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MCQs

Total Questions : 212 | Page 3 of 22 pages
Question 21. In neutralization reactions, instead of pH meter,
  1.    barometer should be used
  2.    gas syringe shall be used
  3.    data loggers are a better choice
  4.    heat sensors should be used
 Discuss Question
Answer: Option D. -> heat sensors should be used
Answer: (d).heat sensors should be used
Question 22. Washing soda is
  1.    acidic
  2.    alkaline
  3.    neutral
  4.    basic
 Discuss Question
Answer: Option B. -> alkaline
Answer: (b).alkaline
Question 23. Digestive fluids in stomach has a pH of
  1.    0
  2.    2
  3.    4
  4.    6
 Discuss Question
Answer: Option B. -> 2
Answer: (b).2
Question 24. Amphoteric oxides include
  1.    K₂O
  2.    CO₂
  3.    SO₂
  4.    Al₂O₃
 Discuss Question
Answer: Option D. -> Al₂O₃
Answer: (d).Al₂O₃
Question 25. OH- ions are produced by
  1.    alkalis
  2.    acids
  3.    water
  4.    none of the alkalis and acids
 Discuss Question
Answer: Option A. -> alkalis
Answer: (a).alkalis
Question 26. NaOH + HCl →
  1.    Na(OH)₂ + H₂
  2.    NaCl + H₂
  3.    NaCl + H₂O
  4.    NaCl + H₂ + O₂
 Discuss Question
Answer: Option C. -> NaCl + H₂O
Answer: (c).NaCl + H₂O
Question 27. Phosphoric acid has formula
  1.    H₂PO₃
  2.    H₂PO₄
  3.    H₃PO₄
  4.    H₃PO₃
 Discuss Question
Answer: Option C. -> H₃PO₄
Answer: (c).H₃PO₄
Question 28. Acids (H+) reacts with metal hydroxides (-OH-) to from
  1.    salt and water
  2.    salt and hydrogen gas
  3.    salt and hydrogen oxides
  4.    salt and alkali
 Discuss Question
Answer: Option A. -> salt and water
Answer: (a).salt and water
Question 29. In Universal indicators, red color shows
  1.    strong acids
  2.    strong alkalis
  3.    weak acids
  4.    weak bases
 Discuss Question
Answer: Option A. -> strong acids
Answer: (a).strong acids
Question 30. Bases (OH-) are
  1.    corrosive
  2.    turn litmus from blue to red
  3.    turn litmus from red to blue
  4.    non-metal oxides
 Discuss Question
Answer: Option C. -> turn litmus from red to blue
Answer: (c).turn litmus from red to blue

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