Chemistry
Assertion (A): Zinc oxide reacts with acids as well as bases to form salt and water.
Reason (R): Zinc oxide is amphoteric in nature.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Analytical Chemistry
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — Zinc oxide reacts with both acids and concentrated alkalis (NaOH and KOH) forming salt and water.
ZnO + 2HCl ⟶ ZnCl2 + H2O
ZnO + 2NaOH ⟶ Na2ZnO2 + H2O
Hence the assertion (a) is true.
Reason (R) is true because zinc oxide is amphoteric in nature, reacts with both acids and concentrated alkalis forming salt and water. Hence Both A and R are true and reason (R) is the correct explanation of assertion(A).
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Related Questions
Assertion (A): Hydrogen gas is liberated when metals like Zn, Al, Pb react with caustic alkalies.
Reason (R): Alkalies are soluble in water.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Oxides of most of the metals are basic in nature.
Reason (R): All metal oxides dissolve in water forming alkalis.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Name:
(a) two coloured metal ions.
(b) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(c) two bases which are not alkalis but dissolve in strong alkalis.
(d) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
(e) a colourless cation not a representative element.
(f) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(g) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(h) a compound containing zinc in the anion.
Write the probable colour of the following salts?
(a) Ferrous salts
(b) Ammonium salts
(c) Cupric salts
(d) Calcium salts
(e) Aluminium salts