Which of the following is true for a system at equilibrium? A) Delta S degree sy

Question

Which of the following is true for a system at equilibrium? A) Delta S degree sys = Delta S degree surr B) Delta S degree sys = - Delta S degree surr C) Delta S degree sys = Delta S degree surr = 0 D) Delta S degree univ > 0 E) Delta S degree sys > 0 Companying with a nuclear reaction, huge amount of energy will be release Which of the following describe should be true? A) It does not concern with any thermodynamic Law. B) It against with the first thermodynamic Law. C) It still obeys with all thermodynamic Law. D) Due to the mass lose, it convert to energy according the equation E = MC^2. E) Energy is not conserved for nuclear reaction. Which, if any, of the following processes should be spontaneous under the specified conditions? A) H_2O_(1) rightarrow H_2O_(s) at - 10 degree C B) CO_2(s) rightarrow CO_2(g) at 0 degree C C) 2H_2O_(g) rightarrow 2H_2(g) + O_2(g) at 120 degree C D) C(graphite) rightarrow C(diamond) at 25 degree C and 1 atm pressure. E) CO_2(s) rightarrow CO_2(g) at 20 degree C Please choose the suitable description for acid-base indicator? A) The quantity of acid form of indicator is more than the pKb of basic one. B) The quantity of acid form of indicator is equal to the pKb of basic one. C) The magnitude of color change of acid-base indicator is established in two units of pH value. D) The quantity of acid form of indicator is less than the pKb of basic one. E) None of the above. What factors can descript of universal indicator? (A) No buffer system was in the in the universal indicator. (B) No pH gradient was established in the universal indicator.

Explanation / Answer

At equilibrium entropy is maximum for an isolated system. since if entropy is increased, the system is not at equilibrium and a decrease in entorpy is violation of second law of thermodynamics. hence E is correct.

2. There is mass defect during nuclear reaction and this mass defect gets converted into energy. D is correct.

3. For a spontaneous process, entropy increases. Entropy is degree of disorder. hence when a solid becomes a gas, the degree of disorder increases. Similalry, when there is an increase in number of moles during the course of reaction, there is an increase in entropy. Accordingly, B,C and E are correct answers.

4. acid base indicators are weak acids or bases which change their color when there is a change in pH. The quantity of acid form of indicator is equal to Pkb of base.

5. A universal indicator is a pH indicator that contains compounds of several solutions which change their pH smoothly over a pH value range from 1 to 14 . Hence both A and B are incorrect.

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