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Q.

The color change in litmus paper when tested on human blood is: 

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a

Blue to red

b

Red to blue

c

Neither red nor blue

d

Red to maroon

answer is C.

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Detailed Solution

Human blood is a neutral solution. The solutions which do not change the color of either red or blue litmus are known as neutral solutions. 

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The color change in litmus paper when tested on human blood is: