Acids, Bases, and Salts CDS Questions

CDS Chemistry

Acids, Bases, and Salts MCQ Questions


1.
Which ion is common to all acids when dissolved in water?
A.
Chloride ion (Cl-)
B.
Hydrogen ion (H+), which exists as hydronium ion (H3O+)
C.
Oxide ion (O2-)
D.
Hydroxide ion (OH-)
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ANSWER :
B. Hydrogen ion (H+), which exists as hydronium ion (H3O+)
2.
What is the effect of an acid on litmus paper and what is its characteristic taste?
A.
Bitter taste; turns red litmus paper blue
B.
Sour taste; turns blue litmus paper red
C.
Sour taste; turns red litmus paper blue
D.
Bitter taste; turns blue litmus paper red
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ANSWER :
B. Sour taste; turns blue litmus paper red
3.
Which of the following is NOT a characteristic property of bases?
A.
Turns blue litmus paper red
B.
Turns red litmus paper blue
C.
Has a bitter taste
D.
Feels soapy or slippery to touch
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ANSWER :
A. Turns blue litmus paper red
4.
According to the Arrhenius concept, a base is a substance that, on dissolving in water:
A.
Donates a proton to another substance
B.
Releases hydrogen (H+) ions
C.
Releases hydroxide (OH-) ions
D.
Accepts a pair of electrons
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ANSWER :
C. Releases hydroxide (OH-) ions
5.
Which gas is typically released when a reactive metal such as zinc or magnesium reacts with a dilute acid?
A.
Hydrogen gas
B.
Oxygen gas
C.
Chlorine gas
D.
Carbon dioxide gas
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ANSWER :
A. Hydrogen gas
6.
Why do aqueous solutions of acids and bases conduct electricity?
A.
Because they are covalent molecular compounds
B.
Because they release a large amount of heat on dissolving
C.
Because they dissociate into free ions in water
D.
Because they contain metallic elements
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ANSWER :
C. Because they dissociate into free ions in water