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

JEE Main 202313 AprilEvening Shift

Exam: JEE Main
Year: 2023
Date: 13 April
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Main 2023 · 13 April · Evening Shift · Chemistry · p Block Elements (Group 13 & 14)

If the formula of Borax is Na _ 2 B _ 4 O _ x ( OH ) _ y · zH _ 2 O...

If the formula of Borax is

{Na}_{2}{B}_{4}{O}_{x} ( OH{)}_{y} \cdot {zH}_{2}O

, then

x + y + z = ______

Correct answer

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 ${Na}_{2}\left[{B}_{4}{O}_{5} ( OH{)}_{4}\right] . 8{H}_{2}O$

Based on the structural formula, $x = 5, y = 4andz = 8$

$( x + y + z ) = 5 + 4 + 8 = 17$

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