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Tests for Acids and Bases Quiz 1 (Form 1, Chemistry)
 

Tests for Acids and Bases Quiz 1 (Form 1, Chemistry)Online version

Quick true/false: indicators and colors in acids, bases, and neutrals.

by YAKILI LMS
1

Phenolphthalein is colorless in acidic solutions and pink in bases.

2

A neutral solution has a pH close to 7.

3

Some indicators show different color ranges for acids and bases.

4

Indicators do not work in liquid form.

5

Litmus paper is not affected by pH.

6

A solution with pH 2 is strongly acidic and can turn methyl orange red.

7

A neutral solution will always show the same color with all indicators.

8

A base often gives blue or green colors with some indicators.

9

Red litmus turns red in acid and blue in base.

10

Natural indicators can be made from red cabbage or beetroot.

11

Red cabbage indicator only works in acidic solutions.

12

The color of an indicator in a neutral solution can depend on the indicator.

13

The colors of indicators depend on the pH of the solution.

14

Universal indicator always shows the color red.

15

Some indicators, such as phenolphthalein, are colorless in acid and pink in base.

16

Some indicators cannot detect pH changes.

17

Indicator colors change as pH changes in a solution.

18

The color change of an indicator helps judge whether a solution is acidic or basic.

19

Methyl orange is blue in acidic solutions.

20

Phenolphthalein is colorless in acidic solutions.

21

Red cabbage juice can be used as a natural indicator.

22

Universal indicator changes color across a pH scale.

23

Thymol blue changes from blue to red in acidic solutions.

24

Certain indicators have pH transition ranges around mid-range values like 4–10.

25

Indicators in liquid form work similarly to paper indicators.

26

Methyl orange turns yellow in basic solutions.

27

A solution with pH 9 is basic and may change thymol blue toward blue.

28

In acids, many indicators show warmer colors such as red or pink.

29

A universal indicator provides several colors as pH changes.

30

Indicator tests become safer when solutions are diluted.

31

Phenolphthalein turns pink in basic solutions.

32

Litmus paper turns blue in basic solutions.

33

Litmus paper turns red in acidic solutions.

34

The color of the indicator can help compare two solutions.

35

Litmus is a natural dye obtained from lichens.

36

A color change of an indicator indicates whether a solution is acidic or basic.

37

Methyl orange is yellow in basic solutions.

38

The pH scale ranges from 0 to 14.

39

Blue litmus turns blue in base and red in acid.

40

Phenolphthalein turns blue in acid.

41

Methyl orange is red in acidic solutions.

42

Blue litmus turns red in base.

43

Indicator colors are used in laboratories to quickly judge pH.

44

Phenolphthalein remains colorless in basic solutions.

45

Red onion skins can provide a plant-based indicator solution.

46

Red cabbage extract can be prepared as a universal indicator for a wide pH range.

47

Lemon juice is a universal indicator and turns all solutions blue.

48

Beetroot juice can be used as a natural pH indicator by observing color changes with acids and bases.

49

Extraction of plant indicators requires heating to 100°C for 2 hours.

50

The extraction process involves chopping plant material, soaking in water, and filtering to obtain a dye.

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