JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · p-Block Elements

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The value of n in the molecular formula is

Answer: 3

Solution

This is the formula for beryl, a beryllium aluminum silicate mineral. The formula is .

To verify, we can check the charge balance:
  • Be: 3 × (+2) = +6
  • Al: 2 × (+3) = +6
  • Si: 6 × (+4) = +24
  • O: 18 × (-2) = -36

Total: +6 + 6 + 24 - 36 = 0 ✓

Therefore, n = 3.

JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · Integer answer

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