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JEE Main202313 Apr 2023Evening ShiftChemistryp Block Elements (Group 13 & 14)Actual

If the formula of Borax is Na 2   B 4 O x ( OH ) y · zH 2 O , then   x + y + z =   _ _ _ _ _ _

Correct answer

17

Step-by-step solution

The crude name of borax is Tincal. It has the molecular formula Na 2 B 4 O 7 . 10 H 2 O and structural formula of borax is Na 2   B 4 O 5 ( OH ) 4 . 8 H 2 O Based on the structural formula, x = 5 ,   y =   4   and   z = 8 ( x   +   y   +   z )   =   5   +   4   +   8   =   17

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