Online Shiksha

By Savita S. More

MCQ on Class 7 Science Acid Base and Salts

Last updated on December 9th, 2023 at 09:07 pm

 

Que: How is turmeric paper created?
a) By applying turmeric paste to filter paper and drying it
b) By applying vinegar to blotting paper and drying it
c) By applying lemon juice to filter paper and drying it
d) By applying baking soda to blotting paper and drying it
Answer: a) By applying turmeric paste to filter paper and drying it

 

Que: What happens to the color of turmeric paper when a drop of soap solution is added?
a) It turns red
b) It turns blue
c) It turns yellow
d) It remains unchanged
Answer: b) It turns blue

 

Que: What is requested from the teacher for further demonstrations?
a) Turmeric powder
b) Soap solution
c) Dilute solutions of various chemicals
d) Blotting paper
Answer: c) Dilute solutions of various chemicals

 

Que: What is introduced as a new indicator for the demonstration?
a) Turmeric powder
b) Soap solution
c) Phenolphthalein
d) Blotting paper
Answer: c) Phenolphthalein

 

Que: What is the initial color of the dilute hydrochloric acid in the test tube?
a) Red
b) Blue
c) Yellow
d) Clear/colorless
Answer: d) Clear/colorless

 

Que: What is added to the acid in the test tube to observe any change in color?
a) Vinegar
b) Turmeric powder
c) Phenolphthalein solution
d) Soap solution
Answer: c) Phenolphthalein solution

 

Que: What is the result when an acidic solution is mixed with a basic solution in suitable amounts?
a) The solution becomes acidic
b) The solution becomes basic
c) The solution becomes neutral
d) The solution becomes concentrated
Answer: c) The solution becomes neutral

 

Que: What happens to the temperature of the reaction mixture during neutralization reactions?
a) It decreases
b) It remains unchanged
c) It increases
d) It fluctuates
Answer: c) It increases

 

Que: What substance is formed during neutralization reactions?
a) Acid
b) Base
c) Salt
d) Water
Answer: c) Salt

 

Que: What is the general equation for neutralization reactions?
a) Acid + Base → Salt + Water (without heat evolution)
b) Acid + Base → Salt + Water (with heat evolution)
c) Acid + Base → Salt + Oxygen (with heat evolution)
d) Acid + Base → Salt + Carbon dioxide (with heat evolution)
Answer: b) Acid + Base → Salt + Water (with heat evolution)

 

Que: Which reaction is given as an example of neutralization?
a) HCl + NaOH → NaCl + H2O
b) H2O + NaCl → HCl + NaOH
c) NaOH + NaCl → HCl + H2O
d) NaCl + H2O → HCl + NaOH
Answer: a) HCl + NaOH → NaCl + H2O

 

Que: What would be the result of adding dilute sulfuric acid to lime water?
a) The reaction mixture becomes acidic
b) The reaction mixture becomes basic
c) The reaction mixture becomes neutral
d) The reaction mixture becomes hot
Answer: d) The reaction mixture becomes hot

 

Chapter  – Class 7 Science  Acids, Bases, and Salts

 

Class 7 Science Textbook Solutions

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

online-shiksha © 2023 Frontier Theme