MCQ on Entropy: Chemistry is considered to be the most scoring subject in NEET JEE Exam. As it is one of the easiest scoring subjects, it is often ignored and undermined a subject. But if you want to get an edge over others, here is a tip, master NEET/JEE Chemistry concepts. Chemistry demands the attention of students in understanding reactions and concrete basic understanding but once done it only gets easier from there. Mastering NCERT syllabus for NEET/JEE Chemistry should be topping your list of to-do for chemistry.

In this post we are providing you MCQ on Entropy, which will be beneficial for you in upcoming NEET, JEE, Medical and Engineering Exams.

MCQ on Entropy

Q1. Which of the following is the correct criteria for a spontaneous process?
a) ΔS_system > 0 only
b) ΔS_surroundings > 0 only
c) ΔS_system – ΔS_surroundings > 0
d) ΔS_system + ΔS_surroundings > 0

Q2. Which of the following is correct for the net entropy change in an irreversible process?
a) It is zero
b) It is positive
c) It is negative
d) All of the above

Q3. For a spontaneous reaction _______.
a) ΔS must be negative
b) ΔH must be negative
c) (ΔH – TΔS) must be negative
d) (ΔH + TΔS) must be negative

Q4. At which of the following temperatures the reaction C_(graphite) + CO_{2 (g)} → 2CO_(g) will occur spontaneously if ΔH = 170 kJ and ΔS = 170 J K^-1?
a) 1110 K
b) 510 K
c) 710 K
d) 910 K

Q5. For spontaneous adsorption of gas _______.
a) ΔS is positive so ΔH should be negative
b) ΔS is negative so ΔH should be highly positive
c) ΔS is negative so ΔH should be highly negative
d) ΔS is positive so ΔH should also be highly positive

Q6. Which of the following is true for the entropy of an isolated system?
a) It can never increase
b) It can never decrease
c) It can never be zero
d) None of the above

Q7. Calculate ΔG for the reaction X₂O_{4 (l)} → 2XO_{2 (g)} if ΔU = 2.1 kcal and ΔS = 20 cal K^-1 at 300°K.
a) 2.7 kcal
b) 9.3 kcal
c) – 2.7 kcal
d) – 9.3 kcal

Q8. What is the unit of entropy?
a) J mol^-1
b) J K mol^-1
c) J K^-1 mol^-1
d) J^-1 K^-1 mol^-1

Q9. For which of the following conditions a reaction will be spontaneous at all the temperature?
a) ΔH < 0 and ΔS < 0
b) ΔH < 0 and ΔS = 0
c) ΔH < 0 and ΔS > 0
d) both (b) and (c)

Q10. At which of the following temperatures the reaction Br_{2 (l)} + Cl_{2 (g)} → 2BrCl_(g) will be at equilibrium if ΔH = 30 kJ mol^-1 and ΔS = 170 J K^-1 mol^-1?
a) 273 K
b) 285.7 K
c) 300 K
d) 450 K

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By Team Learning Mantras