If a reaction has delta G degree greater than zero, then the equilibrium constan

Question

If a reaction has delta G degree greater than zero, then the equilibrium constant will be (a) Negative (b) Less than 1 but greater than zero (c) Greater than 1 (d) We need to know what the reaction is in order to answer this. For a reaction that has a positive value of delta H degree and a negative value of delta S degree, which statement is true at equilibrium? a) Reactants are favored at very low temperatures and reactants are favored at very high T b) Reactants are favored at very low temperatures and products are favored at very high T. c) Products are favored at very low temperatures and reactants are favored at very high T d) Products are favored at very low temperatures and products are favored at very high T If the entropy of an isolated system increases in a process, then the final state of the system (a) has a greater probability than the initial state. (b) has a smaller probability than the initial state. (c) There is no relation between entropy and probability. Give the coordination number of Ni in [Ni(en)Cl_2]^+ While a chemical reaction is going on (before equilibrium has been reached), which statement is true? (a) The entropy of the system must be decreasing. (b) The entropy of the system must remain constant. (c) The entropy of the system must be increasing. (d) The entropy of the universe must be decreasing. (e) The entropy of the universe must remain constant. (f) The entropy of the universe must be increasing.

Explanation / Answer

5. dG = -2.303RT log K

if dG > 0 then K = 10^-(dG/2.303RT)

so K > 0 and K < 1

Answer : B

6. dG = dH - T dS

if dH > 0 and dS < 0 then dG = positive

So dG > 0 then K > 0 and K < 1

Hence reactants are favoured at low temperature and products are formed at high temperatue.

Answer : B

7. If entropy increases then particles are higher energy than initial state. So the probability decreases than initial state.

Answer : B

8. [Ni (en) Cl2]^+

Cl is a monodentate ligand so they can donate one lone pair of electrons each.

en is a bidentate ligand so it can donate two lone pair of electrons.

So Ni accepts toatlly Four lone pairs of electrons hence co-ordination number is 4

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