Page 61 - CT&AI_CLasa_7_Part_1

Exploring

Substances: Acidic,

2 Basic, and Neutral

computational thinking quest

Tick ( ) the correct option.
1. A student observes that a liquid turns blue What do the red colour in test tube A and the
litmus paper red. Without knowing its name, green colour in test tube B indicate?
how should the student classify it? (Abstract Thinking)
(Abstract Thinking)
(a) B is an acid and A is a base.
(a) Base (b) Neutral
(b) A is an acid and B is a base.

(c) Acid (d) Salt
(c) Both A and B are acids.
2. If a substance shows no change with any
indicator, what can we conclude? (d) Both A and B are bases.
(Abstract Thinking) 4. Observe the pattern:

(a) It is acidic. Lemon Acidic
Soap Basic
(b) It is basic. Sugar solution ? (Pattern Recognition)

(c) It may be neutral. (a) Acidic

(d) It is harmful. (b) Basic
3. A student performed an experiment to (c) Neutral
identify the nature of two solutions using a
red rose indicator and obtained the results (d) Both acidic and basic
shown in the image below. 5. Observe the pattern:

Lemon juice Citric acid
Vinegar Acetic acid
Curd X

A B What does 'X' represents?
(Pattern Recognition)

(a) Oxalic acid (b) Tartaric acid

(c) Lactic acid (d) Citric acid

Exploring Substances: Acidic, Basic, and Neutral 59