📚NCERT Questions — CBSE11

According to Table 5.4, if Δ_r H° is negative and Δ_r S° is positive, what is the spontaneity of the reaction?

For the reaction CCl₄(g) → C(g) + 4Cl(g), if Δ_a H°(C) = 715.0 kJ mol⁻¹ and Δ_a H°(Cl₂) = 242 kJ mol⁻¹, what is the bond enthalpy of a C-Cl bond in CCl₄(g)? (Assume Δ_vap H°(CCl₄) = 30.5 kJ mol⁻¹ and

Bohr's model quantizes the angular momentum of an electron in a stationary state. The expression for this quantized angular momentum is:

Unlike permanganate, dichromate ion (Cr2O72-) is not a self-indicator. How is its endpoint typically detected?

In terms of oxidation number, what defines reduction?

Which of the following numbers, when expressed in scientific notation, correctly represents 100 with three significant figures?

To raise the temperature of 60.0 g of aluminium from 35°C to 55°C, how much heat (in kJ) is required? Molar heat capacity of Al is 24 J mol⁻¹ K⁻¹ (Molar mass of Al = 27 g/mol).

The longest wavelength doublet absorption transition is observed at 589 nm and 589.6 nm. Calculate the energy difference between the two excited states. (h = 6.626 x 10⁻³⁴ J s, c = 3.00 x 10⁸ m s⁻¹)

What is the geometry of a molecule with a central atom having three bond pairs and no lone pairs (AB3 type)?

If a substance has a large heat capacity, what does this imply about its temperature change for a given amount of heat?