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.

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

The order of size of metal ions is, Li⁺ < Na⁺ < K⁺ < Rb⁺ < Cs⁺ Since the hydration energy is inversely proportional to the size. So, the order of hydration enthalpies is, Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺

Fluorine is the most electronegative element, it shows only (-1) state therefore fluorine will not undergo disproportionation.

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

Be has small size, high ionisation enthalpy and high polarising power. Therefore, it predominantly forms covalent compounds.

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

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: