Exploring Substances Acidic Basic and Neutral Class 7 MCQ Science Chapter 2

By tackling these Class 7 Science MCQ and Exploring Substances Acidic Basic and Neutral Class 7 Science Curiosity Chapter 2 MCQ Online Test with Answers, students will build a solid foundation in the topic.

Class 7 Science Chapter 2 Exploring Substances Acidic Basic and Neutral MCQ

Exploring Substances Acidic Basic and Neutral MCQ

Class 7 Science Chapter 2 MCQ Online Test

Question 1.
What is the nature of the substances which changes red litmus paper into blue?
(a) Acidic
(b) Basic
(c) Neutral
(d) All of the above
Answer:
(b) Basic

Question 2.
What will be the effect of lemon juice on blue litmus paper?
(a) Turn it blue
(b) Turn it red
(c) No change will be seen
(d) Turn it green
Answer:
(b) Turn it red

Question 3.
What is the nature of baking soda?
(a) Basic
(b) Acidic
(c) Neutral
(d) None of the above
Answer:
(a) Basic

Question 4.
Which kind of substances arc identified with turmeric paper?
(a) Acidic
(b) Basic
(c) Neutral
(d) All of the above
Answer:
(b) Basic

Question 5.
In which colour, red rose extract changes in acidic medium?
(a) Green
(b) Yellow
(c) Blue
(d) Red
Answer:
(d) Red

Question 6.
What is the reaction called, when bases are mixed in any acidic solution?
(a) Neutralisation
(b) Distillation
(c) Decomposition
(d) Condensation
Answer:
(a) Neutralisation

Question 7.
Which colour is given by red rose extract in basic medium?
(a) Red
(b) Yellow
(c) Green
(d) Blue
Answer:
(c) Green

Question 8.
What is the taste of acidic solution, generally?
(a) Sweet
(b) Bitter
(c) Sour
(d) Salty
Answer:
(c) Sour

Question 9.
In which situation, yellow colour of turmeric turns red?
(a) In acidic solution
(b) In basic solution
(c) In neutral solution
(d) In water
Answer:
(b) In basic solution

Question 10.
Due to presence of which acid, vinegar is acidic?
(a) Citric acid
(b) Acetic acid
(c) Hydrochloric acid
(d) Lactic acid
Answer:
(b) Acetic acid

Question 11.
Why pain is felt on ant bites?
(a) It release basic liquid
(b) It release water
(c) It release poisonous gas
(d) It release acidic liquid
Answer:
(d) It release acidic liquid

Question 12.
What can be applied to neutralise the acidic effect of ant bites?
(a) Lemon juice
(b) Baking soda solution
(c) Vinegar
(d) Sugar solution
Answer:
(b) Baking soda solution

Question 13.
What is added to fix basic soil?
(a) Lime water
(b) Compost/organic substances
(c) Baking soda
(d) Vinegar
Answer:
(b) Compost/organic substances

Question 14.
What is added to fix acidic soil?
(a) Vinegar
(b) Baking soda
(c) Lime water
(d) Rose-extract
Answer:
(c) Lime water

Question 15.
What is the reason behind formation of bubbles when vinegar is splitted on eggshells?
(a) Gas formation (CO₂)
(b) Vapourisation of water
(c) Disolution of CaCO₃
(d) None of them
Answer:
(a) Gas formation (CO₂)

Exploring Substances Acidic Basic and Neutral Class 7 Fill in the blanks

Question 1.
Substances that turn blue litmus paper to red are ______ in nature.
Answer:
acidic

Question 2.
Yellow colour of turmeric turns red/brown in _____ solution.
Answer:
basic

Question 3.
Lemon juice is of ______ nature.
Answer:
acidic

Question 4.
An ant bite causes pain in skin because it releases ______ acid.
Answer:
formic

Question 5.
Red rose extract turns into ______ colour in acidic solution.
Answer:
red

Question 6.
Baking soda solution is of ______ nature.
Answer:
basic

Question 7.
______ is added to fix acidic soil.
Answer:
basic

Question 8.
______ is added to fix basic soil.
Answer:
Organic matter/Compost

Exploring Substances Acidic Basic and Neutral Class 7 True or False

Question 1.
Acidic substances turns blue litmus into red. (True/False)
Answer:
True

Question 2.
Soap solution is of acidic nature. (True/False)
Answer:
False

Question 3.
Turmeric paper changes its colour in acidic solution. (True/False)
Answer:
False

Question 4.
Red rose extract turns green in basic medium. (True/False)
Answer:
True

Question 5.
Applying baking soda on ant bites relieves pain. (True/False)
Answer:
True

Exploring Substances Acidic Basic and Neutral Class 7 Match the following

Question 1.

Column A (Substance)	Column B (Nature)
1. Lemon juice	(a) Basic
2. Baking soda	(b) Neutral
3. Sugar solution	(c) Acidic
4. Lime water	(d) Basic

Answer:

Column A (Substance)	Column B (Nature)
1. Lemon juice	(c) Acidic
2. Baking soda	(d) Basic
3. Sugar solution	(b) Neutral
4. Lime water	(a) Basic