Indicator Detective: Acids, Bases And Neutrals

Use colour clues to identify unknown solutions

ScienceGrade 10Mixed12 questions24 min

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Section A: Litmus and Natural Indicators · 6 questionsSection B: Universal Indicator and Safe Testing · 6 questions

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Section A: Litmus and Natural Indicators

Predict colour changes for common indicators.

Choose the correct observation.

Question 1

MediumQuestion

Blue litmus turns red in:

Topic: Indicators and Identification · Skill: Write balanced equations for common acid-base reactions

Question 2

MediumQuestion

Red litmus turns blue in:

Topic: Indicators and Identification · Skill: Write balanced equations for common acid-base reactions

Question 3

MediumQuestion

A solution does not change red or blue litmus. It is most likely:

Topic: Indicators and Identification · Skill: Write balanced equations for common acid-base reactions

Question 4

MediumQuestion

Turmeric stain usually turns reddish-brown with:

Topic: Indicators and Identification · Skill: Explain neutralisation reactions

Question 5

AdvancedQuestion

China rose indicator turning green suggests the solution is:

Topic: Indicators and Identification · Skill: Explain neutralisation reactions

What this assignment covers

Practise litmus, natural indicators, universal indicator and safe household-solution testing.

Skills and sections

Write balanced equations for common acid-base reactions, Explain neutralisation reactions, Explain importance of pH in everyday life, Interpret the pH scale from acidic to basic, Choose suitable remedies for excess acidity or basicity

Section A: Litmus and Natural Indicators: 6 questions
Section B: Universal Indicator and Safe Testing: 6 questions