9. Delta G gives a criteria for spontaneity at a given temperature and pressure.
ID: 700351 • Letter: 9
Question
9. Delta G gives a criteria for spontaneity at a given temperature and pressure.
If delta G is negative, the process is spontaneous.
If delta G is positive, the process is non spontaneous.
Ans. (a)
10. Ans(a)The above process of synthesis of ammonia is called Haber's process.
In this case, catalyst increases the rate of synthesis of ammonia.
11. Ans(a) It follows from Le Chatelier's principle.
12. Ans(b) HNO3 is a strong acid. All the other given acids are weak acids.
13.pOH= -log[OH-]
So, pOH= -log[10-5] =5
pH + pOH =14 => pH = 14 - pOH => pH = 14 - 5 = 9(C) Ans.
14. pH = -log[H3O+]
So, 4 = -log[H3O+]
or, [H3O+] = 10-4(b) Ans.
15. Ans(c) Salt of weak acid CH3COOH and its salt with strong base NaOH.
16. Ans(d) BH3 contains 6 electrons about its central atom. Rest others have their octet complete about the central atom.
17. Ans. (c) Phosphorous has vacant d-orbitals. Others do not have d-orbitals.
18. Ans. (e)
19. Ans (a) Fact
20.Ans(b)
Explanation / Answer
9, A reaction with a negative G will be a. always spontaneous b. never spontaneous c.may be spontaneous 10. The reaction + 3H2 2NH, is at equilibrium. Adding a catalyst will a. form more ammonia b. form more N c. form more H, d. do nothing a form more ammonia 11. In the reaction from question 10, removing some ammonia from the reactor wil d. do nothing b. form more N c. form more H 12. Which of the following acids completely dissociates in water? a. CH,COOH b. HNO c. HF d. H,SO 13, What is the pH of a 1.0x 10 M solution of NaOH? a. 5 c. 9 d. 14 14. What is the [H,O"] of a HCI solution with a pH of 4.00 a. 4.00 M b. 1x 10 M c. 1x10 M d. 1x 10 M 15. Which of the following solutions is a buffer? a. HCI, NaCI b. HNO, KNO, cCH,COOH, CHsCOONa d. NaOH, NaCI 16. Which compound or ion contains less than an octet about the central atom? a. CHs b. NH d. BH 17. Compounds of which element can have an expanded octet about the central atom? a nitrogen b. oxygen c. phosphorus d. fluorine 18. Which ion can be written with two or more resonance structures? a. ammonium b. chloride c. bromide d. sulfide e. carbonate 19. Oxidization refers to a. loss of electrons b. burning in oxygen gain of electrons d.gain of protons 20. Using VSEPR theory, what is the molecular geometry BF,? a. linear b. trigonal planar c. bent d. tetrahedral e. trigonal pyramidal
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