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MCQs

Total Questions : 273 | Page 2 of 28 pages
Question 11. Spectator ions,
  1.    take active part in forming new products
  2.    remain chemically unchanged in an ionic equation
  3.    act as catalysts
  4.    form suspensions in the liquid
 Discuss Question
Answer: Option B. -> remain chemically unchanged in an ionic equation
Answer: (b).remain chemically unchanged in an ionic equation
Question 12. Valency of nitrogen can be
  1.    2 or 4
  2.    4 or 6
  3.    3 or 5
  4.    2 or 3
 Discuss Question
Answer: Option C. -> 3 or 5
Answer: (c).3 or 5
Question 13. Valency of Phosphate ion PO₄ is
  1.    -1
  2.    -2
  3.    -3
  4.    -4
 Discuss Question
Answer: Option C. -> -3
Answer: (c).-3
Question 14. Al+3 indicates that
  1.    it needs -3 valency to become stable
  2.    it has high positive charge
  3.    Aluminum is found in Group-II
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 15. In one molecule of Sulfuric Acid (H₂SO₄),
  1.    one ion of hydrogen combines with one ion of sulphate
  2.    two ions of sulphate combine with one ion of hydrogen
  3.    two ions of hydrogen combine with one ion of sulphate
  4.    two ions of hydrogen combine with two ions of sulphate
 Discuss Question
Answer: Option C. -> two ions of hydrogen combine with one ion of sulphate
Answer: (c).two ions of hydrogen combine with one ion of sulphate
Question 16. Phosphorus can have a valency of
  1.    2 or 4
  2.    4 or 6
  3.    3 or 5
  4.    2 or 1
 Discuss Question
Answer: Option C. -> 3 or 5
Answer: (c).3 or 5
Question 17. In writing chemical equations, inclusion of state symbols shall be done while
  1.    correct chemical formulae of reactants and products are written
  2.    the equation is being balanced to fulfill the law of conservation of mass
  3.    the equation has been balanced
  4.    the chemical formulae of products and reactants have been changed to bring about quick balancing
 Discuss Question
Answer: Option C. -> the equation has been balanced
Answer: (c).the equation has been balanced
Question 18. Valency of all these ions is negative 1, except
  1.    OH
  2.    PO₄
  3.    NO₃
  4.    Br
 Discuss Question
Answer: Option B. -> PO₄
Answer: (b).PO₄
Question 19. Plumbum is Latin name of
  1.    Potassium
  2.    Lead
  3.    Copper
  4.    Valium
 Discuss Question
Answer: Option B. -> Lead
Answer: (b).Lead
Question 20. In magnesium oxide, magnesium ion requires only one oxygen ion because
  1.    the valency of oxygen is −1
  2.    the valency of Oxygen is −2
  3.    the valency of magnesium is +1
  4.    the formula of magnesium oxide is 2MgO
 Discuss Question
Answer: Option B. -> the valency of Oxygen is −2
Answer: (b).the valency of Oxygen is −2

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