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Tutor profile: Dev S.

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Dev S.
Teacher for 9 years in Chemistry
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Questions

Subject: Physical Chemistry

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Question:

Q: 70 gms of nitrogen gas was initially at 50 atm and 25°C a) It was allowed to expand isothermally against a constant external pressure of one atmosphere. Calculate, U, Q and W assuming the gas to behave ideally. b) Also find out the maximum work that would be obtained if the gas expanded reversibly and isothermally to one atmosphere.

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Dev S.
Answer:

Solutioon a) Amount of gas n = 70/28 = 2.5 moles Initial pressure; P1 = 50 atm Final pressure P2 = 1 atm R = 8.314J/K/mol =2 cal/K/mol T =(25 +273)K = 298K Since the gas is ideal, U = 0, as the temperature is constant. The work obtained w = P2 (V2 – V1) V2= nRT/P2 & V1= nRT/P1 on solving, w = 1.5 Kcal Solution b) b) The maximum work for its isothermal reversible expansion. W = nRT ln P1/P2 = 2.303 nRT ln P1/P2 on solving, W = 5.8 Kcal

Subject: Organic Chemistry

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Question:

Which of the following has the most acidic hydrogen ? 1. 3-Hexanone 2. 2, 4-Hexanedione 3. 2, 5-Hexanedione 4. 2, 3-Hexanedione

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Dev S.
Answer:

Answer is b) Explanation: H atom at C-3 is sandwiched between to Electron Withdrawing Groups (EWG), ketone C=O at alpha position wrt these groups. Hence resulting conjugate base formed after removal of H atom from C-3 will be most stabilized due -I and -R effect of tow ketone groups.

Subject: Inorganic Chemistry

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Question:

Q: The Property of hydrogen which distinguishes it from other alkali metals a) Its electropostive character b) Its affinity for non metals c) its reducing character d) its non metallic character

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Dev S.
Answer:

answer is d) its non metallic character

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