Question

which of the following turn ph paper red?a)milk of magnesia b)baking soda c)oxalic acid d)nacl solution​

Answer 1

Answer:

NaCl solution..........

Answer 2

Oxalic acid turns the pH paper red. (option C)

- There are three main colours of pH paper :

1) Red, which means acidic.

2) Green, which means neutral.

3) Blue,which means alkaline.

- So,an acidic substance will produce the red colour of the pH paper.

- And among the four options mentioned in the question,the oxalic acid has the most acidic property. (pH value around 4)