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1
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

A
remove $$\mathrm{FeO}$$ as $$\mathrm{FeSiO}_{3}$$
B
remove calcium as $$\mathrm{CaSiO}_{3}$$
C
decrease the temperature needed for roasting of $$\mathrm{Cu}_{2} \mathrm{~S}$$
D
separate $$\mathrm{CuO}$$ as $$\mathrm{CuSiO}_{3}$$
2
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The major component of which of the following ore is sulphide based mineral?

A
Sphalerite
B
Siderite
C
Malachite
D
Calamine
3
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The reaction representing the Mond process for metal refining is _________.

A
$$\mathrm{ZnO+C\buildrel \Delta \over \longrightarrow Zn+CO}$$
B
$$\mathrm{2K[Au(CN)_2]+Zn\buildrel \Delta \over \longrightarrow K_2[Zn(CN)_4]+2Au}$$
C
$$\mathrm{Zr+2I_2 \buildrel \Delta \over \longrightarrow ZrI_4}$$
D
$$\mathrm{Ni+4CO\buildrel \Delta \over \longrightarrow Ni(CO)_4}$$
4
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given below are two statements :

Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it.

Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons.

In the light of the above statements, choose the correct answer from the options given below :

A
Statement I is true but Statement II is false
B
Statement I is false but Statement II is true
C
Both Statement I and Statement II are true
D
Both Statement I and Statement II are false
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