📚NCERT Questions — CBSE11
591 solved questions with detailed explanations
A photon detector receives a total of 3.15 x 10⁻¹⁸ J from radiations of 600 nm. Calculate the number of photons received by the detector. (h = 6.626 x 10⁻³⁴ J s, c = 3.00 x 10⁸ m s⁻¹)
Which instrument is used to measure the heat absorbed or evolved at constant volume?
Which of the following electronic configurations represents a half-filled subshell that exhibits extra stability?
What is the difference between intermolecular and intramolecular hydrogen bonding?
Given Δ_r H° = -92.4 kJ mol⁻¹ for N₂(g) + 3H₂(g) → 2NH₃(g), what is the standard enthalpy of formation of NH₃ gas?
Indicate the number of unpaired electrons in Kr (Z=36).
What is the hybridisation of the central atom in [Ni(CN)4]2-?
Predict whether the entropy increases or decreases for the process: 2NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g).
Which of the following sets of quantum numbers is NOT possible?
If acetate ions (CH3COO-) are added to an acetic acid (CH3COOH) solution at equilibrium, what happens to the concentration of hydrogen ions (H+)?