1
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements:

Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.

Statement II: During the Hall-Heroult electrolysis process, purified $\mathrm{Al}_{2} \mathrm{O}_{3}$ is mixed with $\mathrm{Na}_{3} \mathrm{AlF}_{6}$ to lower the melting point of the mixture.

In the light of the above statements, choose the most appropriate answer from the options given below:
A
Statement $\mathrm{I}$ is correct but Statement II is incorrect
B
Statement I is incorrect but Statement II is correct
C
Both Statement I and Statement II are incorrect
D
Both Statement I and Statement II are correct
2
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 $$\mathrm{CuSiO}_{3}$$
3
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
4
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
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