MCAT Practice Test - Page 4
Q. 67. Silicon, a common element, is found in rocks. Which of the following is mostly combined with silicon?
- A. Chlorine
- B. Oxygen
- C. Carbon
- D. Sulfur
Q. 68. The bonding that explains the variation of the boiling point of water from the boiling point of similarly structured molecules is:
- A. Van der Waals forces
- B. Covalent bonding
- C. Hydrogen bonding
- D. Ionic bonding
Q. 69. Which of the following is called a DIOL?
- A. Glycerol
- B. Glycol
- C. Methanol
- D. Ethanol
Q. 70. NaHCO₃ decomposes on heating. In an experiment, a 5 mol sample of NaHCO₃ was heated. What volume of CO₂ will be yielded in the result of this experiment? Reaction is given as follows:
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
- A. 24 dm³
- B. 60 dm³
- C. 35 dm³
- D. 48 dm³
Q. 71. Rancidity involves:
- A. Oxidation and reduction
- B. Oxidation and hydrolysis
- C. Hydrolysis and reduction
- D. Reduction only
Q. 72. When glucose is heated with Fehling’s solution, the color of the precipitate obtained is:
- A. Black
- B. Yellow
- C. Red
- D. White
Q. 73. A compound contains 75% carbon and 25% hydrogen by mass. What is the molecular formula of the compound?
- A. CH₄
- B. CH₃
- C. C₂H₄
- D. C₂H₆
Q. 74. Which one of the following is electron deficient?
- A. NH₃
- B. PH₃
- C. BCl₃
- D. PCl₃
Q. 75. In an acetyl molecule, two atoms of carbon are bonded by:
- A. Two sigma bonds and two pi (π) bonds
- B. One sigma bond and one pi (π) bond
- C. Two sigma bonds and one pi (π) bond
- D. One sigma bond and two pi (π) bonds
Q. 76. Aqua regia is a mixture of HNO₃ and HCl mixed in the ratio of:
- A. 3 : 1
- B. 1 : 3
- C. 2 : 3
- D. 3 : 4
Q. 77. The chemical reaction "CaCO₃ (s) → CaO (s) + CO₂ (g)" shows:
- A. Reduction
- B. Oxidation
- C. No change in oxidation state
- D. Both oxidation and reduction
Q. 78. When electric current passes through an aqueous solution, which one of the following ionic migrations is correct?
- A. H⁺ ions move towards anode
- B. Cl⁻ ions move towards anode
- C. Cl⁻ ions move towards cathode
- D. Both move towards cathode
Q. 79. What is the structure associated with BF₃ molecule?
- A. Linear
- B. Triangle
- C. Trigonal pyramidal
- D. Tetrahedron
Q. 80. Metals lose electrons more easily than non-metals because of:
- A. High ionization potential
- B. High electron affinity
- C. Low ionization potential
- D. Low electronegativity
Q. 81. The correct formula of ‘Plaster of Paris’ is:
- A. CaSO₄·H₂O
- B. CaSO₄·2H₂O
- C. CaSO₄·3H₂O
- D. CaSO₄·½ H₂O
Q. 82. Yeast can be used to convert simple sugars into:
- A. Ethanoic acid and oxygen
- B. Ethanol and oxygen
- C. Ethanol and carbon dioxide
- D. Starch and carbon dioxide
Q. 83. Down’s cell is used for manufacturing sodium because:
- A. Anode does not react with chlorine
- B. Sodium floats on the fused sodium chloride
- C. Graphite does not react with sodium
- D. It is easy to fix graphite in circular form
Q. 84. Which type of isomerism is shown by the following compounds?
• CH₃-CH₂-O-CH₂-CH₃
• CH₃-CH₂-CH₂-O-CH₃
- A. Position isomerism
- B. Chain isomerism
- C. Metamerism
- D. Functional isomerism
Q. 85. Red lead, commonly known as ‘Sandur’, is represented by the formula:
- A. PbO
- B. Pb₃O₄
- C. PbCrO₄
- D. PbCO₃
Q. 86. What happens if a reaction is at equilibrium state and some more reactants are added in the container?
- A. The equilibrium will not be affected
- B. The reverse reaction rate will increase
- C. The forward reaction rate will increase
- D. The forward reaction rate will decrease
Q. 87. How much heat energy is required when 8 grams of hydrogen are burnt? The thermal reaction is: 2H₂ + O₂ → 2H₂O + 136.64 kcal
- A. 273.28 kcal
- B. 68.32 kcal
- C. 136.64 kcal
- D. 102.48 kcal
Q. 88. Which of the following is NOT a commonly occurring sulfur compound?
- A. H₂SO₄
- B. H₂S
- C. SO₃
- D. SO₂
Q. 89. The most active non-metal has:
- A. Medium electronegativity
- B. High electronegativity
- C. Low electronegativity
- D. Large atomic radius
Q. 90. A compound, whose molecular mass is 90 grams, contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen. What is the true formula of the compound?
- A. CH₂O₄
- B. C₃H₆O
- C. C₃HO₃
- D. C₂H₂O₄