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Lesson 2 – Acids, Bases, Salts, Oxides and pH Scale — Lesson quiz

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  • Questions count: 3
  • Passing grade: 60%
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1.
Which of the following solutions has the lowest pH value (strongest acidity) at equal concentration?
NH₄OH
NaCl
HCl
CH₃COOH
2.
Phenolphthalein indicator cannot distinguish between an acidic solution and a neutral solution because:
It precipitates in both
It is red in both
It is colorless in both
It is blue in both
3.
Which of the following oxides is amphoteric?
ZnO
Na₂O
SO₃
MgO
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