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The p-Block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements1 Mark
MCQ
Anhydrous borax is:
  • ✓
    $ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 $
  • B
    $\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 \cdot 5 \mathrm{H}_2 \mathrm{O} $
  • C
    $ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 \cdot 10 \mathrm{H}_2 \mathrm{O} $
  • D
    $ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 \cdot 8 \mathrm{H}_2 \mathrm{O} $
✓

Answer

Correct option: A.
$ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 $
Anhydrous borax has formula $ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7 $​.
Anhydrous means no water of crystallisation.

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