When calcium reacts with cold water, the products are
Correct answer: C. calcium hydroxide and hydrogen
- A. calcium oxide and hydrogen
- B. calcium hydride and oxygen
- C. calcium hydroxide and hydrogen
- D. calcium carbonate and hydrogen
Explanation
Calcium reacts steadily with cold water to give a suspension of slightly soluble calcium hydroxide, known as limewater when filtered, together with bubbles of hydrogen. Magnesium reacts only very slowly with cold water but readily with steam, which gives the oxide instead. Calcium carbonate would require carbon dioxide to be present.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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