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COMEDK 2020
MCQ (Single Correct Answer)
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Out of Syllabus

During the extraction of gold the following reactions take place

$$\mathrm{Au + C{N^ - } + {H_2}O\buildrel {{O_2}} \over \longrightarrow [X]}$$

$$\mathrm{[X] + Zn\buildrel {} \over \longrightarrow [Y] + Au}$$

X and Y are respectively

A
$${[Au{(CN)_2}]^ - }$$ and $${[Zn{(CN)_4}]^{2 - }}$$
B
$${[Au{(CN)_4}]^{3 - }}$$ and $${[Zn{(CN)_4}]^{2 - }}$$
C
$${[Au{(CN)_4}]^{2 - }}$$ and $${[Zn{(CN)_4}]^{2 - }}$$
D
$${[Au{(CN)_2}]^ - }$$ and $${[Zn{(CN)_6}]^{4 - }}$$
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0
Out of Syllabus

Ellingham diagram represents a graph of

A
$$\Delta G$$ vs T
B
$$\Delta G \Upsilon$$ vs T
C
$$\Delta S$$ vs p
D
$$\Delta G$$ vs T
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0
Out of Syllabus

Identify the ore not containing iron

A
chalcopyrites
B
carnallite
C
siderite
D
limonite
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