chemistry : class12 Sulfate Minerals of Sulfur : Occurrence of Group 16 elements : p-Block Elements MCQ Questions and Answers
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Sulfate Minerals of Sulfur
MCQ questions and answers.
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MCQ Questions
1. Which mineral is correctly matched with its chemical formula and hydration state?
A.
Gypsum — CaSO4·2H2O
B.
Anhydrite — CaSO4·2H2O
C.
Barite — BaSO4·10H2O
D.
Epsomite — MgSO4·H2O
Correct Answer:
Gypsum — CaSO4·2H2O
Explanation:
Gypsum is the dihydrate sulfate mineral CaSO4·2H2O. Anhydrite is the anhydrous form CaSO4, barite is BaSO4, and epsomite is MgSO4·7H2O.
2. A naturally occurring sulfate mineral contains calcium sulfate without water of crystallisation. Which mineral is it?
A.
Gypsum
B.
Anhydrite
C.
Epsomite
D.
Glauber salt
Correct Answer:
Anhydrite
Explanation:
Anhydrite is the anhydrous calcium sulfate mineral, represented by CaSO4. Gypsum is the hydrated form, CaSO4·2H2O.
3. Which pair consists exclusively of sulfate minerals containing water of crystallisation?
A.
Gypsum and epsomite
B.
Barite and anhydrite
C.
Celestine and anglesite
D.
Anhydrite and barite
Correct Answer:
Gypsum and epsomite
Explanation:
Gypsum is CaSO4·2H2O and epsomite is MgSO4·7H2O; both contain water of crystallisation. Barite, celestine, anglesite, and anhydrite are represented as anhydrous sulfates.
4. Which sulfate mineral is known as Glauber's salt and has the composition Na2SO4·10H2O?
A.
Epsomite
B.
Glauber salt
C.
Gypsum
D.
Celestine
Correct Answer:
Glauber salt
Explanation:
Glauber's salt is the hydrated sodium sulfate mineral Na2SO4·10H2O. Epsomite is MgSO4·7H2O, while gypsum is CaSO4·2H2O.
5. A mineral specimen contains MgSO4·7H2O. Which name correctly identifies it?
A.
Epsomite
B.
Gypsum
C.
Barite
D.
Anglesite
Correct Answer:
Epsomite
Explanation:
Epsomite is the heptahydrate of magnesium sulfate, MgSO4·7H2O, and is a naturally occurring sulfate mineral.
6. Which sequence correctly orders the minerals by increasing number of water molecules per formula unit: anhydrite, gypsum, epsomite, Glauber's salt?
A.
Anhydrite < gypsum < epsomite < Glauber's salt
B.
Gypsum < anhydrite < Glauber's salt < epsomite
C.
Anhydrite < epsomite < gypsum < Glauber's salt
D.
Glauber's salt < epsomite < gypsum < anhydrite
Correct Answer:
Anhydrite < gypsum < epsomite < Glauber's salt
Explanation:
Anhydrite contains no water, gypsum contains 2H2O, epsomite contains 7H2O, and Glauber's salt contains 10H2O per formula unit.
7. Which mineral is the principal naturally occurring barium sulfate?
A.
Celestine
B.
Barite
C.
Anglesite
D.
Anhydrite
Correct Answer:
Barite
Explanation:
Barite is the naturally occurring barium sulfate mineral, BaSO4. Celestine is SrSO4, anglesite is PbSO4, and anhydrite is CaSO4.
8. Which set correctly matches each sulfate mineral with its dominant metal cation?