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The ionic radii of \( \mathrm{F^-} \) and \( \mathrm{O^{2-}} \) respectively are \( 1.33\, \overset{\circ}{A}\) and \( 1.4\,\overset{\circ}{A} \), while the covalent radius of \( \mathrm{N} \) is \( 0.74\,\overset{\circ}{A}\).
The correct statement for the ionic radius of \( \mathrm{N^{3-}} \) from the following is:

The ionic radius of \( \mathrm{Na^+} \) ion is 1.02 Å. The ionic radii (in Å) of \( \mathrm{Mg^{2+}} \) and \( \mathrm{Al^{3+}} \), respectively, are:

The characteristics of elements X, Y and Z with atomic numbers, respectively, \( 33 \), \( 53 \) and \( 83 \) are:

The Correct order of first ionization enthalpy is:

The absolute value of the electron gain enthalpy of halogens satisfies:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason (R) : It is due to increase in ionization enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.
In the light of the above statements, choose the most appropriate answer from the options given below:

The set of elements that differ in mutual relationship from those of the other sets is :

The correct order of ionic radii for the ions, \( \mathrm{P^{3-}}, \ \mathrm{S^{2-}}, \ \mathrm{Ca^{2+}}, \ \mathrm{K^+}, \ \mathrm{Cl^-} \) is :

Which one of the following statements for D.I. Mendeleeff, is incorrect?

Match List-I with List-II :

Choose the most appropriate answer from the options given below :

In the ground state of atomic \( \mathrm{Fe} \) \( (Z = 26) \), The spin only magnetic moment is _______ \( \times 10^{-1} \) \( \mathrm{BM} \). (Round off to the Nearest Integer) [Given: \( \sqrt{3} = 1.73 \), \( \sqrt{2} = 1.41 \)]

The first ionization energy of magnesium is smaller as compared to that of elements \( X \) and \( Y \), but higher than that of \( Z \). The elements \( X \), \( Y \) and \( Z \), respectively, are:

Chalcogen group elements are:

The ionic radii of \( \mathrm{K^+} \), \( \mathrm{Na^+} \), \( \mathrm{Al^{3+}} \) and \( \mathrm{Mg^{2+}} \) are in the order:

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JEE Main 2021 22nd July Evening Shift

Which one of the following statements for D.I. Mendeleeff, is incorrect?