Classification of elements and periodicity in properties practice · Mixed difficulty

The pair of elements having approximately equal ionisation potential is

The statement that is not correct for the periodic classification of elements is

The second ionisation enthalpies of elements are always higher than their first ionisation enthalpies because

The first ionisation enthalpy of $Na$ is 5.1 eV, the value of electron gain enthalpy of $N{a^ + }$ will be

The incorrect statement among the following is

The element with Z = 120 (not yet discovered) will be an/a

The tendency towards formation of coloured ions is the maximum in:

The factor not affecting the ionization enthalpy is

What would be the IUPAC name for the element with atomic number 115

Which of the following arrangements represents the increasing order of ionic radii of the given species, ${O^{ - 2}},\,\,{S^{2 - }},\,\,{N^{3 - }},\,\,{P^{3 - }}$

The first ionisation enthalpy values of third period element, $\mathrm{Na}, \mathrm{Mg}$ an $\mathrm{Si}$ are respectively $496,737$ and $786 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The first $\Delta_\mathrm{i} \mathrm{H}$ value for $\mathrm{Al}$ will be close to

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

Which of the following statement is incorrect?

The molecular formula of chloride of Eka-Aluminium and Eka-Silicon respectively are

The magnitude of screening effect depends upon the number of

Assertion : Atomic size along a period decreases.

Reason : $Z_{\text {eff.}}$ in a period decreases.

Given below are two statements:
Statement I: The correct order of first ionization enthalpy values of $\mathrm{Li}, \mathrm{Na}, \mathrm{F}$ and $\mathrm{Cl}$ is $\mathrm{Na} < \mathrm{Li} < \mathrm{Cl} < \mathrm{F}$.
Statement II: The correct order of negative electron gain enthalpy values of $\mathrm{Li}, \mathrm{Na}, \mathrm{F}$ and $\mathrm{Cl}$ is $\mathrm{Na} < \mathrm{Li} < \mathrm{F} < \mathrm{Cl}$
In the light of the above statements, choose the correct answer from the options given below:

The number of naturally occurring p- block elements that are diamagnetic is

The outer electronic configuration of transition element is

Which pair of ions are isoelectronic?

Which of the following obeys triad law :

Considering the elements $F,\,\,\,Cl,\,\,\,O$ and $N$ the correct order of their chemical reactivity in terms of oxidizing property is

Which one of the following elements has lower value of ionisation energy?

Periodic classification of elements is used to examine the

Out of the four blocks in which periodic table is divided, helium belongs to which block?

Which of the following oxides is most acidic in nature?

The first ionization potentials $(\mathrm{eV})$ of ${N}$ and ${O}$ respectively are

Out of $Ne,\,\,N{a^ + },\,\,O,\,\,Na$ and $N,$ the species having maximum and minimum ionization energies respectively are

Identify the correct order of the size of the following

Modern periodic table states that the physical and chemical properties of the elements are periodic functions of thier atomic number. This is given by: