Question

10) To test nitric acid we must use _____ litmus paper. a) red b) blue c) both a and b d) none of these

Answer 1

Answer:

blue

Explanation:

Acid turns blue litmus red. Nitric acid is an acid, thus it turns blue litmus into the red.

Answer 2

Answer:

c)

because in acid if we use blue litmus then it will turn into red and if we use red litmus then it will not change .

from this I can know the solution is acid.