Acids, Bases and Salts Quiz CBSE/Science/Class7
  • 1. Which is not a property of acids?
A) Acids do not change the colour of turmeric indicator.
B) Acids turn blue litmus red.
C) With china rose indicator, these give dark pink colour.
D) These are sour to taste.
E) Acids turn red litmus blue.
  • 2. Which is not a property of bases?
A) Bases do not change the colour of red litmus.
B) Bases give green colour with china rose indicator.
C) Bases turn the colour of turmeric indicator to red.
D) These are bitter to taste.
E) Bases do not change the colour of blue litmus.
  • 3. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
A) Neutral
B) None of the above
C) Basic
D) Acidic
  • 4. Is the distilled water acidic/basic/neutral?
A) None of the above
B) Acidic
C) Neutral
D) Basic
  • 5. Nitric acid turns red litmus blue.
A) True
B) False
C) None of the above
  • 6. Indicator is a substance which shows different colours in acidic and basic solutions.
A) False
B) True
C) None of the above
  • 7. Tooth decay is caused by the presence of a base.
A) True
B) False
C) None of the above
  • 8. An antacid tablet contains
A) Acid
B) Base
C) None of the above
  • 9. Milk of magnesia contains
A) None of the above
B) Acid
C) Base
  • 10. Calamine solution is applied on the skin when an ant bites. It is
A) Acidic
B) None of the above
C) Basic
  • 11. Factory wastes contain
A) None of the above
B) Bases
C) Acids
  • 12. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution?
A) Acidic
B) Basic
C) Either basic or neutral in nature
D) None of the above
  • 13. Which of these statement is correct?
A) Change of colour in an acid and a base depends on the type of the indicator.
B) None of the above
C) If an indicator changes colour with a base, it does not change colour with an acid.
D) Both acids and bases change colour of all indicators.
E) If an indicator gives a colour change with an acid, it does not give a change with a base.
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