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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals1 Mark
MCQ
What happens when calcium is treated with water?
  1. It does not react with water.
  2. It reacts violently with water.
  3. It reacts less violently with water.
  4. Bubbles of hydrogen gas formed stick to the surface of calcium.
  • A
    $\ce{(i)}$ and $\ce{(iv)}$
  • B
    $\ce{(ii)}$ and $\ce{(iii)}$
  • C
    $\ce{(i)}$ and $\ce{(ii)}$
  • ✓
    $\ce{(iii)}$ and $\ce{(iv)}$
✓

Answer

Correct option: D.
$\ce{(iii)}$ and $\ce{(iv)}$
Calcium metal reacts with water vigorously and produces calcium hydroxide and hydrogen gas.
$\text{Ca(s)}\ +\ 2\text{H}_2\text{O(l)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Ca(OH}_2)(\text{aq})\ +\ \text{H}_2(\text{g})$
$^\text{Calcium}\ \ \ \ \ \ \ \ ^\text{Water}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Calcium hydroxide}\ \ \ \ \ \ ^\text{Hydrogen}$
In this reaction of calcium and water, bubbles of hydrogen gas are formed and get stuck to the surface of calcium metal because of which calcium starts floating.
Reaction of calcium with water is exothermic but heat produced in this reaction is not sufficient so that hydrogen can catch fire.

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