A,B,C and D are four 100-mlL samples of ...

A,B,C and D are four 100-mlL samples of water. Fluoride ion concentrations in these samples are 2, 5, 8 and 12 ppm respectively. One drop of alizarine - S dye is added to each of these samples. The order of intesity of pink colour in these water samples is

A

`A gt B gt C gt D`

B

`D gt C gt B gt A `

C

` A lt B = C lt D`

D

`A= B =C=D`

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The correct Answer is:

A

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