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MCQs

Total Questions : 217 | Page 1 of 22 pages
Question 1. The elements in which the outermost electrons are in the same principal quantum shell form the
  1.    isotopes
  2.    periods
  3.    rows
  4.    Diatic bonds
 Discuss Question
Answer: Option B. -> periods
Answer: (b).periods
Question 2. Hydrated Aluminum Chloride (AlCl₃) exists as
  1.    Al₂Cl₃
  2.    AlCl₃
  3.    Al₂Cl₆
  4.    AlCl₆
 Discuss Question
Answer: Option B. -> AlCl₃
Answer: (b).AlCl₃
Question 3. Another product of the reaction SiO₂(s) + NaOH(l) → Na₂SiO₃(aq) would be
  1.    HO₃⁺
  2.    OH⁻
  3.    H₂O(l)
  4.    H₂(g)
 Discuss Question
Answer: Option C. -> H₂O(l)
Answer: (c).H₂O(l)
Question 4. Oxygen has a higher electronegativity than
  1.    Silicon (Si)
  2.    Magnesium (Mg)
  3.    Chlorine (Cl)
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 5. Consider the reaction: Al₂O₃+NaOH + H₂O (l) → NaAl(OH)₄ (aq). The moles of NaOH required to balance the equation are
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Answer: (b).2
Question 6. The oxidation number of Argon upon reaction with oxygen is
  1.    0
  2.    +1
  3.    +2
  4.    +3
 Discuss Question
Answer: Option A. -> 0
Answer: (a).0
Question 7. The oxidation number for oxygen will always be
  1.    2
  2.    −2
  3.    1
  4.    -1
 Discuss Question
Answer: Option B. -> −2
Answer: (b).−2
Question 8. The formula Na₂O shows Na oxidation number to be
  1.    +1
  2.    +2
  3.    - 1
  4.    -2
 Discuss Question
Answer: Option A. -> +1
Answer: (a).+1
Question 9. The ions containing sulfur and oxygen are called
  1.    sulphide
  2.    sulfates
  3.    sulphur dioxide
  4.    sulfuric acid
 Discuss Question
Answer: Option B. -> sulfates
Answer: (b).sulfates
Question 10. The naming of compounds was given by German chemist
  1.    Alfred Stock
  2.    John
  3.    J.J Thomson
  4.    George Hallington
 Discuss Question
Answer: Option A. -> Alfred Stock
Answer: (a).Alfred Stock

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