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The group \( 14 \) elements A and B have the first ionization enthalpy values of \( 708 \) and \( 715 \, \text{kJ mol}^{-1} \) respectively. The above values are lowest among their group members. The nature of their ions \( A^{2+} \) and \( B^{4+} \) respectively is:

A group \( 15 \) element forms \( d\pi - d\pi \) bond with transition metals. It also forms hydride, which is a strongest base among the hydrides of other group members that form \( d\pi - d\pi \) bond. The atomic number of the element is __________.

Given below are two statements:
Statement (I) : The metallic radius of Al is less than that of Ga.
Statement (II) : The ionic radius of \( \text{Al}^{3+} \) is less than that of \( \text{Ga}^{3+} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following happens when \( \mathrm{NH_4OH} \) is added gradually to the solution containing \( 1 \, \text{M} \) \( A^{2+} \) and \( 1 \, \text{M} \) \( B^{3+} \) ions? Given: \( K_{sp}[A(OH)_2] = 9 \times 10^{-10} \) and \( K_{sp}[B(OH)_3] = 27 \times 10^{-18} \) at \( 298 \, \text{K} \).

First ionization enthalpy values of first \( 4 \) group \( 15 \) elements are given below: Choose the correct value for the element that is a main component of apatite family:

Consider the following elements \( \mathrm{In} \), \( \mathrm{Tl} \), \( \mathrm{Al} \), \( \mathrm{Pb} \), \( \mathrm{Sn} \) and \( \mathrm{Ge} \).
The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are:

Given below are two statements:
Statement I : \( \mathrm{H_2Se} \) is more acidic than \( \mathrm{H_2Te} \).
Statement II : \( \mathrm{H_2Se} \) has higher bond enthalpy for dissociation than \( \mathrm{H_2Te} \).
In the light of the above statements, choose the correct answer from the options given below:

The correct statements from the following are:
(A) \( \mathrm{Tl^{3+}} \) is a powerful oxidising agent
(B) \( \mathrm{Al^{3+}} \) does not get reduced easily
(C) Both \( \mathrm{Al^{3+}} \) and \( \mathrm{Tl^{3+}} \) are very stable in solution
(D) \( \mathrm{Tl^{+}} \) is more stable than \( \mathrm{Tl^{3+}} \)
(E) \( \mathrm{Al^{3+}} \) and \( \mathrm{Tl^{+}} \) are highly stable
Choose the correct answer from the options given below:

Given below are the atomic number of some group \( 14 \) elements. The atomic number of the element with lowest melting point is:

Given below are the pairs of group \( 13 \) elements showing their relation in terms of atomic radius. (\( \mathrm{B} < \mathrm{Al} \)), (\( \mathrm{Al} < \mathrm{Ga} \)), (\( \mathrm{Ga} < \mathrm{In} \)) and (\( \mathrm{In} < \mathrm{Tl} \)) Identify the elements present in the incorrect pair and in that pair find out the element \( (X) \) that has higher ionic radius \( (M^{3+}) \) than the other one. The atomic number of the element \( (X) \) is:

Given below are two statements:
Statement I : The \( \mathrm{N{-}N} \) single bond is weaker and longer than that of \( \mathrm{P{-}P} \) single bond.
Statement II : Compounds of group \( 15 \) elements in \( +3 \) oxidation states readily undergo disproportionation reactions.
In the light of the above statements, choose the correct answer from the options given below:

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JEE Main 2025 29th Jan Evening Shift

First ionization enthalpy values of first \( 4 \) group \( 15 \) elements are given below: Choose the correct value for the element that is a main component of apatite family: