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Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q. Vapour pressure of NH4HS (s)is 20 mm at 25°C, for

Total pressure when NH4HS (s) dissociates at 25°Cin a vessel which already contains H2S (g)at a pressure of 15 mm, is
  • a)
    25 mm
  • b)
    50 mm
  • c)
    5 mm
  • d)
    10 mm
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Direction (Q. Nos. 1-10) This section contains 10multiple choice quest...
The correct answer is Option A.
   NH4HS   ------->  NH3 + H2S
Let P be the pressure at eq. of NH3 and H2S.
Therefore, Kp = P2
= (20 / 2)2
= 100 mm
= 100
Also, Kp = (15 + P) (P)
100 = 15 P + P2
P2 + 15 P – 100 = 0
P = 5
Total pressure = 15 + 2(P)
= 15 + 2(5)
= 25 mm
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Direction (Q. Nos. 1-10) This section contains 10multiple choice quest...
°C. If the heat of sublimation of NH4HS(s) is 40 kJ/mol, what is the vapour pressure of NH4HS at 50°C?

(a) 20 mm
(b) 40 mm
(c) 80 mm
(d) 160 mm
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Direction (Q. Nos. 1-10) This section contains 10multiple choice questions. Each question has fourchoices (a), (b), (c) and (d), out of which ONLY ONE option is correct.Q. Vapour pressure of NH4HS (s)is 20 mm at 25°C, forTotal pressure when NH4HS (s) dissociates at 25°Cin a vessel which already contains H2S (g)at a pressure of 15 mm, isa)25 mmb)50 mmc)5 mmd)10 mmCorrect answer is option 'A'. Can you explain this answer?
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Direction (Q. Nos. 1-10) This section contains 10multiple choice questions. Each question has fourchoices (a), (b), (c) and (d), out of which ONLY ONE option is correct.Q. Vapour pressure of NH4HS (s)is 20 mm at 25°C, forTotal pressure when NH4HS (s) dissociates at 25°Cin a vessel which already contains H2S (g)at a pressure of 15 mm, isa)25 mmb)50 mmc)5 mmd)10 mmCorrect answer is option 'A'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Direction (Q. Nos. 1-10) This section contains 10multiple choice questions. Each question has fourchoices (a), (b), (c) and (d), out of which ONLY ONE option is correct.Q. Vapour pressure of NH4HS (s)is 20 mm at 25°C, forTotal pressure when NH4HS (s) dissociates at 25°Cin a vessel which already contains H2S (g)at a pressure of 15 mm, isa)25 mmb)50 mmc)5 mmd)10 mmCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction (Q. Nos. 1-10) This section contains 10multiple choice questions. Each question has fourchoices (a), (b), (c) and (d), out of which ONLY ONE option is correct.Q. Vapour pressure of NH4HS (s)is 20 mm at 25°C, forTotal pressure when NH4HS (s) dissociates at 25°Cin a vessel which already contains H2S (g)at a pressure of 15 mm, isa)25 mmb)50 mmc)5 mmd)10 mmCorrect answer is option 'A'. Can you explain this answer?.
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