1
JEE Main 2023 (Online) 1st February Morning Shift
+4
-1

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
+4
-1
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
+4
-1

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
+4
-1

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. 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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