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MCQs

Total Questions : 350 | Page 8 of 35 pages
Question 71. The units of concentration is
  1.    moldm⁻³
  2.    moldm⁻³s⁻¹
  3.    dm³mol⁻¹
  4.    dm³mol⁻¹s⁻¹
 Discuss Question
Answer: Option A. -> moldm⁻³
Answer: (a).moldm⁻³
Question 72. Changes in electrical conductivity during reactions is due to
  1.    ions production only
  2.    free electrons only
  3.    free protons
  4.    ions productions and free electrons
 Discuss Question
Answer: Option D. -> ions productions and free electrons
Answer: (d).ions productions and free electrons
Question 73. Reactions which take place on 10⁻¹⁴ to 10⁻¹⁵ seconds are termed as
  1.    Nano chemistry
  2.    Femtochemistry
  3.    Microchemistry
  4.    Biochemistry
 Discuss Question
Answer: Option B. -> Femtochemistry
Answer: (b).Femtochemistry
Question 74. Stopped flow spectrophotometry is use to monitor course of
  1.    fast reactions
  2.    slow reactions
  3.    equilibrium reactions
  4.    reversible reactions
 Discuss Question
Answer: Option A. -> fast reactions
Answer: (a).fast reactions
Question 75. A colorimeter helps to measure in a reaction mixture its
  1.    progress
  2.    reactants
  3.    products
  4.    temperature
 Discuss Question
Answer: Option A. -> progress
Answer: (a).progress
Question 76. The positive charge on the nucleus down the group II
  1.    increases
  2.    decreases
  3.    remains same
  4.    varies depending on atomic size
 Discuss Question
Answer: Option A. -> increases
Answer: (a).increases
Question 77. When an electron enters into the outermost shell of fluorine, it experiences
  1.    least shielding from the positive nuclear charge
  2.    most shielding from the positive nuclear charge
  3.    least shielding from the negative nuclear charge
  4.    most shielding from the negative nuclear charge
 Discuss Question
Answer: Option A. -> least shielding from the positive nuclear charge
Answer: (a).least shielding from the positive nuclear charge
Question 78. The Group-II elements are metals which form
  1.    ionic compounds
  2.    covalent compounds
  3.    metallic compounds
  4.    dative compounds
 Discuss Question
Answer: Option A. -> ionic compounds
Answer: (a).ionic compounds
Question 79. Halogen that has the lowest electronegativity is
  1.    Bromine (Br₂)
  2.    Chlorine (Cl₂)
  3.    Iodine (I₂)
  4.    Fluorine (F₂)
 Discuss Question
Answer: Option C. -> Iodine (I₂)
Answer: (c).Iodine (I₂)
Question 80. Which statement is correct about Group-II metals who have attraction of high nuclear charge?
  1.    it is because of the greater shielding effect
  2.    it makes the loss of electrons impossible
  3.    it is because of the distance from the nucleus
  4.    it outweighs the attraction of higher nuclear charge
 Discuss Question
Answer: Option D. -> it outweighs the attraction of higher nuclear charge
Answer: (d).it outweighs the attraction of higher nuclear charge

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