AIIMS Chemistry Classification Of Elements Periodicity In Properties Class 11 Questions

Which pair of elements has maximum electronegativity difference?

Which is least soluble?

Assertion: Li has high ionization enthalpy, while Li is the strongest reducing agent in aqueous solution. Reason: Li has high oxidation potential.

For which of the following ionic species radius would be maximum?

The element having greatest difference between its first and second ionization energies, is:

The correct order of hydration enthalpies of alkali metal ions is:

Assertion : $\text{Cl}$, Brand $\text{I}$ show disproportionation, but $\text{F}$ doesn't. Reason : This is because it is the most electronegative element of the group.

Assertion: Ionisation enthalpy of beryllium is higher than that of boron. Reason: Across the period, from left to right, ionization enthalpy decreases.

Assertion : Among alkaline earth metals, Be predominantly forms compounds with covalent bond. Reason : Be is larger in size and hence has greater polarising power.

Following table shows the successive molar ionisation energy (kJ mol⁻¹) of five elements A to E. Which two elements are most likely to be in the same group of the periodic table?

Choose the correct.

First three ionisation energies (in $\text{kJ/mol}$) of three representative elements are given below: | Element | $\text{IE}_1$ | $\text{IE}_2$ | $\text{IE}_3$ | | :---: | :---: | :---: | :---: | | P | 495.8 | 4562 | 6910 | | Q | 737.7 | 1451 | 7733 | | R | 577.5 | 1817 | 2745 | Then incorrect option is:

Assertion : Second ionization enthalpy will be higher than the first ionization enthalpy. Reason : Ionization enthalpy is a quantitative measure of the tendency of an element to lose electron.

Arrange the elements $Se$, $Cl$ and $S$ in the increasing order of ionisation energy

Which of the following does not represent the correct order of the properties indicated?

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice. Assertion (A) Generally alkali and alkaline earth metals form superoxides. Reason (R) There is a single bond between O and 0 in superoxides.

Large difference in boiling points is observed in

An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of (X)? It has

Assertion: Generally alkali and alkaline earth metals form superoxides. Reason: There is single bond between O and O in superoxides.

Which two elements are most likely to be in the same group of the periodic table?

Europium is

Which of the following is not an actinoid?

The period number in the long form of the periodic table is equal to

Which of the following element has lowest melting point?

The first ionisation enthalpy of Na, Mg and Si are 496, 737, 776 kJ/mol respectively. What will be the first ionisation enthalpy potential of Al in kJ/mol?

Difference in atomic radius is maximum for

Which of the following is correct?

Which of the following sequence contains atomic number of only representative elements?

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

Largest difference in radii is found in case of the pair

Assertion : F is more electronegative than Cl. Reason : F has high electron affinity than Cl.

The pair of amphoteric hydroxides is

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

For electron affinity of halogens which of the following is correct?

Assertion: Ionisation potential of B (atomic no.4) is less than Be (atomic no. 5). Reason: The first electron released from Be is of p-orbital but that from B is of s-orbital.

Which one of the following is the correct order of the size of iodine species?

Identify the transition element: