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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
    $1$ and $4$
  • B
    $2$ and $3$
  • C
    $1$ and $2$
  • ✓
    $3$ and $4$
✓

Answer

Correct option: D.
$3$ and $4$
Calcium reacts less violently with water producing the bubbles of hydrogen gas along with calcium hydroxide $\left(\mathrm{Ca}(\mathrm{OH})_2\right)$.
$\text{Ca(s)}+2\text{H}_2\text{O(l)}\rightarrow\text{Ca(OH)}_2\text{(aq) + H}_2\text{(g)}\uparrow$

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