📚NCERT Questions — CBSE11
591 solved questions with detailed explanations
How many significant figures are in the number 285 cm?
An atom of an element contains 29 electrons and 35 neutrons. Deduce the atomic symbol of the element.
Calculate the wavelength of electromagnetic radiation emitted by a transmitter broadcasting at a frequency of 1368 kHz. (Speed of light c = 3.00 x 10⁸ m s⁻¹)
In a metal displacement reaction, the reducing metal is typically:
For the reaction H2(g) + I2(g) <=> 2HI(g), Kc = 57.0 at 700 K. If at a certain time, the molar concentrations are [H2] = 0.10 M, [I2] = 0.20 M, and [HI] = 0.40 M, in which direction will the reaction
Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol⁻¹.
How many elementary entities are contained in one mole of a substance?
What does the enthalpy of dilution (Δ_dil H) represent?
Electromagnetic waves are characterized by oscillating electric and magnetic fields that are oriented how with respect to each other and the direction of propagation?
Calculate the de Broglie wavelength of a ball of mass 0.1 kg moving with a velocity of 10 m s⁻¹. (h = 6.626 x 10⁻³⁴ J s)