Acids Bases and Indicators Practice Questions

Class 7 · Science · 1108 free MCQs with instant results and detailed explanations.

1108

Total

346

Easy

557

Medium

205

Hard

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Topics in Acids Bases and Indicators

Acid Rain 402

Neutralisation 395

Natural Indicators 311

Sample Questions from Acids Bases and Indicators

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

Which of the following is a natural indicator?

A. Litmus

B. Turmeric

C. Phenolphthalein

D. Methyl Orange

Show Answer & Explanation

Correct Answer: B

Turmeric is a natural indicator that changes color in the presence of acids and bases.

Easy

Which natural indicator is made from red cabbage?

A. Cabbage Juice

B. Beet Juice

C. Onion Extract

D. Ginger Extract

Show Answer & Explanation

Correct Answer: A

Cabbage juice is known to indicate pH changes by changing color.

Easy

What color will red litmus paper turn in a basic solution?

A. Blue

B. Red

C. Green

D. Yellow

Show Answer & Explanation

Correct Answer: A

Red litmus paper turns blue in the presence of a base.

Medium

Which of the following is a natural indicator?

A. Turmeric

B. Methyl orange

C. Phenolphthalein

D. Bromothymol blue

Show Answer & Explanation

Correct Answer: A

Turmeric changes color in the presence of acids and bases, making it a natural indicator.

Medium

Which natural indicator shows a color change in the pH range of 4 to 6?

A. Litmus

B. Red cabbage juice

C. Beetroot

D. Tea

Show Answer & Explanation

Correct Answer: B

Red cabbage juice changes color from red in acidic solutions to green in neutral to basic solutions.

Medium

Which of the following is NOT a property of acids?

A. Taste sour

B. Turn blue litmus red

C. Feel slippery

D. Release hydrogen ions in solution

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Correct Answer: C

Acids do not feel slippery; this property is typically associated with bases.

Medium

A solution turns blue litmus paper red. This indicates that the solution is:

A. Acidic

B. Basic

C. Neutral

D. Both A and B

Show Answer & Explanation

Correct Answer: A

The ability to turn blue litmus red indicates the presence of an acid in the solution.

Hard

Which of the following statements about the use of natural indicators is TRUE?

A. Natural indicators are less effective than synthetic indicators.

B. Natural indicators can be reused multiple times without losing their properties.

C. Natural indicators can only detect pH above 7.

D. Natural indicators often change color in response to pH variations.

Show Answer & Explanation

Correct Answer: D

Natural indicators, such as litmus and turmeric, change color in response to different pH levels, making them useful for determining acidity or alkalinity.

Hard

A student tested a solution using a natural indicator and observed no color change. What can be inferred about the solution?

A. The solution is strongly acidic.

B. The solution is strongly basic.

C. The solution is neutral.

D. The solution is a salt solution.

Show Answer & Explanation

Correct Answer: C

If there is no color change when using a natural indicator, it generally indicates that the solution is neutral, with a pH around 7.

Q10

Hard

Which of the following substances is a natural indicator?

A. Turmeric

B. Vinegar

C. Soap

D. Baking Soda

Show Answer & Explanation

Correct Answer: A

Turmeric changes color in the presence of acidic or basic substances, making it a natural indicator.

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Acids Bases and Indicators — Class 7 Science Practice Questions Online

This page contains 1108 practice MCQs for the chapter Acids Bases and Indicators in Class 7 Science. The questions are organized by difficulty — 346 easy, 557 medium, 205 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.