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MCAT Practice Test

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Q. 67. Silicon, a common element, is found rocks. Which of the following is mostly combined with the silicon?

  1. Chorine
  2. Oxygen
  3. Carbon
  4. Sulfur

Q. 68. The bonding that explains the variation of the boiling point of water from the boiling point of similarly structured molecule is:

  1. Vander waals forces
  2. Covalent bonding
  3. Hydrogen bonding
  4. Ionic bonding

Q. 69. Which of the following is called DIOL?

  1. Glycerol
  2. Glycol
  3. Methanol
  4. 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 → H2O + CO2

  1. 24 dm3
  2. 60 dm3
  3. 35 dm3
  4. 48 dm3

Q. 71. Raincidity involves:

  1. Oxidation and reduction
  2. Oxidation and hydrolysis
  3. Hydrolysis and reduction
  4. Reduction only

Q. 72. When glucose is heated with Fehling’s solution, the colour of the precipitate obtained is:

  1. Black
  2. Yellow
  3. Red
  4. White

Q. 73. A compound contains 75 % carbon and 25 % hydrogen by mass. What is the molecular formula of the compound?

  1. CH4
  2. CH3
  3. C2H4
  4. C2H6

Q. 74. Which one of the following is electron deficient?

  1. NH3
  2. PH3
  3. BCl3
  4. PCl3

Q. 75. In an acetyl molecule, two atoms of carbon are bonded by:

  1. Two sigma bonds and two pi (π) bond
  2. One sigma bond and one pi (π) bond
  3. Two sigma bonds and one pi (π) bond
  4. One sigma bonds and two pi (π) bond

Q. 76. Aqua -Regia is a mixture of HNO3 and HCl mixed in ratio of:

  1. 3 : 1
  2. 1 : 3
  3. 2 : 3
  4. 3 : 4

Q. 77. The chemical reaction "CaCO3 (g) → CaO (g) + CO2 (g)"   shows:

  1. Reduction
  2. Oxidation
  3. No change in oxidation state
  4. Both oxidation and reduction

Q. 78. When electric current passes through an aqueous solution, which one of the following ionic migration is correct?

  1. H+ ions move towards anode
  2. Cl- ions move towards anode
  3. Cl- ions move towards cathode
  4. Both move towards cathode

Q. 79. What is the structure associate with BF3 molecule?

  1. Linear
  2. Triangle
  3. Trigonal Pyramidal
  4. Tetrahedron

Q. 80. Metals lose electrons more easily than non-metals because of:

  1. High ionization potential
  2. High electron affinity
  3. Low ionization potential
  4. Low electron negativity

Q. 81. The correct formula of ‘Plaster of Paris’ is:

  1. CaSO4H2O
  2. CaSO42H2O
  3. CaSO43H2O
  4. CaSO4. ½ H2O

Q. 82. Yeast can be used to covert simple sugars into:

  1. Ethanoic acid and oxygen
  2. Ethanol and oxygen
  3. Ethanol and carbon dioxide
  4. Starch and carbon dioxide

Q. 83. Down’s cell is used for manufacturing sodium because:

  1. Anode does not react with chlorine
  2. Sodium floats on the fused sodium chloride
  3. Graphite does not react with sodium
  4. 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
  1. Position isomerism
  2. Chain isomerism
  3. Metamerism
  4. Functional isomerism

Q. 85. Red lead commonly known as ‘Sandur’ is represented by formula:

  1. PbO
  2. Pb3O4
  3. PbCrO4
  4. PbCO3

Q. 86. What happens if a reaction is at equilibrium state and some more reactants is added in container?

  1. The equilibrium will not be affected
  2. The reverse reaction-rate will increase
  3. The forward reaction-rate will increase
  4. 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

  1. 273.56 kcal
  2. 68.32 kcal
  3. 136.64 kcal
  4. 102.48 kcal

Q. 88. Which of the following is NOT a commonly occurring Sulfur compound?

  1. H2SO4
  2. H2S
  3. SO3
  4. SO2

Q. 89. The most active non-metal has:

  1. Medium electro-negativity
  2. High electro-negativity
  3. Low electro-negativity
  4. Large atom radii

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?

  1. CH2O4
  2. C3H6O
  3. C3HO3
  4. C2H2O4