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91.

The product of H+ ions and OH- ions in a water solution is equal to

A.	0	B.	10?1
C.	10?7	D.	10?14

92.

The maximum acidity in water will occur at a pH value of

A.	0	B.	2
C.	7	D.	14

93.

The most common cause of acidity in water is

A.	hydrogen	B.	oxygen
C.	carbon dioxide	D.	all of these

94.

When the pH value of water is

A.	equal to 7	B.	less than 7
C.	more than 7

95.

When the pH value of water is more than 7, it represents

A.	neutal	B.	acidic
C.	alkaline

96.

The alkalinity in water is caused by

A.	sodium carbonate	B.	potassium carbonate
C.	calcium hydroxide	D.	all of these

97.

The maximum permissible chlorine content for public supplies should be between

A.	0.1 to 0.2 ppm	B.	0.3 to 0.4 ppm
C.	1.2 to 4 ppm	D.	6.5 to 8 ppm

98.

The maximum permissible quantity of iron and manganese in water for domestic purposes should be

A.	0.1 ppm	B.	0.3 ppm
C.	0.6 ppm	D.	0.8 ppm

99.

The pH value of water for public supplies is limited from

A.	2.5 to 6.5	B.	6.5 to 8
C.	8 to 10.5	D.	10.5 to 15

100.

The quantity of arsenic in water for domestic purposes should not be more than 0.05 ppm.

True

False