Q1. Which of the following statements is TRUE?
- Endothermic processes decrease the entropy of the surroundings, at constant T and P.
- Exothermic processes are always spontaneous.
- Endothermic processes are never spontaneous.
- Entropy is not a state function
- None of the above are true.
The Solution
Answer is: Endothermic processes decrease the entropy of the surroundings, at constant T and P.
In endothermic process, heat flows from surroundings to system thereby decraeses the disorderness. Hence, entropy of surroundings decreases.
Exothermic processes are always spontaneous = wrong
Endothermic processes are never spontaneous = wrong
Entropy is not a state function = wrong
Entropy is a state function.
Q2. Which of the following statements about sterols is true?
A) All sterols share a fused-ring structure with four rings.
B) Sterols are found in the membranes of all living cells.
C) Sterols are soluble in water, but less so in organic solvents such as chloroform.
D) Stigmasterol is the principal sterol in fungi.
E) The principal sterol of animal cells is ergosterol.
The correct Answer is: A
All sterols share a fused-ring structure with four rings.