Class 12 Chemistry · Chapter 1 · Test 2
Group 2 Reactivity
44 MCQs This test covers the reactions of Be, Mg, Ca, Sr and Ba with oxygen, water, steam and dilute acids, with equations, hydroxide basicity and simple mole calculations.
44 questions · 40 min · 44 marks
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Sample questions
The first 5 of 44. Try each one, then tap to see the answer.
Question 1
Which Group 2 oxide forms the most alkaline solution in water?
- ABeryllium oxide
- BMagnesium oxide
- CCalcium oxide
- DStrontium oxide
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Answer: D
Basic character of Group 2 oxides and hydroxides increases down the group so SrO gives the most alkaline solution here.
Question 2
Which Group 2 element does not react with water or steam?
- ABeryllium (Be)
- BMagnesium (Mg)
- CCalcium (Ca)
- DAll Group 2 metals react
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Answer: A
Beryllium is the least reactive member of the group; its protective oxide layer prevents reaction with water or steam.
Question 3
What are the products when magnesium reacts with steam?
- AMg(OH)2 and H2
- BMgO and H2
- CMg(OH)2 only
- DMgO and H2O
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Answer: B
Magnesium burns in steam to form magnesium oxide and hydrogen: Mg + H2O → MgO + H2.
Question 4
The species formed when a Group 2 basic oxide (e.g., CaO) reacts with water:
- AA salt and hydrogen
- BA metal hydroxide
- CA metal carbonate
- DA salt and water
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Answer: B
A basic oxide reacts with water to form the metal hydroxide: CaO + H2O → Ca(OH)2.
Question 5
Which is the balanced equation for the reaction of calcium with oxygen?
- ACa + O2 → CaO2
- BCa + O2 → CaO
- C2Ca + O2 → 2CaO
- D2Ca + 2O2 → 2CaO2
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Answer: C
Calcium burns in oxygen to form calcium oxide: 2Ca + O2 → 2CaO.
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