HARDMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Achiever Section

Aluminium becomes passive in:

A.conc. HNO₃

B.H₂CrO₄

C.HClO₄

D.all of these✓ Correct

Explanation

Aluminium becomes passive in all of these.On addition of strong acids like Nitric acid,chromic acid and per- chloric acid it is converted to alumina. Since, it forms a protective oxide layer over it and can prevent the fur- ther attack of acid. Therefore, aluminium containers are safer to store nitric acid. Passage (Ques. 25 to 29) Fused 2 6 11 2 3 3 Ca B O Na CO (A) (B) CaCO + ¾¾¾® + + 2 2 3 Solution (A) CO (B) Na CO + ¾¾® + 2 H O (B) Conc.HCl NaCl Acid Acid(C) + ¾¾® + ¾¾¾ ® Strongly heated (C) (D) ¾¾¾® Heated 4 inflame (D) CuSO Blue coloured (E) compound + ¾¾¾®

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