removed	D.	all of tha above

208.

Zeolite process is also known as

A.	base exchange process	B.	Cation exchange process
C.	both (a) and (b)	D.	none of these

209.

In lime soda process, the pH value of treated water is increased.

True

False

210.

The acration of water is done to remove

A.	colour	B.	odour
C.	taste	D.	all of these