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Question

Strength of an acid solution or a basic solution can be determined by knowing the hydrogen ion concentrations in them, using a pH scale.
(i) Neutral solution has pH 7.
(ii) Acidic solution has pH less than 7.
(iii) Basic solution has pH more than 7.
The pH of a solution is inversely proportional to hydrogen(H+) ion concentration in it.

Teacher told three students Renuka, Bhawna and Seema to test their saliva with pH paper before and after having their lunch. Identify the correct observation from the following.

A
Bhawna observed that pH paper turned red and recorded pH value of 2.3-2.5 after having lunch
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B
Seema observed that pH paper turned yellow and recorded pH value of 5.6 - 5.8 before having lunch
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C
Renuka observed that pH paper turned green and recorded pH value of 7.4- 7.9 before having lunch
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D
Observations made by both Renuka and Seema were correct
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Solution

The correct option is D Observations made by both Renuka and Seema were correct
As we know,
before having lunch saliva have basic nature while after lunch it becomes slight acidic because of HCl formation.
so both Renuka and Seema were correct

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