Question 31 markMCQSection A

$The following table shows the pH values of four solutions A, B, C and D on a pH scale. The solutions A, B, C and D respectively are of a$

Q: The following table shows the pH values of four solutions A, B, C and D on a pH scale. The solutions A, B, C and D respectively are of a

Weak acid, neutral, weak base, strong base

Chemical Reactions and Equations

pH scale

Options

(A)

Strong acid, weak acid, neutral, strong base

(B)

Weak acid, neutral, weak base, strong base

(C)

Weak acid, neutral, strong base, weak base

(D)

Weak acid, neutral, strong base, strong acid

Official answer

Weak acid, neutral, weak base, strong base

pH scale

acidic

neutral

basic

Marking scheme

1. $pH scale$
2. $acidic$
3. $neutral$
4. $basic$

Hint

$Use the pH scale to determine the nature of each solution.$

Quick oral answer

$The pH scale is a measure of the concentration of hydrogen ions in a solution. A pH of 7 is neutral, while a pH less than 7 is acidic and a pH greater than 7 is basic. Based on the pH values given in the table, we can determine the nature of each solution. Solution A has a pH of 4, which is acidic. Solution B has a pH of 7, which is neutral. Solution C has a pH of 9, which is basic. Solution D has a pH of 12, which is also basic. Therefore, the correct order of the solutions is weak acid, neutral, weak base, strong base.$

Common mistakes

1. $confusing pH values with acidity/basicity$
2. $not using the pH scale correctly$

Analysis and explanation

The pH scale is a measure of the concentration of hydrogen ions in a solution. A pH of 7 is neutral, while a pH less than 7 is acidic and a pH greater than 7 is basic. Based on the pH values given in the table, we can determine the nature of each solution. Solution A has a pH of 4, which is acidic. Solution B has a pH of 7, which is neutral. Solution C has a pH of 9, which is basic. Solution D has a pH of 12, which is also basic. Therefore, the correct order of the solutions is weak acid, neutral, weak base, strong base.

Interesting facts

$The pH scale was developed by Søren Sørensen in 1909.$

$The pH scale is used to measure the acidity/basicity of solutions.$

Question details

Q3 of 39 questions

Board: CBSE
Class: Class 10
Subject: Science
Year: 2025
Section: Section A
Marks: 1
Type: MCQ
Chapter: Chemical Reactions and Equations
Topic: $pH scale$
Bloom's level: Knowledge
Syllabus topic: $Acids and Bases$

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Frequently asked questions

$How many marks does this question carry in CBSE Class 10 Science 2025?$

$This question carries 1 mark in the CBSE Class 10 Science 2025 examination.$

$Which chapter does this question come from in Science?$

$This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.$

$What topic does this question cover in Science?$

$This question covers the topic "pH scale" from CBSE Class 10 Science.$

$What type of question is this in the CBSE Class 10 Science 2025 paper?$

$This is a MCQ question from Section A in the CBSE Class 10 Science 2025 paper.$