Self-test questions: Chapter 07

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In the reaction between sulfuric acid and calcium hydroxide to form calcium sulfate and water, the sulfate anion and the calcium cation are known as?

Spectator ions

Inactive ions

Noble ions

Neutralisation ions

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What is the conjugate base of the acid H₂C₂O₄?

H₃C₂O₄⁺

HC₂O₄^-

C₂O₄^2-

OH^-

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What is the conjugate acid of NH₂^-?

NH₃

NH^2-

NH₄⁺

NH₂

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What is the pH of a 0.213 mol dm^-3 solution of HBr?

0.67

-0.67

0.37

1.67

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What is the pH of a 0.215 mol dm^-3 carbonic acid solution?

3.5

0.67

4.17

2.29

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For a conjugate acid-base pair, how does K_w relate to K_aand K_b

Ka x Kb = Kw

Ka + Kb = Kw

Kb/Ka = Kw

Ka-Kb = Kw

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In a titration involving HCl and NaOH, the equivalence point occurs at what pH?

10

7

5

3

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What is the pH of a solution when 6.2 cm³ of an 0.25 mol dm^-3 solution of NaOH is added to 20 cm³ of 0.2 mol dm^-3 solution of HCl?

1.25

0.75

1.50

1.75

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What would be a good choice of indicator for the reaction of ethanoic acid and sodium hydroxide?

Thymol blue

Methyl red

Bromophenol blue

phenolphthalein

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Which of the following elements forms an acidic oxide?

Bi

P

Sr

Na

Self-test questions: Chapter 07

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