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Q.

Select the incorrect statement about borax.

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a

It is a useful primary standard for titrating against acids.

b

Its aqueous solution can be used as buffer

c

In its structure out of l0 molecules of H2O, four H2O molecules are part of its structure

d

sp2 hybridized B-atoms only participate in  (pπ−pπ) back bonding

answer is C.

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Detailed Solution

Na2B4O7⋅10H2O+2HCl⟶4H3BO3+2NaCl+5H2OIt is useful for titration against acids. Methyl orange (pH : 3.7) is used to detect end point.Used as buffer since it is a salt of strong base (NaOH) and weak acid (H3BO3)Two molecules of H2O are part of its structure Na2B4O5(OH)4⋅8H2O
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