Class 12 Chemistry · Chapter 1 · Test 4
Group 2 Compound Uses
40 MCQs This test covers the Dow process for magnesium, electrolysis of molten MgCl2, and the production of quicklime from limestone, including equations and calculations.
40 questions · 40 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Which industrial process is used to extract magnesium from seawater?
- ADow process
- BHaber process
- CContact process
- DSolvay process
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Answer: A
The Dow process extracts magnesium from the Mg2+ ions in seawater.
Question 2
In the Dow process seawater is first treated with:
- ASodium hydroxide
- BHydrochloric acid
- CCalcium hydroxide
- DSodium carbonate
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Answer: C
Calcium hydroxide precipitates magnesium ions as magnesium hydroxide.
Question 3
What precipitates when Ca(OH)2 is added to seawater in the Dow process?
- AMagnesium chloride
- BMagnesium hydroxide
- CMagnesium oxide
- DCalcium chloride
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Answer: B
Mg2+ is precipitated as insoluble Mg(OH)2.
Question 4
Which equation shows the precipitation of magnesium ions from seawater in the Dow process?
- AMg2+ + CaO → MgO + Ca2+
- BMg2+ + Ca(OH)2 → Mg(OH)2 + Ca
- CMgCl2 + Ca → Mg + CaCl2
- DMg2+(aq) + Ca(OH)2(s) → Mg(OH)2(s) + Ca2+(aq)
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Answer: D
Calcium hydroxide supplies OH- ions that precipitate insoluble Mg(OH)2 leaving Ca2+ in solution.
Question 5
In the Dow process Mg(OH)2 is reacted with hydrochloric acid to form:
- AMgCl2 and H2O
- BMgCl and H2
- CMgO and Cl2
- DMg and HClO
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Answer: A
Mg(OH)2 + 2HCl → MgCl2 + 2H2O.
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