JEE Main 2021 · 24 Feb · Shift 1 · Chemistry Q36

ChemistrySingle correct+4 / -1Question 36 of 90

Al $_2$ O $_3$ was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are :

X = Na[Al(OH)

_4

], Y = SO

_2

, Z = Al

_2

_3

X = Al(OH)

_3

, Y = SO

_2

, Z = Al

_2

_3

.xH

_2

X = Al(OH)

_3

, Y = CO

_2

, Z = Al

_2

_3

X = Na[Al(OH)

_4

], Y = CO

_2

, Z = Al

_2

_3

.xH

_2

Answer and worked solution

Official answer: D

Bayer process. NaOH dissolves Al₂O₃ as Na[Al(OH)₄]; CO₂ neutralises it and precipitates hydrated alumina, Al₂O₃·xH₂O.

(D)

Topics:Extraction of specific metals

JEE Main 2021 · 24 Feb · Shift 1, Chemistry question 36