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Most Important Selected Qs for JEE AdvancedChemistryp Block Elements (Group 13 & 14)

How many statements are true in the given question of about? (i) orthoboric acid It is a strong tribasic acid. (ii) orthoboric acid does not act as a proton donor but behaves like a Lewis acid by accepting OH ⁻ ion. (iii) orthoboric acid is prepared by the action of mineral acid on borax solution. (iv) orthoboric acid has a layer structure in which hydrogen bonds unite B ( OH )₃ units. (v) If the number of revolution

Correct answer

9

Step-by-step solution

FTTTTFFFTTFTTT (IX) A is a buffer solution; pH of A = pK _ a =2 B is an aqueous solution of SacNa ; pH of B = 1 2 ( pK _ w + pK _ a + c )=8

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