Chemistry

Change in enthalpy for reaction, 2H₂O₂ → 2H₂O + O₂ if heat of formation of H₂O₂ and H₂O are -188 and -286 kJ/mol respectively,is

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(a) -196 kJ/mol (b) ⁺196kJ/mol (c) ⁺948 kJ/mol (d) […]

At 27⁰C latent heat of fusion of a compound is 2930 J/mol. Entropy change is

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(a) 9.77 J/mol-K (b) 10.77 J/mol-K (c) 9.07 J/mol-K (d) 0.977 J/mol-K

Correct Answer:

9.77 J/mol-K

Explanation:

No […]

Cell reaction is spontaneous when

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(a) ΔG⁰ is negative (b) ΔG⁰ is positive (c) ΔE⁰ Red is positive (d) ΔE⁰Red is negetive

Correct Answer:

ΔG⁰ is negative

Explanation:

For a cell reaction to […]

For the reaction C₂H₅OH + 3O₂(g) → 2CO₂(g) + 3H₂O which one is true

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(a) ΔH = ΔE – RT (b) ΔH = ΔE +RT (c) ΔH = ΔE + 2RT (d) ΔH […]

For the cell reaction Cu²⁺ (C₁.aq) + Zn(s) = Zn²⁺(C₂.aq ) + Cu(s) of an electrochemical cell, the change in free Energy (ΔG) at a given temperature is a function of

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(a) ln […]

One mole of an ideal gas at 300 K is expanded isothermally from an initial volum of 1 litre to 10 litres .The ΔE for this process is

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(a) 138.1 cal (b) zero […]

Which of the following is the correct equation

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(a) ΔU = ΔW + ΔQ (b) ΔU = ΔQ + W (c) ΔW = ΔU +ΔG (d) none of these

Correct Answer:

ΔU = […]

For a reaction to occur spontaneously

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(a) ΔH must be negative (b) ΔS must be negative (c) (ΔH-TΔS) must be negative (d) (ΔH+TΔS) must be negative

Correct Answer:

(ΔH-TΔS) must be negative

Explanation: […]

At standard state Gibb’s free energy change for isomerization reaction cis-2-pentene⇌trance-2-pentene is -3.67 kJ/mol at 400K. If more trans-2-pentene is added to the reaction vessel then

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(a) equilibrium remains unaffected (b) equilibrium is […]