Question

Q(7) The reaction system POBr3(g) - POBr(g) + Brz(g) is at equilibrium. Which of the following statements describes the behavior of the system if POBr is added to the container? A) The reverse reaction will proceed to establish equilibrium. B) The partial pressures of POBra and POBr will remain steady while the partial pressure of bromine increases. C) The partial pressure of chlorine will increase while the partial pressure of POB decreases. D) The partial pressure of chlorine remains steady while the partial pressures of POBr3 and POBr increase E) The forward reaction will proceed to establish equilibrium. Q(8) What is the name of a proton donor in a reaction? A) Arrhenius acid B) Bronsted-Lowry base C) Arrhenius base D) Lewis base E) Bronsted-Lowry acid Q(9) After a substance acting as a strong base reacts, what remains of the base? A) A weaker base B) A strong acid C) A strong conjugate acid D) A weak conjugate acid E) A strong conjugate base Q(10) What is the conjugate base of NH3? A) NH2 B) NH2 C) NH2 R D) NH4 E) NH4 Q(11) What is the [H3O'] for a solution at 25°C that has pOH = 5.640? A) 2.34 * 10-M D) 4.27* 10 M B ) 2.29 * 10- M E ) 8.360 M C) 4.37" 10.M Q(12) Acid strength increases in the series: HCN <HF <HSO4. Which of these species is the strongest base? A) H2SO4 B ) SO42- C) F- D) CN- E) HSO4- Q(13) A diprotic acid has two dissociation constants Kua for the first proton and Kaa for the second proton. Which is the relationship between the two Ka? A) K1a>Ka B) K1a<K2a C) K1a=K2a D) K1a<< Ka E) It cannot be determined Q(14) A 1.25 M solution of the weak acid HA is 9.2% dissociated. What is the pH of the solution? A) 0.64 B) 0.94 C) 1.13 D) 2.16 E) None of these choices is correct. Q(15) What is the effect on equilibrium when sodium formate is added to a solution of formic acid? A) No change in the equilibrium B) Equilibrium shifts to the right C) More information is needed to answer the question. D) Equilibrium shifts to the left. Q(16) What is the effect on equilibrium when sodium acetate is added to a solution of acetic acid? CH3COOH(aq) --H(aq) CH3COO (aq)

Answer 1

Q7 I POBra (gi hecho 'Pobra (g. - I POBO (g) + 1 Brzigi Pobo ig) is added no. of moles of Pobo will an and press we will also gnevuse. So according to chateliere principle Reaction will buoceed in Back Reaction To Decuase the press wee as well as conanman of Pobo more po B&B (g) will be formed obton- (A) Reverse Reacion will proceed to estabiush equilbrium is loweet Answer. 9-8 What is name of proton donor НА — нө +до & Bronsted - Lowry Theory is expansion of authenius Theory Acid proton Donor = add Ho to solvent Base 3 Prolon Arceptor =) de maus Ho from solen op Hon - (5) Boundled howey Add is www Answer

option - (D) weak congly "-10) weak conjugare aid is Louret Ans were for example strong Naoh Basel Naon t rich Nacht 420 Conjugare Aria Strong Base 840 wnjugare Base of NH3 ise NHY yere Conjugare Base add H@ to NHS for conjugate Aid Remowe Ho. to option- (E) - NHTW is wowut Ansula ( Q-11 pH = -log (H30+) pH t por= 14 p [H3 = 14- P[on] = þ[HJ = 14 - 5.640 DHI - 836 - log [H3O+] = 8.36 log (130 t] = -8.36 CH3ot) = 10-8:36 = (4.36 * 10-9 option - (c) is correct Answer