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NEET Questions / Chemistry / Classification of Elements and Periodicity in Properties
An element 'X' has the highest third ionization enthalpy in the 3d series. Which of the following is most likely to be 'X'?
Cr
Mn
Fe
Cu
Which of the following properties generally decreases across a period from left to right, but shows an anomalous increase at Group 15 elements compared to Group 14 and 16 elements?
Ionization enthalpy
Atomic radius
Electronegativity
Electron gain enthalpy
An element 'X' in the third period exhibits a sharp increase in its third ionization enthalpy. Element 'X' forms an amphoteric oxide and reacts with both acids and bases. Identify 'X'.
Mg
Si
P
Al
Which element in the fourth period exhibits the lowest second ionization enthalpy?
Potassium (K)
Calcium (Ca)
Gallium (Ga)
Krypton (Kr)
Down Group 13, the atomic radii generally increase. However, the difference in atomic radii between Ga and Al is smaller than expected. This anomaly is primarily attributed to:
The increased shielding effect of d-electrons
The lanthanide contraction
The d-block contraction
Relativistic effects
Which of the following factors does NOT significantly influence the ionization energy of an element?
Effective Nuclear Charge
Atomic Radius
Electron Shielding
Nuclear Spin
Which element exhibits the largest jump in ionization energy between its second and third ionization energies?
Na
Mg
Al
Si
Which of the following oxides exhibits the strongest oxidizing power in acidic medium?
Which of the following oxides is most likely to dissolve in a strongly alkaline solution to form a complex ion?
Which pair of oxides exhibits both acidic and basic character, respectively, towards water?
SO₂ and MgO
Al₂O₃ and ZnO
Na₂O and P₄O₁₀
MgO and SO₂
