📚NCERT Questions — CBSE11

If a solution contains 2 moles of substance A and 8 moles of substance B, what is the mole fraction of A?

Calculate the wavelength of an electron moving with a velocity of 2.05 x 10⁷ m s⁻¹. (h = 6.626 x 10⁻³⁴ J s, m_e = 9.1 x 10⁻³¹ kg)

The Pauli Exclusion Principle states that no two electrons in an atom can have the same set of:

For a hydrogen atom, the energy of an electron in a stationary state (E_n) is given by E_n = -R_H/n². What does the negative sign in this expression signify?

For a reaction with ΔH = +400 kJ mol⁻¹ and ΔS = +0.2 kJ K⁻¹ mol⁻¹, at what temperature will the reaction become spontaneous?

What is the result of the addition 12.11 + 18.0 + 1.012, reported with the correct number of significant figures?

One atomic mass unit (amu) is defined as a mass exactly equal to one-twelfth of the mass of one:

How is 'oxidation number' defined in the context of covalent compounds?

The atomic number (Z) of an atom is equal to the number of:

Which state of a substance typically has the highest entropy?