Last updated on December 9th, 2023 at 09:07 pm
Class 7 Science Acid Base and Salts MCQ
Que: Which substances are considered acidic?
a) Lemon juice, orange juice, curd, and vinegar
b) Baking soda
c) Sugar and salt
d) Milk and water
Answer: a) Lemon juice, orange juice, curd, and vinegar
Que: What taste and texture are associated with baking soda?
a) Sweet and grainy
b) Sour and gritty
c) Bitter and soapy
d) Salty and smooth
Answer: c) Bitter and soapy
Que: What are indicators used for?
a) Determining the color of substances
b) Identifying the taste of substances
c) Testing the pH of substances
d) Changing the texture of substances
Answer: c) Testing the pH of substances
Que: Which of the following is an example of an indicator?
a) Sugar
b) Turmeric
c) Salt
d) Milk
Answer: b) Turmeric
Que: What is litmus commonly used as?
a) A natural dye
b) A cleaning agent
c) A food additive
d) A preservative
Answer: a) A natural dye
Que: What color does litmus turn in distilled water?
a) Red
b) Blue
c) Mauve (purple)
d) Green
Answer: c) Mauve (purple)
Que: What color does litmus turn when added to an acidic solution?
a) Red
b) Blue
c) Green
d) Yellow
Answer: a) Red
Que: What color does litmus turn when added to a basic solution?
a) Red
b) Blue
c) Green
d) Yellow
Answer: b) Blue
Que: How is litmus commonly available for use?
a) As a powder
b) As a liquid
c) As litmus strips or paper
d) As a gel
Answer: c) As litmus strips or paper
Que: What color is litmus paper used to test for acidity?
a) Red
b) Blue
c) Green
d) Yellow
Answer: a) Red
Que: What color is litmus paper used to test for alkalinity?
a) Red
b) Blue
c) Green
d) Yellow
Answer: b) Blue
Que: What happens to litmus paper when it is exposed to a neutral solution?
a) It turns red
b) It turns blue
c) It turns green
d) It remains unchanged
Answer: d) It remains unchanged
Que: What can be used to make turmeric paper?
a) Vinegar
b) Turmeric powder
c) Lemon juice
d) Baking soda
Answer: b) Turmeric powder