Test Index

BECE Science 2019 Paper

Question : 21

Total: 40

Solution:

Concept:

A neutral substance does not change the colour of either blue or red litmus paper.

Explanation:

HCl is an acid, so it turns blue litmus red.

NaOH and KOH are bases, so they turn red litmus blue.

\mathrm{H_2O}

is neutral, so it does not change the colour of litmus paper.

Answer:

\mathrm{H_2O}

(Option B) is neutral to litmus paper.

Go to Question:

Prev Question

Next Question