Thermodynamics Terms

Adsorption of gas on solid surface is exothermic and entropy decreases in the process.

The dissociation reaction of is: Let the initial moles of be . At equilibrium, if mol of is formed, then the amount of dissociated will also be mol, and the amount of formed will be mol. Thus, at equilibrium: - left = mol, - = mol, - = mol. The equilibrium constant expression is: Substituting the values: Thus, the correct answer is .

The rules for significant figures are:
1. Non-zero digits are always significant.
2. Leading zeros (zeros before the first non-zero digit) are NOT significant.
3. Trailing zeros (zeros at the right end) are significant only if there is a decimal point.
4. Zeros between two non-zero digits are always significant.
Option (2) is incorrect because zeros between two non-zero digits ARE significant.
Thus, the correct answer is .

The work done in an isothermal reversible expansion of an ideal gas is given by: where: - mole (given), - L atm K mol , - K, - L, L. Since , Thus, the correct answer is .

: The x-axis represents temperature ( ), and the y-axis represents volume ( ) of the gas.
The line from point Z to point X is a horizontal line, which indicates that the temperature remains constant during this process. In thermodynamics, when the temperature of a system remains constant, it is called an isothermal process.
In an isothermal process, the temperature does not change, and the system can either absorb or release heat to maintain that constant temperature. This is why the graph shows a horizontal line, meaning the temperature ( ) remains constant (in this case, between 300K and 600K).
Thus, the correct answer is Isothermal.