1
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
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
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
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) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match items of column I and II

Column I (Mixture of compounds) Column II (Separation Technique)
A. $$\mathrm{H_2O/CH_2Cl_2}$$ i. Crystalization
B. JEE Main 2023 (Online) 31st January Morning Shift Chemistry - Isolation of Elements Question 12 English ii. Differential solvent extraction
C. Kerosene / Naphthalene iii. Column chromatography
D. $$\mathrm{C_6H_{12}O_6/NaCl}$$ iv. Fractional Distillation

Correct match is

A
A-(ii), B-(iv), C-(i), D-(iii)
B
A-(iii), B-(iv), C-(ii), D-(i)
C
A-(i), B-(iii), C-(ii), D-(iv)
D
A-(ii), B-(iii), C-(iv), D-(i)
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