Boric acid in water produces :- H2BO3–    BO33–(H4BO4–)[B(OH)]–

Total number of mole of reactants involved in the reaction for the preparation of boric acid from tri halide of boron and water is

H3BO3 isSelect an answerAMonobasic and weak Lewis acidBMonobasic and weak Bronsted acidCMonobasic acid and strong Lewis acidDtribasic acid weak Bronsted acid

Identify the incorrect statement about othoboric acidSelect an answerAIt has a layer structure in which planer BO3 units are joined by hydrogen bondsBH3BO3 is a weak monobsic Lewis acidCOn heating orthoboric acid it forms metaboric acid and on further heating to red hot, forms boric oxide anhydrideDIt is obtained by reacting borax with HCl using phenolphthalein as an indicator

H3BO3 and borax

Acid Base & Salts HCl → H+ + Cl- Acid Contains Hydrogen ion which cannot exit independently so it combines with water H+ + H2O →H3O+ Similarly all acids produces Hydronium ions on Ionisation. H2SO4 + 2H2O → 2H3O+ + SO42- Bases produces hydroxyl ions on ionisation NaOH →Na+ + OH- (i)Reaction with active metals- form Hydrogen and Metal Salt Zn + 2HCl → ZnCl2 + H2 ii) Reaction with bases – Neutralisation iii) Reaction with carbonates and bicarbonates (hydrogen carbonates)- form Salt , water and Carbon di oxide iv) Reaction with sulphites and bisulphites- Forms salt , water and Sulphur dioxide. v) Reaction with sulphides- Salt and Hydrogen sulphides vi) Reaction with chlorides and nitrates- Only few (Ba, Pb) reacts with dil HCl rest ( Na, K) reacts only with Conc HCl