📚NCERT Questions — CBSE11

Among the following pairs of orbitals, which orbital will experience the larger effective nuclear charge: 2s and 3s?

According to VSEPR theory, what is the order of repulsive interaction between electron pairs?

The smallest and lightest positively charged particle obtained from hydrogen in canal ray experiments is called a:

Why is a decrease in enthalpy (ΔH < 0) not a universal criterion for spontaneity?

For a spontaneous process, what is the condition for the total entropy change (ΔS_total) of the system and surroundings?

In a chemical equilibrium, what happens to the concentrations of reactants and products over time?

The enthalpies of all elements in their standard states are defined as:

A substance that accepts electrons in a redox reaction is called a/an:

Calculate the radius of Bohr's fifth orbit for a hydrogen atom. (Bohr radius a₀ = 52.9 pm)

Calculate the number of protons, neutrons, and electrons in ⁸⁰Br if it is a neutral atom.