MEDIUMMCQ SINGLENEET ChemistryInorganic Chemistryp-Block (group 13 and 14)Aluminium and Its Compounds

Select the true statements: (i) The formula of the corundum is Al2O3. (ii) The formula of cryolite is Na3AlF6. (iii) The formula of borax is Na2B4O7.10H2O (iv) The formula of bauxite is Al2O3.H2O

A.(i), (ii) and (iii)✓ Correct

B.(ii), (iii) and (iv)

C.(i), (ii) and (iv)

D.(iii) and (iv)

Explanation

Corundum, Cryolite and Bauxite are the ores of aluminium with chemical formula given below: p-BLOCK (GROUP 13 AND 14) 14 2 3 3 6 2 3 2 Corrundum Al O Cryolite Na AlF Bauxite Al O .2H O - - - Where, Borax is the natural mineral salt of boric acid. Its chemical formula is- 2 4 7 2 Borax Na B O .10H O - Therefore in the given question, Bauxite has 1water of crystallization molecule. But in actual it has 2 water of crystallization molecules.

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