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1
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
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-1
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Which of the following metals can be extracted through alkali leaching technique?

A
$$\mathrm{Sn}$$
B
Cu
C
$$\mathrm{Au}$$
D
$$\mathrm{Pb}$$
2
JEE Main 2023 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
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-1
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The setting time of Cement is increased by adding :

A
Gypsum
B
Limestone
C
Clay
D
Silica
3
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
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-1
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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
4
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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.
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