Acids, Bases and Salts NDA Questions

NDA Chemistry

Acids, Bases and Salts MCQ Questions


1.
Acids are substances that have a sour taste. Which of the following acids gives the sour taste to vinegar?
A.
Citric acid
B.
Tartaric acid
C.
Acetic acid (CH₃COOH — ethanoic acid)
D.
Formic acid
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ANSWER :
C. Acetic acid (CH₃COOH — ethanoic acid)
2.
When a metal reacts with dilute acid, which gas is generally evolved?
A.
Oxygen (O₂)
B.
Carbon dioxide (CO₂)
C.
Hydrogen gas (H₂)
D.
Nitrogen (N₂)
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ANSWER :
C. Hydrogen gas (H₂)
3.
When dilute sulphuric acid reacts with sodium carbonate, which gas is evolved that turns lime water milky?
A.
Sulphur dioxide (SO₂)
B.
Hydrogen (H₂)
C.
Hydrogen sulphide (H₂S)
D.
Carbon dioxide (CO₂)
😑 View Answer Rough Work Error
ANSWER :
D. Carbon dioxide (CO₂)
4.
What is the product when dilute hydrochloric acid reacts with zinc oxide?
A.
Zinc Chlorate + Water
B.
Zinc chloride (ZnCl₂) and water: ZnO + 2HCl → ZnCl₂ + H₂O
C.
Zinc + Water + Chlorine
D.
Zinc Hydroxide + Hydrochloric gas
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ANSWER :
B. Zinc chloride (ZnCl₂) and water: ZnO + 2HCl → ZnCl₂ + H₂O
5.
Dilute acids conduct electricity because:
A.
Acids contain free electrons that move through the solution
B.
Acids are molecular compounds that are naturally metallic
C.
Acid molecules move physically to conduct current
D.
They ionise completely or partially in water, producing H⁺ ions (and corresponding anions) that carry electric current
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ANSWER :
D. They ionise completely or partially in water, producing H⁺ ions (and corresponding anions) that carry electric current
6.
What is the action of a dry litmus paper on dry HCl gas?
A.
Litmus turns red immediately
B.
Litmus turns green
C.
No change in colour (dry HCl does not ionise without water and cannot affect litmus)
D.
Litmus turns blue
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ANSWER :
C. No change in colour (dry HCl does not ionise without water and cannot affect litmus)