Class 11 Chemistry · Chapter 9 · Test 1
Acids, Bases, Salts
37 MCQ
37 questions · 30 min · 37 marks
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Sample questions
The first 5 of 37. Try each one, then tap to see the answer.
Question 1
Given NH3(g) + H2O(l) <-> NH4+(aq) + OH-(aq) which statement is correct?
- ANH3 is the acid and H2O is the base.
- BNH3 is the base and H2O is the acid.
- CNH4+ is the base and OH- is the acid.
- DH2O is the base and OH- is the acid.
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Answer: B
H2O donates a proton so it is the acid and NH3 accepts it so it is the base.
Question 2
The pH of 10^-3 mol dm-3 of an aqueous solution of H2SO4 is:
- A3.0
- B2.7
- C2.0
- D1.5
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Answer: B
H2SO4 is strong and its first ionization is complete and the second step (Ka = 1.3 x 10^-2) adds some more H+ so [H+] is a little above 10^-3 and the pH is about 2.7.
Question 3
The solubility product of AgCl is 2.0 x 10^-10 mol2 dm-6. The maximum concentration of Ag+ ions in the solution is:
- A2.0 x 10^-10 mol dm-3
- B1.41 x 10^-5 mol dm-3
- C1.0 x 10^-10 mol dm-3
- D4.0 x 10^-20 mol dm-3
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Answer: B
Ksp = [Ag+][Cl-] = S^2 so S = square root of 2.0 x 10^-10 = 1.41 x 10^-5 mol dm-3.
Question 4
Which indicator is typically used for titrations involving strong acids and strong bases?
- AMethyl red
- BPhenolphthalein
- CBromothymol blue
- DLitmus solution
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Answer: B
The text says phenolphthalein can be used for the strong acid-strong base titration as it shows different colours in the steep pH range.
Question 5
Which of the following is the conjugate base of water?
- AOH-(aq)
- BH+(aq)
- CH2O(l)
- DH3O+(aq)
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Answer: A
When water donates a proton it forms OH- so OH- is the conjugate base of water.
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