Consider the following statements I. Standard heat of formation of N_2O , NO_2 and N_2O_4 is negative II. Standard heat of formation of all nitrogen oxide is positive in all physical states at 25°C. III. Standard Molar Entropy ofNH_3 (aq) is less than NH_3 (g) IV. If \Delta_f^\circG for NH_3 (g) and NH_3 (aq) are –46.11 kJ/mol and –80.29 kJ/mol and conversion of NH_3 (g) to NH_3 (aq) is spontaneous then this reaction is enthalpy driven. V. Standard heat of formation of N_2O_5 in all physical states at 25 °C are negative Select the incorrect statements

Correct Answer is : Only I, II and V

JEE Advanced Model Paper 10 with solutions for online practice

PARAGRAPH 1

For many decades scientists believed that only energy releasing process could be occured by own accord, it might be due to decrease in energy. But some energy absorbing process yet occurred spontaneously e.g. melting of ice, evaporationof water. This led to need of researching another driving force that affects the spontaneity. This factor is known as entropy change. Entropy is thermodynamic state function, that is related with the randomness. The concept of entropy suggests that everyspontaneous process increases the entropy of universe.
For every reversible change, entropy of system is equal to heat absorbed or released divided by the absolute temperature ΔS =

Question : 34 of 54

Marks: +1, -0

Consider the following statements
I. Standard heat of formation of N2O , NO2 and N2O4 is negative
II. Standard heat of formation of all nitrogen oxide is positive in all physical states at 25°C.
III. Standard Molar Entropy ofNH3 (aq) is less than NH3 (g)
IV. If Δf°G for NH3 (g) and NH3 (aq) are –46.11 kJ/mol and –80.29 kJ/mol and conversion of NH3 (g) to NH3 (aq) is spontaneous then this reaction is enthalpy driven.
V. Standard heat of formation of N2O5 in all physical states at 25 °C are negative
Select the incorrect statements

Only I, II and III
Only II and V
Only I, II and V
Only II, IV and V

Validate

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