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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals1 Mark
MCQ
A metal which reacts with cold water vigorously producing hydrogen is :
  • A
    Zinc
  • B
    Tungsten
  • ✓
    Sodium
  • D
    Mercury
✓

Answer

Correct option: C.
Sodium
Metals like zinc, tungsten, and mercury do not readily react with cold water.
On the other hand, alkali metals are the most reactive metals in the periodic table so, when sodium is brought in contact with cold water, it reacts vigorously.
The reaction is violent and exothermic.
$2 \mathrm{Na}(\mathrm{s})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2(\mathrm{g})$

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