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1
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :
A
X and Y are metalloids and Z is a metal.
B
X and Z are non-metals and Y is a metalloid.
C
X is a metalloid, Y is a non-metal and Z is a metal.
D
X, Y and Z are metals.
2
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Identify the elements X and Y using the ionisation energy values given below :

Ionization energy (kJ/mol)
1$${st}$$ 2$${nd}$$
X 495 4563
Y 731 1450
A
X = F; Y = Mg
B
X = Mg; Y = F
C
X = Na; Y = Mg
D
X = Mg; Y = Na
3
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : Size of Bk3+ ion is less than Np3+ ion.

Reason R : The above is a consequence of the lanthanoid contraction.

In the light of the above statements, choose the correct answer from the options given below :
A
Both A and B are true and R is the correct explanation of A
B
A is false but R is true
C
A is true but R is false
D
Both A and B are true but R is not the correct explanation of A
4
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
The correct order of electron gain enthalpy is :
A
Te > Se > S > O
B
S > Se > Te > O
C
S > O > Se > Te
D
O > S > Se > Te
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