An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. The following statement is true for solution 'A' and 'B'.
An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. The following statement is true for solution 'A' and 'B'.
Options
A has pH greater than 7 and B has pH less than 7.
Marking Scheme
- 11 mark
Analysis & Explanation
The aqueous solution 'A' turns phenolphthalein solution pink, which means it is a strong base. The addition of an aqueous solution 'B' to 'A' makes the pink colour disappear, which means 'B' is an acid. Therefore, 'A' has pH greater than 7 and 'B' has pH less than 7.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2020?
This question carries 1 mark in the CBSE Class 10 Science 2020 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Acids, Bases and Salts" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Acids, Bases and Salts" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2020 paper?
This is a MCQ question from Section A in the CBSE Class 10 Science 2020 paper.