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ChemistryInteger+3Question 25 of 84

IIT-JEE 2010 · Paper 1, Chemistry question 25

The value of n in the molecular formula BeXnAlX2SiX6OX18\ce{Be_nAl2Si6O18} is

Answer and worked solution

Official answer: 3

Charge balance in beryl, BeXnAlX2SiX6OX18\ce{Be_nAl2Si6O18}:
2n+2(3)+6(4)=18(2)  ⟹  2n+30=36  ⟹  n=3.2n+2(3)+6(4)=18(2)\implies2n+30=36\implies n=3.
Beryl is BeX3AlX2SiX6OX18\ce{Be3Al2Si6O18}.

Answer: 3

Topics:Silicates and silicones
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