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MCQs

Total Questions : 212 | Page 7 of 22 pages
Question 61. Phenolphthalein changes color in
  1.    acids
  2.    alkalis
  3.    water
  4.    salt solutions
 Discuss Question
Answer: Option B. -> alkalis
Answer: (b).alkalis
Question 62. The insect which feeds on cactus has a scarlet pigment known as
  1.    cochineal only
  2.    Carminic acid only
  3.    chloroplast
  4.    cochineal and Carminic acid
 Discuss Question
Answer: Option D. -> cochineal and Carminic acid
Answer: (d).cochineal and Carminic acid
Question 63. Many of pigments found in living things can be used as
  1.    indicators
  2.    reactants
  3.    catalyst
  4.    enzymes
 Discuss Question
Answer: Option A. -> indicators
Answer: (a).indicators
Question 64. Dye which changes color over a specific pH range is
  1.    acid-base indicator
  2.    reactant
  3.    catalyst
  4.    product
 Discuss Question
Answer: Option A. -> acid-base indicator
Answer: (a).acid-base indicator
Question 65. The color of the indicator is solely dependent upon concentration of
  1.    H⁺ ion
  2.    OH⁻ ion
  3.    concentration of solute in the solution
  4.    concentration of solvent in the solution
 Discuss Question
Answer: Option A. -> H⁺ ion
Answer: (a).H⁺ ion
Question 66. In the first stage in Contact process, sulfur (S₈) is burned to form
  1.    sulfur dioxide gas
  2.    sulfur trioxide
  3.    sulfur tetraoxide
  4.    sulfuric acid (H₂SO₄)
 Discuss Question
Answer: Option A. -> sulfur dioxide gas
Answer: (a).sulfur dioxide gas
Question 67. The basic formula for monobasic acid is
  1.    AH
  2.    HA
  3.    Ha
  4.    aH
 Discuss Question
Answer: Option B. -> HA
Answer: (b).HA
Question 68. Sulfuric acid is not used in
  1.    making fertilizers
  2.    detergents
  3.    toothpaste
  4.    none of above
 Discuss Question
Answer: Option D. -> none of above
Answer: (d).none of above
Question 69. Sulfuric acid (H₂SO₄) is used in
  1.    tanning leather
  2.    pickling
  3.    car batteries
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 70. The conversion of sulfur dioxide (SO₂) to sulfur trioxide (SO₃) is basically
  1.    reversible reaction
  2.    irreversible reaction
  3.    dynamic reaction
  4.    static reaction
 Discuss Question
Answer: Option A. -> reversible reaction
Answer: (a).reversible reaction

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