Question

what is the blue and red litmus ??
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Answer 1

Answer:

if litmus change it's colour in blue means base and litmus change it's colour in red means chemical

Answer 2

Blue Litmus and Red Litmus: It is a one type of substance which we get from Lichens It's actual colour is purple.. It is used for The test of the given substance is acid or base

If the given substance is base The litmus paper turns into red to blue

If the given substance ia acid The litmus paper turns into blue to red