Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is :

Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy?

Solution

The smaller the atomic size, larger is the value of ionisation potential. Further the atoms having half filled or fully filled orbitals are comparitively more stable,hence more energy is required to remove the electron from such atoms.

The stability of + 1 oxidation state increases in the sequence:

Solution

The stability of +1 oxidation state increases from aluminium to thallium i.e.Al < Ga < In < Tl.

Which one of the following ionic species has the greatest proton affinity to form stable compound?

Solution

Proton affinity decreases in moving across the period from left to right due to increase in charge, within a group the proton affinities decreases from top to bottom. Nitrogen family > Oxygen family > Halogens.

Identify the correct order of the size of the following:

Solution

For isoelectronic species, size of anion increases as negative charge increases whereas size of cation decreases with increase in positive charge. Further ionic radii of anions is more than that of cations. Thus the correct order is Ca⁺⁺ < K⁺ < Ar < Cl^- < S^--

Which of the following properties of elements does not exhibit the periodicity ?

In general, the ionization potentials of elements decreases as one proceeds in the periodic table

Correct order of polarising power is

The first ionization potential of Na, Mg, Al and Si are in the order

Which of the following cations acts as an oxidizing agent?

Solution

Tl shows the inert pair effect. Hence Tl⁺ oxidation state is more stable than Tl³⁺.

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