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

Given below are two statements :

Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats.

Statement II : Silicon forms both electron rich and electron deficient hydrides.

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

A
Statement I is correct but statement II is incorrect
B
Both the statements I and II are correct
C
Both the statements I and II are incorrect
D
Statement I is incorrect but statement II is correct
3
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

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

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
$$\mathrm{Ni+4CO\buildrel \Delta \over \longrightarrow Ni(CO)_4}$$
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