Acids, Bases and Salts NDA Questions

NDA Chemistry

Acids, Bases and Salts MCQ Questions


13.
Milk of magnesia [Mg(OH)₂ suspension in water] is used as an antacid because:
A.
It reacts with food proteins to prevent acid formation
B.
It produces CO₂ that dilutes stomach acid
C.
It converts HCl into a gas that is expelled
D.
It is a weak base that neutralises excess hydrochloric acid in the stomach without being harmful to the body
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ANSWER :
D. It is a weak base that neutralises excess hydrochloric acid in the stomach without being harmful to the body
14.
What does a base do to red litmus paper?
A.
Turns it blue
B.
Turns it colourless
C.
Has no effect
D.
Turns it green
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ANSWER :
A. Turns it blue
15.
Which of the following is an example of an amphoteric oxide?
A.
Iron(III) oxide (Fe₂O₃)
B.
Sulphur dioxide (SO₂)
C.
Zinc oxide (ZnO)
D.
Sodium oxide (Na₂O)
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ANSWER :
C. Zinc oxide (ZnO)
16.
Litmus solution is a natural indicator extracted from:
A.
Rose petals
B.
Lichens (a symbiotic organism of algae and fungi)
C.
Turmeric rhizomes
D.
Red cabbage leaves only
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ANSWER :
B. Lichens (a symbiotic organism of algae and fungi)
17.
The colour of phenolphthalein in acidic, neutral and basic solutions respectively is:
A.
Colourless, pink, red
B.
Colourless, colourless, pink/magenta
C.
Pink, colourless, blue
D.
Red, orange, yellow
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ANSWER :
B. Colourless, colourless, pink/magenta
18.
Methyl orange indicator in acidic solution turns:
A.
Red (transitions from yellow in base to red in acid, with orange at the endpoint pH 3.1-4.4)
B.
Blue
C.
Green
D.
Colourless
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ANSWER :
A. Red (transitions from yellow in base to red in acid, with orange at the endpoint pH 3.1-4.4)