1
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is :

A

AO

B

AO2

C

A2O

D

A2O3

2
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :

A

834 kJ mol−1

B

947 kJ mol−1

C

1402 kJ mol−1

D

1012 kJ mol−1

3
JEE Main 2025 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

An element ‘E’ has the ionisation enthalpy value of 374 kJ mol⁻¹. ‘E’ reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and −295 kJ mol⁻¹, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is :

A

EB > EA > EC > ED

B

EA > EB > EC > ED

C

ED > EC > EA > EB

D

ED > EC > EB > EA

4
JEE Main 2025 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement (I) : The radii of isoelectronic species increases in the order.

Mg2+ < Na+ < F$-$ < O2-

Statement (II) : The magnitude of electron gain enthalpy of halogen decreases in the order.

Cl > F > Br > I

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are correct

C

Statement I is correct but Statement II is incorrect

D

Both Statement I and Statement II are incorrect

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