Which one of the following is not an amphoteric substance?
HCO3−
NH3
HNO3
H2O
A
HCO3−
B
H2O
C
HNO3
D
NH3
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Solution
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Amphoteric substances are substances that display both acidic and basic properties, so they can act as either acids or bases. If an amphoteric substance reacts with a base, then it will take on the role of acid. If an amphoteric substance reacts with an acid, then it will take on the role of base.
HCO3−,H2O,NH3 can act as both donor and acceptor to H+ ions so they are amphoteric in nature.
HNO3 is a strong acid and can only donate H+ ions hence, it is not amphoteric in nature.
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