This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.

Reason R: CO tends to get decomposed at higher temperature.

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

A
A is correct but R is not correct
B
Both A and R are correct but R is NOT the correct explanation of A
C
A is not correct but R is correct
D
Both A and R are correct and R is the correct explanation of A
2
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which one of the following statements is incorrect?
A
Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
B
The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
C
van Arkel method is used to purify tungsten.
D
Boron and Indium can be purified by zone refining method.
3
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The methods NOT involved in concentration of ore are

A. Liquation

B. Leaching

C. Electrolysis

D. Hydraulic washing

E. Froth floatation

Choose the correct answer from the options given below :

A
A and C only
B
C, D and E only
C
B, D and C only
D
B, D and E only
4
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
JEE Main Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12