Doubts
Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents
Sign in to save progress →
Doubts
Sign in

Thermodynamics question

2021 · 26 Feb · Shift 2 · Q20
Guest · try one question or challengeGuest · try one question or challenge
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Thermodynamics
  5. /2021 · 26 Feb · Shift 2 · Q20

Thermodynamics question

2021 · 26 Feb · Shift 2 · Q20

JEE MainChemistryThermodynamicsNumerical+4 / −1
The average S-F bond energy in kJ mol −-− 1 of SF6SF_6SF6​ is ‾\underline{\hspace{2cm}}​. (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF6SF_6SF6​(g), S(g) and F(g) are - 1100, 275 and 80 kJ mol −-− 1 respectively.]
Numerical answer
PreviousNext

More from Thermodynamics

  • 200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is − 57.1 kJ. The increase in temperature in ∘ C of the system on mixing is x × 10 − 2. The value of x is ​…2021 · Numerical
  • Two flasks I and II shown below are connected by a valve of negligible volume. When the valve is opened, the final pressure of the system in bar is x × 10 − 2. The value of x is ​. (Integer answer) [Assume… Includes diagram2021 · Numerical
  • Data given for the following reaction is as follows : FeO(s) + C(graphite) → Fe(s) + CO(g) The minimum temperature in K at which the reaction becomes spontaneous is ​. (Integer answer) Includes table2021 · Numerical
  • For water at 100 ∘ C and 1 bar, Δ vap H −Δ vap U = ​× 102 J mol − 1. (Round off to the Nearest Integer) [Use : R = 8.31 J mol − 1 K − 1] [Assume volume of H2​O(l) is much smaller…2021 · Numerical
  • When 400 mL of 0.2 M H2​SO4​ solution is mixed with 600 mL of 0.1 M NaOH solution, the increase in temperature of the final solution is ​× 10 − 2 K. (Round off to the nearest integer). [Use : H+ (aq)…2021 · Numerical
  • The incorrect expression among the following is :2021 · MCQ
  • The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100oC is ​. (Given : Δ Hvap for water at 373 K = 41 kJ/mol, R = 8.314 JK–1 mol–1)2020 · Numerical
  • The heat of combustion of ethanol into carbon dioxide and water is – 327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27oC (if all gases behave ideally) is (R = 2 cal mol–1 K–1) ​.2020 · Numerical