JEE Main · 2019 · 12 Apr 2019 · Shift 2 · General Principles and Processes of Isolation of Metals

The correct statement is:

(A)leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate✓ Correct
(B)the Hall-Heroult process is used for the production of aluminium and iron
(C)the blistered appearance of copper during the metallurgical process is due to the evolution of $CO_{2}$
(D)pig iron is obtained from cast iron

Answer: (A)

Solution

In Bayer's process bauxite is leached with hot concentrated

NaOH

, which dissolves alumina as sodium aluminate and silica as sodium silicate, so that statement is sound. The Hall–Heroult process makes only aluminium, not iron; the blistered copper comes from escaping

SO X_{2}

, not

CO X_{2}

; and cast iron is made from pig iron, not the reverse. The correct statement is the one about leaching bauxite to sodium aluminate and sodium silicate.

JEE Main · 2019 · 12 Apr 2019 · Shift 2 · Single correct option

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JEE Main · 2019 · 12 Apr 2019 · Shift 2 · General Principles and Processes of Isolation of Metals

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