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1
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
2
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List I List II
A. Cobalt catalyst I. $$\mathrm{(H_2+Cl_2)}$$ production
B. Syngas II. Water gas production
C. Nickel catalyst III. Coal gasification
D. Brine solution IV. Methanol production

Choose the correct answer from the options given below :

A
A-IV, B-III, C-I, D-II
B
A-IV, B-III, C-II, D-I
C
A-II, B-III, C-IV, D-I
D
A-IV, B-I, C-II, D-III
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one of the following reactions does not occur during extraction of copper?

A
$$\mathrm{2FeS + 3{O_2} \to 2FeO + 2S{O_2}}$$
B
$$\mathrm{FeO + Si{O_2} \to FeSi{O_3}}$$
C
$$\mathrm{CaO + Si{O_2} \to CaSi{O_3}}$$
D
$$\mathrm{2C{u_2}s + 3{O_2} \to 2C{u_2}O + 2S{O_2}}$$
4
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The metal which is extracted by oxidation and subsequent reduction from its ore is :

A
Al
B
Cu
C
Ag
D
Fe
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