AE UNIVERSITY 1) What is the conjugate base of OH- A) O B)o- C) Ho 2) Which of t

Question

AE UNIVERSITY 1) What is the conjugate base of OH- A) O B)o- C) Ho 2) Which of the following salts when dissolved in water will give a neutral solutio A) KBr B) CaFs C)NaHCO D)NHNO 3) Which of the following acids is the strongest acid A) HBrO Ka-8.6) C) HCN pk-9.3) B) HNO: (pk-33) D) HCIO (pKa-7.2) .0 in which [OH ] is 0.0250 M c)74 4) What is the pH of an aqueous solution at 25 A) 2.60 B) 3.60 D) 12.4 5) The hydride ion, H is a stronger base than the the reaction of hydride ion with water is ide ion, OH The product(o)cf B) OH (a)+He) D)2OH (aq) C OH (ag)+2H'(ag) 6) Ammonia (NHs) is a weak base; the equilibrium reaction of which with water is given by NHs (aq) +H:O (DNHa (aq)+OH (ag) A) [NH4+]-1.0 M C) [NH4+] > [OH-] Which of the following is true for 1.0 M ammonia solution at equilibrium B) [OH11.0M If [ H'] in water is 2.3 x107 M at 50 °C, what is the Kw value D)4.6 x10 B)7.5x1011C)5.3 x10 D)4.6x10 A) 1x10-14 The pKb of a weak base is 7.05. What is the K for its conjugate acid c) 1.12 × 10" D) 66×104 B)4.3 x10 A)2.1x 10

Explanation / Answer

Q1 Option (D) is correct answer. Conjugate base of OH- is O2- as shown below

OH- --------> H+ + O2-

Q2. A salt formed by strong base and strong acid gives a neutral solution. Hence option (a) is correct answer. KBr is formed by reaction of a strong acid (HBr) with strong base (KOH). CaF2 is formed by a strong base ( Ca(OH)2)and a weak acid HF. NaHCO3 is formed by strong base (NaOH) and weak acid (H2CCO3) similarly NH4NO3 is formed by weak base (NH4OH) and strong acid (HNO3).

Q3. Smaller the pKa stronger is the acid. Hence option (B) is correct answer. HNO3 is stronger acid.

Q4. OH- concentration = 0.0250M

Hence pOH = -log[OH-] = -log(0.025) = 1.6

pH + pOH = 14

pH = 14 - 1.6 = 12.4, Hence option (D) is the correct answer.

Q5. Since H- is stronger base it will accept H+ from water tp form H2 gas and OH-(aq). Hence option (B) is the correct answer.

Q6. Option (B) is the correct answer. Since NH3 is a weak base it will not dissociate completely. Hence 1.0M of NH3 will not produce 1.0M of OH-.

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