HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

How will you determine activation energy from rate constants at two different temperatures?

Explain with the help of the Arrhenius equation, how do the rate of reaction changes with activation energy.

Write uses of sulphur.

0.01 m aqueous formic acid solution freezes at – 0.021°C. Calculate its degree of dissociation, K_f = 1.86 K kg mol^–1.

Write the correct condition for spontaneity in terms of Gibbs energy.

Draw labelled diagram of H₂ – O₂ fuel cell.

Write two applications of fuel cells.

Identify whether the following pair have larger entropy or not. If yes then Why?

He(g) in a volume of 1 L or He(g) in a volume of 5 L both at 25°C.

Identify whether the following pair have a larger entropy or not. If yes then Why?

O₂{g) at 1 atm or O₂(g) at 10 atm both at the same temperature.

Identify whether the following pair have a larger entropy or not. If yes then Why?

C₂H₅OH(l) or C₂H₅OH(g)

Write modification of expressions of colligative properties with the help of van't Hoff factor.

Write the relationship between Gibbs energy change for a process and total entropy change of system and surroundings.

Calculate the van't Hoff factor assuming the complete dissociation of NaBr in its aqueous solution.

What is a spontaneous process? What are its characteristics?

Calculate ΔT_b and boiling point of 0.05 m aqueous solution of glucose. (Given: K_b = 0.52 K m⁻¹).

Write the mathematical equation between reaction rate constant and its activation energy.

Calculate ΔG for ΔH = − 110 kJ, ΔS = + 40 J K⁻¹ at 400 K.

The value of van't Hoff factor will be minimum for ______.

ΔH for the reaction is − 110 kJ, and ΔS is + 40 JK⁻¹ at 400 K. The free energy change for the reaction is ______.

Explain with the help of Arrhenius equation, how does the rate of reaction changes with temperature.