JEE Main 2022 (Online) 25th June Morning Shift | Isolation of Elements Question 41 | Chemistry

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :

$${[Au{(CN)_4}]^ - }$$ and $${[Zn{(CN)_2}{(OH)_2}]^{2 - }}$$

$${[Au{(CN)_2}]^ - }$$ and $${[Zn{(OH)_4}]^{2 - }}$$

$${[Au{(CN)_2}]^{ - }}$$ and $${[Zn{(CN)_4}]^{2 - }}$$

$${[Au{(CN)_4}]^{2 - }}$$ and $${[Zn{(CN)_6}]^{4 - }}$$

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of the following chemical reactions represents Hall-Heroult Process?

Cr₂O₃ + 2Al $$\to$$ Al₂O₃ + 2Cr

2Al₂O₃ + 3C $$\to$$ 4Al + 3CO₂

FeO + CO $$\to$$ Fe + CO₂

2[Au(CN)₂]$$_{(aq)}^ - $$ + Zn(s) $$\to$$ 2Au(s) + [Zn(CN₄)]^2$$-$$

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Match List - I with List - II :

	List - I		List -II
(A)	Sphalerite	(I)	FeCO$$_3$$
(B)	Calamine	(II)	PbS
(C)	Galena	(III)	ZnCO$$_3$$
(D)	Siderite	(IV)	ZnS

Choose the most appropriate answer from the options given below :

(A)-(IV), (B)-(III), (C)-(II), (D)-(I)

(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

(A)-(II), (B)-(III), (C)-(I), (D)-(IV)

(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Calamine and Malachite, respectively, are the ores of :

Nickel and Aluminium

Zinc and Copper

Copper and Iron

Aluminium and Zinc

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