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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
For question two statements are given$-$one labelled
Assertion $(A)$ and the other labelled
Reason $(R).$ Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below:
Assertion: Higher the $H+$ ion concentration, lower is the $pH$ value.
Reason: The pH of a neutral solution $= 7$, that of a basic solution$< 7$ and that of an acidic solution$> 7.$
  • A
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • ✓
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.
✓

Answer

Correct option: C.
$A$ is true, but $R$ is false.
Higher the $H^+$ ion concentration, lower is the $pH$ value. The $pH$ value less than $7$ represents an acidic solution and value more than $7$ represents a basic solution.

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