JEE Main 2023 (Online) 30th January Evening Shift | Isolation of Elements Question 15 | Chemistry | JEE Main - ExamSIDE.com

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1

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

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

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

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

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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