Which of the following solution has the lowest pH value?

Question

Question

This question was previously asked in

RRB Group D 26 Sept 2022 Shift 2 Official Paper

Answer 1

The correct answer is 'Tomato juice'.

Key Points

pH-value defines the acidity or basicity of the substance. More the acidic substance lower is the acidic value.
pH-value helps us to know whether the substance is acidic or basic.
Its value ranges from 0-14.
0-6.9 is considered as an acidic substance, 7 is considered as neutral and 7.1 to 14 is considered as basic.
Tomato: Tomato contains two types of acids, these are malic acid and citric acid. Both of them are mild acids. Hence the pH-value of tomato ranges from 3.5-4.7.

Additional Information

The pH of saliva before the meal is about 7.4 which is basic. The pH of saliva after the meal is around 5 .
Coffee does indeed have a pH level, but is not a useful measure of flavor. It would vary depending on brewing method and roast level, but not significantly. Black coffee generally lands around a pH of 5 (acidic, not basic) and milk has a pH of 6 (slightly more neutral).