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Q.

How many moles of $H C l$ react with one mole of borax to boric acid?

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a

3

b

4

c

2

d

9

answer is C.

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Detailed Solution

Following is the hydrolysis process when borax is dissolved in water.

$N a_{2} B_{4} O_{7} + 7 H_{2} O \to 4 H_{3} B O_{3} + 2 N a O H$

Therefore, two moles of $H C l$ will be required to neutralize the borax solution.

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How many moles of HCl react with one mole of borax to boric acid?