Question

Which of the following will turn blue litmus solution red.

• A. Lime water
• B. Vinegar
• C. Baking Soda solution
• D. Washing Soda solution

Answer 1

The correct option is B

Vinegar

The correct option is (B): Vinegar

Explanation for the correct answer:

Litmus paper:

1. It is basically a kind of filter paper that's actually treated with a lichen-provided natural dye which is just soluble in nature.
2. It is a kind of indicator which is used to test whether the solution is acidic or basic in nature by just changing its color according to the change on the pH values.
3. So, in an Acidic solution the red litmus paper will not change it's color whereas the blue one will change to red.
4. And in basic solution, the red litmus paper will changes it's color to blue whereas the blue one will not change.
5. So as Vinegar is acidic in nature, therefore blue litmus paper will change it's color to red.

Option (A):

Lime water:

1. Lime water means Calcium hydroxide $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$, which is basic in nature.
2. So, there won't be any change of color in blue litmus paper.

Option (C):

Baking Soda solution:

1. Baking Soda solution is basic in nature.
2. Chemical formula of Baking soda: ${\mathrm{NaHCO}}_3$
3. So, there won't be any change of color in blue litmus paper.

Option (D):

Washing Soda solution:

1. Washing Soda solution is also basic in nature.
2. Chemical formula of Washing soda: ${\mathrm{Na}}_2{\mathrm{CO}}_3·10{\mathrm{H}}_2\mathrm{O}$
3. So, there won't be any change of color in blue litmus paper.

Hence, the correct answer is (B): Vinegar