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71.

Refractometer works on the principle of

A.	polarisation of light	B.	change of angle of refraction with composition
C.	change of the electrical donductivity of solution with composition	D.	change of the electrical conductivity of solution with temperature

72.

Polarimeter works on the principle of

A.	polarisation of light	B.	change of the electrical conductivity of solution with composition
C.	change of angle of refraction with composition	D.	change of electrical conductivity of solution with temperature

73.

Polarimeter is used for the analysis of

A.	any liquid solution	B.	sugars and chemicals having symmetrical structures
C.	any solid	D.	any gaseous mixture

74.

Conductivity meter works on the principle of

A.	change of angle of refraction with composition	B.	polarisation of light
C.	change of electrical conductivity of solution with composition	D.	change of electrical resistance with temperature.

75.

The units of specific conductance are

A.	ohm/cm	B.	mho/cm
C.	ohm-cm	D.	mho-cm

76.

Specific conductance in micro-mho/cm of a good quality distilled water is

A.	0.01	B.	0.1
C.	1	D.	10

77.

Specific conductance in micro-mho/cm of a excellent quality raw water is

A.	100	B.	1000
C.	10	D.	0.01

78.

If a solution has pH = 2. it is

A.	highly acidic	B.	weakly acidic
C.	neutral	D.	alkaline

79.

At room temperature [H+] [OH-] is equal to

A.	10-7 moles/litre	B.	10-14 moles/litre
C.	10-10 moles/litre	D.	10-16 moles/litre

80.

If [OH-] = 10-6 moles/litre its pH is

A.	6	B.	8
C.	12	D.	3