CBSE Questions for Class 7 Chemistry Acids Bases And Salts Quiz 1 - MCQExams.com

An indicator which changes its colour from blue to red in acids is litmus solution.
  • True
  • False
China rose indicator turns basic solution to:
  • yellow
  • orange
  • magenta
  • green
The natural indicator litmus is extracted from:
  • beetroot
  • china rose
  • lichens
  • turmeric
Which one will change from red litmus to blue?
  • $$NaCl$$
  • $$HCl$$
  • $$KOH$$
  • $$LiOH$$
Which of the following acid is present in the sting of an ant?
  • Oxalic acid
  • Succinic acid
  • Tartaric acid
  • Formic acid
State whether the statement is true or false:
Fizzy drinks are basic.
  • True
  • False
Bases are soapy to touch.
  • True
  • False
The word acid comes from the Latin word acere.
  • True
  • False
In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations:

Sample takenpH paper color turned to
I. WaterBlue
II. Dilute HClRed
III. Dilute NaOHBlue
IV. Dilute Ethanoic acidOrange


Which one of the above observations is incorrect?
  • I
  • II
  • III
  • IV
Acids and bases are important because of :
  • their use in industry
  • their effects on human health
  • their effects on farmer's crops
  • their use in neutralization to form salts
Which acids/ bases are used for the following?
(i) To neutralize sting of wasps
(ii) In alkaline batteries
(iii) Manufacturing of soap
  • (i) $$CH_3CHO$$ (ii) $$CsOH$$ (iii) $$Ca(OH)_2$$
  • (i) $$CH_3COOH$$ (ii) $$CuSO_4$$ (iii)$$ Ba(OH)_2$$
  • (i) $$CH_3COOH$$ (ii) $$KOH$$ (iii)$$ NaOH$$
  • None of these
What happens when blue litmus paper is dipped into chlorine water?
  • Paper becomes red
  • Paper becomes white
  • Paper remains blue
  • Paper dissolves
Hydrogen chloride gas turns the blue litmus paper:
  • green
  • red
  • black
  • no change in colour
A drop of a liquid sample was put on the pH paper. The color of the pH paper turned blue. The liquid sample could be that of:
  • Lemon juice
  • Hydrochloric acid
  • Sodium bicarbonate solution
  • Ethanoic acid
An alkali used for removing grease stains is:
  • $$ HCl$$
  • $$ Al(OH)_3$$
  • $$ NH_4OH$$
  • $$ Na_2SO_4$$
______ turns red litmus to blue.
  • Acid
  • Base
  • Both of A and B
  • None of A or B
Antacids contain ___________.
  • weak base
  • weak acid
  • strong base
  • strong acid
$$X+H_2O\rightarrow Y$$. 
$$Y$$ is used to remove grease stains from woollen clothes. Identify $$X$$ and $$Y$$.
  • $$X=HCl,  Y=NaOH$$
  • $$X=NH_4OH,  Y=NH_3$$
  • $$X=NH_3,  Y=NH_4OH$$
  • None of these
The indicator used in the titration of a strong acid and a strong base is/are :
  • phenolphthalein
  • methyl orange
  • alizarin yellow
  • red litmus
Which of the following is a property of a base ?
  • They taste bitter.
  • They feel soapy when touched.
  • They turn red litmus blue.
  • All of the above.
On washing with soap, a turmeric stain on the cloth turns to red because
A. soap solution is alkaline.
B. soap solution is acidic.
C. turmeric contains a natural indicator.
D. turmeric contain litmus.
Select the correct alternative.
  • A and C
  • B and D
  • C and B
  • A and D
Acids are:
  • sour
  • corrosive
  • turns blue litmus red
  • All of the above
Which one of the following types of medicines is for treating indigestion ? 
  • Antibiotic
  • Analgesic
  • Antacid
  • Antiseptic
The two kinds of litmus paper are:
  • blue and red
  • blue and yellow
  • red and green
  • yellow and red
What could be the substance X?
  • Acid
  • Base
  • Water
  • None of these
Manisha took a little bit of soil from her garden and mixed it with water. When she dipped a blue litmus in it, the litmus turned red. By adding which of the following to her garden will she get better plant growth?
  • Hydrochloric acid
  • Slaked lime
  • Water
  • Salt
The acid used in the making of vinegar is:
  • formic acid
  • acetic acid
  • sulphuric acid
  • nitric acid
Which of the following statements are correct?
  • Acid turns blue litmus red.
  • Base turns red litmus blue.
  • Both A and B correct
  • Water changes the colour of red litmus.
Caustic soda is the common name for:
  • $$\displaystyle { Mg\left( OH \right) }_{ 2 }$$
  • $$\displaystyle KOH$$
  • $$\displaystyle { Ca\left( OH \right) }_{ 2 }$$
  • $$\displaystyle NaOH$$
Calcium hydroxide (slaked lime) is used in :
  • plastics and dyes
  • fertilizers
  • antacids
  • white washing
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