Which is not true about borax? (a) It is a useful primary standard ...

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Which is not true about borax?
(a) It is a useful primary standard for titrating against acids
(b) One mole of borax contains \( 4 \mathrm{~B}-\mathrm{O}-\mathrm{B} \) bonds
\( \mathrm{P} \)
(c) Aqueous solution of borax can be used as buffer
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(d) It is made up of two triangular \( \mathrm{BO}_{3} \) units and two tetrahedral \( \mathrm{BO}_{4} \) units
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