Periodic Table Questions

Which of the following statements are true?A. Unlike Ga that has a very high melting point, Cs has a very low melting point.B. On Pauling scale, the electronegativity values of N and Cl are not the same.C. $Ar,K^{+},C{l}^{-},C{a}^{2+}$, and $S^{2-}$ are all isoelectronic species.D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na.E. The atomic radius of Cs is greater than that of Li and Rb.Choose the correct answer from the options given below:

Assertion : First ionization energy for nitrogen is lower than oxygen.Reason : Across a period effective nuclear charge decreases.

The sequence of ionic mobility in aqueous solution is:

The correct order of decreasing second ionisation enthalpy of $\text{Ti}(22),\text{V}(23),\text{Cr}(24)$ and $\text{Mn}(25)$ is:

Which one of the following arrangements does not give the correct picture of the trends indicated against it?

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

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

Among the following which is the strongest oxidising agent?

Which of the following pairs has the same size?

Which one of the following ions has electronic configuration $[\text{Ar}]3d^6$?

The correct order of the decreasing ionic radii among the following isoelectronic species is:

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements $\text{O, S, F and Cl}$?

Which of the following orders of ionic radii is correctly represented?

Acidity of diprotic acids in aqueous solutions increases in the order:

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?