Acids are sour. They turn blue litmus red. Acids release hydrogen gas when reacting with some metals. Bases turn red litmus paper to blue. They taste bitter and are soapy. Salts are formed when acids react with bases, e.g. NaCl is formed by the reaction between NaOH (base) and HCl (acid). According to Arrhenius, acids dissociate in water to give hydrogen ions H+(aq) and bases ionize in an aqueous solution to produce hydroxyl ions OH–(aq). According to Brönsted-Lowry theory, acids are capable of donating an H+ ion and bases are capable of accepting an H+ ion.
1. Which of the following is a Lewis base?
(a) PF3
(b) BF3
(c) SiF4
(d) CF4
2. An aqueous solution of which of the following compounds will act as the best conductor of electricity?
(a) NH3
(b) HCl
(c) CH3COOH
(d) Fructose
3. Which of the following is not a Lewis base?
(a) NH3
(b) H2O
(c) OH–
(d) BF3
4. Which of the following is a Lewis acid?
(a) (CH3)3P
(b) (CH3)2O
(c) (CH3)3B
(d) (CH3)3N
5. Which of the following acts as a buffer?
(a) HNO2 and NaNO2
(b) HCl and KCl
(c) HNO3 and NH4NO3
(d) NaOH and NaCl
6. Which of the following compounds have the highest pH?
(a) Na2CO3
(b) CH3COOK
(c) NaNO3
(d) NH4Cl
7. Brine is an
(a) aqueous solution of Na2CO3
(b) aqueous solution of NaOH
(c) aqueous solution of NaHCO3
(d) aqueous solution of NaCl
8. Which of the following aqueous solutions will have the highest pH?
(a) NaHCO3
(b) NaCl
(c) NH4Cl
(d) Na2CO3
9. Which of the following is the strongest conjugate base?
(a) Cl–
(b) SO42-
(c) CH3COO–
(d) NO3–
10. Which of the following is not a Lewis base?
(a) PF3
(b) BF3
(c) F–
(d) CO
Answer
|
1. (a) |
2. (b) |
3. (d) |
4. (c) |
5. (a) |
|
6. (a) |
7. (d) |
8. (d) |
9. (c) |
10. (b) |
|
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