📚NCERT Questions — CBSE11

Calculate Δ_r G° for the conversion of oxygen to ozone, 3/2 O₂(g) → O₃(g), at 298 K if K_p for this conversion is 2.47 × 10⁻²⁹. (R = 8.314 J K⁻¹ mol⁻¹)

What is the result of (6.65 x 10^4) + (0.895 x 10^4) with the correct number of significant figures?

A student measures the mass of an object as 9.4 g using a platform balance and 9.4213 g using an analytical balance. What can be inferred about the uncertainty?

What is the oxidation number of hydrogen in metal hydrides like LiH?

If a redox reaction is carried out in a basic solution, how are ionic charges balanced using the oxidation number method?

In PCl5, the axial bonds are slightly longer and weaker than the equatorial bonds. What is the reason for this?

Calculate the oxidation number of sulfur in H2SO5, given that it is a peroxide compound.

For a salt formed from a weak acid and a weak base, such as CH3COONH4, how is the pH of its solution determined?

Calculate the wavenumber for the longest wavelength transition in the Balmer series of atomic hydrogen.

A pulsed radiation source has a duration of 2 ns and emits 2.5 x 10¹⁵ photons. If the average energy of each photon is 3.313 x 10⁻¹⁹ J, calculate the total energy of the source per pulse.