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1
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which of the following is Lindlar catalyst?
A
Partially deactivated palladised charcoal
B
Zinc chloride and HCl
C
Sodium and Liquid NH3
D
Cold dilute solution of KMnO4
2
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.

Reason R : Tl metal has fourteen f electrons in its electronic configuration.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
A is correct but R is not correct
B
A is not correct but R is correct
C
Both A and R are correct but R is NOT the correct explanation of A
D
Both A and R are correct and R is the correct explanation of A
3
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]
A
Nd
B
Dy
C
Yb
D
Pr
4
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Mischmetal is an alloy consisting mainly of :
A
lanthanoid and actinoid metals
B
actinoid and transition metals
C
lanthanoid metals
D
actinoid metals
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