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MCQs

Total Questions : 273 | Page 3 of 28 pages
Question 21. Combining Copper(I) (Cu+) with Oxygen (O₂) results in
  1.    CuO
  2.    Cu₂O
  3.    CuO₂
  4.    Cu(OH)₂
 Discuss Question
Answer: Option B. -> Cu₂O
Answer: (b).Cu₂O
Question 22. Percentage of an element can be calculated through
  1.    relative atomic mass of the element in the formula/relative molecular mass of the element
  2.    relative atomic mass of the element in the formula/relative molecular mass of the compound
  3.    structural formula
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 23. Compounds are not formed by elements
  1.    which are non-metals
  2.    which are metals
  3.    which have zero valency
  4.    which have radicals
 Discuss Question
Answer: Option C. -> which have zero valency
Answer: (c).which have zero valency
Question 24. In Calcium Chloride, percentage composition of Calcium is
  1.    0.4621
  2.    0.3722
  3.    0.4621
  4.    0.36112
 Discuss Question
Answer: Option D. -> 0.36112
Answer: (d).0.36112
Question 25. Charge on Sulphur can be
  1.    2 or 4
  2.    4 or 6
  3.    3 or 5
  4.    2 or 3
 Discuss Question
Answer: Option B. -> 4 or 6
Answer: (b).4 or 6
Question 26. Valency of carbonate ion CO₃? is
  1.    -1
  2.    -2
  3.    -3
  4.    -4
 Discuss Question
Answer: Option A. -> -1
Answer: (a).-1
Question 27. Formula of hydrated Sodium Carbonate is
  1.    Na(HCO₃)₂
  2.    Na₂CO₃.(H₂O)₅
  3.    Na₂CO₃.10H₂O
  4.    Na3CO₄.10H₂O
 Discuss Question
Answer: Option C. -> Na₂CO₃.10H₂O
Answer: (c).Na₂CO₃.10H₂O
Question 28. All of these radicals have a valency of 2, except
  1.    SO₄
  2.    CO₃
  3.    NH₄
  4.    MgCO₃
 Discuss Question
Answer: Option C. -> NH₄
Answer: (c).NH₄
Question 29. All are covalent compounds except
  1.    NO₂
  2.    SO₃
  3.    SO₂
  4.    HNO₃
 Discuss Question
Answer: Option D. -> HNO₃
Answer: (d).HNO₃
Question 30. Empirical formula is the
  1.    simplest formula
  2.    molecular formula
  3.    chemical formula
  4.    ionic exponential formula
 Discuss Question
Answer: Option A. -> simplest formula
Answer: (a).simplest formula

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