HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy

Which one of the following is the least electronegative element?

The element with positive electron gain enthalpy is

The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8, 7 and 12 respectively

Assertion: Helium has the highest value of ionisation energy among all the elements known

Reason: Helium has the highest value of electron affinity among all the elements known

The electronic configuration of the atom having maximum difference in first and second ionisation energies is

Which of the following is the second most electronegative element?

IE₁ and IE₂ of Mg are 179 and 348 kcal mol⁻¹ respectively. The energy required for the reaction \[\ce{Mg -> Mg^2+ + 2e^-}\] is

In a given shell the order of screening effect is

Which of the following orders of ionic radii is correct?

The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol^-1 respectively. The ionisation potential of Al will be closer to

Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

How does electron affinity change when we move from left to right in a period in the periodic table?

What are isoelectronic ions? Give examples.

What is the effective nuclear charge?

Is the definition given below for ionisation enthalpy is correct?

"Ionisation enthalpy is defined as the energy required to remove the most loosely bound electron from the valence shell of an atom"

Magnesium loses electrons successively to form Mg⁺, Mg²⁺ and Mg³⁺ ions. Which step will have the highest ionisation energy and why?

Define electronegativity.

How would you explain the fact that the second ionisation potential is always higher than the first ionisation potential?

Energy of an electron in the ground state of the hydrogen atom is −2.18 × 10⁻¹⁸ J. Calculate the ionisation enthalpy of atomic hydrogen in terms of kJ mol⁻¹.