JEE Main 2023 (Online) 31st January Evening Shift | Periodic Table & Periodicity Question 31 | Chemistry

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A): The first ionization enthalpy of $3 \mathrm{~d}$ series elements is more than that of group 2 metals

Reason (R): In 3d series of elements successive filling of d-orbitals takes place.

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

Both (A) and (R) are true and (R) is the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are true but $(\mathbf{R})$ is not the correct explanation of (A)

(A) is false but (R) is true

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-1

The correct increasing order of the ionic radii is

$$\mathrm{Cl^- < Ca^{2+} < K^+ < S^{2-}}$$

$$\mathrm{K^+ < S^{2-} < Ca^{2+} < Cl^-}$$

$$\mathrm{Ca^{2+} < K^+ < Cl^- < S^{2-}}$$

$$\mathrm{S^{2-} < Cl^- < Ca^{2+} < K^+}$$

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

-1

Bond dissociation energy of "E-H" bond of the "$\mathrm{H}_{2} \mathrm{E}$ " hydrides of group 16 elements (given below), follows order.

A. $\mathrm{O}$

B. $\mathrm{S}$

C. Se

D. $\mathrm{Te}$

Choose the correct from the options given below:

$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}$

$\mathrm{D}>\mathrm{C}>\mathrm{B}>\mathrm{A}$

$\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$

$\mathrm{A}>\mathrm{B}>\mathrm{D}>\mathrm{C}$

JEE Main 2023 (Online) 30th January Morning Shift

MCQ (Single Correct Answer)

-1

Match List I with List II