Classification of elements and periodicity in properties practice · Mixed difficulty

The electron affinity of $K_{(g)}^ +$ ion is numerically equal to

Among $\mathrm{Zn}(\mathrm{OH})_2, \mathrm{Sn}(\mathrm{OH})_2, \mathrm{Cu}(\mathrm{OH})_2, \mathrm{Fe}(\mathrm{OH})_3, \mathrm{~Pb}(\mathrm{OH})_2, \mathrm{Al}(\mathrm{OH})_3$
The number of hydroxides which are soluble in excess of $\mathrm{NaOH}$ solution is

The correct order of ionisation energy is

Which of the following statement is incorrect?

Which one of the following elements has the highest ionisation energy?

The atomic orbitals used for filling in sixth period of periodic table are

Identify the wrong statement in the following.

......... is measured as the radius of an atom's core which is in contact with the core of an adjacent atom in a bonded situation.

Considering the elements $\mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{F}$ and $\mathrm{Si}$, the correct order of their non-metallic character is

Which of the following is a transition element?

Which of the following order is correct?
A) $N{H_3} < P{H_3} < As{H_3}$ (Reducing nature)
B) $Na > Mg > Al > Si$ (Radius)
C) $Li < Be < B < C\left( {\mathrm{I}\mathrm{.}{\mathrm{E}_1}} \right)$
D) $O < F < S < Cl\,\,\,(EA)$

Which of the following set of elements cannot be a triad

Correct statements among the following is /are:-

The number of elements which can be accommodated in the present set-up of the long form of the periodic table is:

The element with electronic configuration $1{s^2}2{s^2}2{p^6}3{s^2}$ is

Which of the following is the correct order of electron gain enthalpy

Lothar Meyer plotted the physical properties such as atomic volume, melting point and ...$X$... against atomic weight. Here, ${X}$ refers to

Which important property did Mendeleev use to classify the elements in his periodic table?

If the ionisation potential is IE, electron affinity is EA and electronegativity is X, which of the following relation is correct

When an electron is removed from an atom, its energy

Screening by inner electrons will be more effective in

Which of the following is incorrect?

Which among the following is a representative element?

Assertion :- ${H}_2 {Se}$ is less acidic than ${H}_2 {S}.$

Reason :- $S$ is less electronegative than $Se.$

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

The successive ionisation energy values for an element &lsquo;X&rsquo; are given below XV. Ist ionisation energy =410 kJ $\mathrm{mo}{\mathrm{l}^{ - 1}}$ XVI. 2nd ionisation energy =820 kJ $\mathrm{mo}{\mathrm{l}^{ - 1}}$ XVII. 3rd ionisation energy =1100 kJ $\mathrm{mo}{\mathrm{l}^{ - 1}}$ XVIII. 4th ionisation energy =1500 kJ $\mathrm{mo}{\mathrm{l}^{ - 1}}$ XIX. 5th ionisation energy =3200 kJ $\mathrm{mo}{\mathrm{l}^{ - 1}}$ Find out the number of valence electron for the atom &lsquo;X &rsquo;

Given below are two statements :
Statement (I) : Both metal and non-metal exist in p and d-block elements
Statement (II) : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals.
In the light of the above statements, choose the most appropriate answer from the option given below:

First and second ionisation energies of magnesium are 7.646 and $15.035 \mathrm{eV}$ respectively. The amount of energy in $\mathrm{kJ}$ needed to convert all the atoms of magnesium into $\mathrm{Mg}^{2+}$ ions present in $12 \mathrm{mg}$ of magnesium vapours is :

[Given : $1 \mathrm{eV}=96.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ ]

Which of the following process requires largest amount of energy

The metallic radius of sodium is $1.86\,\,\mathop \mathrm{A}\limits^\mathrm{o} ,$ where as its cation radius from its vapour state is