HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Draw the M.O diagram for oxygen molecule calculate its bond order and show that O₂ is paramagnetic.

Draw MO diagram of CO and calculate its bond order.

What do you understand by Linear combination of atomic orbitals in MO theory?

Discuss the formation of N₂ molecule using MO Theory.

Hydrogen gas is diatomic whereas inert gases are monoatomic – Explain on the basis of MO theory.

Of the ions Ti⁴⁺, Co²⁺ and Cr³⁺, ____________.

The correct thermodynamic conditions for the spontaneous reaction at all temperature is

∆S is expected to be maximum for the reaction

The values of ∆H and ∆S for a reaction are respectively 30 kJ mol^–1 and 100 JK^–1 mol^–1. Then the temperature above which the reaction will become spontaneous is

What is the usual definition of entropy?

What is the unit of entropy?

The Van't Hoff factor (i) for a dilute aqueous solution of the strong elecrolyte barium hydroxide is (NEET) ______.

The freezing point depression constant for water is 1.86° K Kg mol^-1. If 5 g Na₂SO₄ is dissolved in 45 g water, the depression in freezing point is 3.64°C. The Vant Hoff factor for Na₂SO₄ is ______.

Identify the state and path functions out of the following:

1. Enthalpy
2. Entropy
3. Heat
4. Temperature
5. Work
6. Free energy

Phenol dimerizes in benzene having van’t Hoff factor 0.54. What is the degree of association?

State the various statements of the second law of thermodynamics.

What are spontaneous reactions?

Calculate the entropy change in the system, and surroundings, and the total entropy change in the universe during a process in which 245 J of heat flows out of the system at 77°C to the surrounding at 33°C.

1 mole of an ideal gas, maintained at 4.1 atm and at a certain temperature, absorbs heat 3710 J and expands to 2 litres. Calculate the entropy change in the expansion process.

30.4 kJ is required to melt one mole of sodium chloride. The entropy change during melting is 28.4 JK⁻¹ mol⁻¹. Calculate the melting point of sodium chloride.