MCAT Practice Test
Q. 67. Silicon, a common element, is found rocks. Which of the following is mostly combined with the silicon?
- Chorine
- Oxygen
- Carbon
- Sulfur
Q. 68. The bonding that explains the variation of the boiling point of water from the boiling point of similarly structured molecule is:
- Vander waals forces
- Covalent bonding
- Hydrogen bonding
- Ionic bonding
Q. 69. Which of the following is called DIOL?
- Glycerol
- Glycol
- Methanol
- 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
- 24 dm3
- 60 dm3
- 35 dm3
- 48 dm3
Q. 71. Raincidity involves:
- Oxidation and reduction
- Oxidation and hydrolysis
- Hydrolysis and reduction
- Reduction only
Q. 72. When glucose is heated with Fehling’s solution, the colour of the precipitate obtained is:
- Black
- Yellow
- Red
- White
Q. 73. A compound contains 75 % carbon and 25 % hydrogen by mass. What is the molecular formula of the compound?
- CH4
- CH3
- C2H4
- C2H6
Q. 74. Which one of the following is electron deficient?
- NH3
- PH3
- BCl3
- PCl3
Q. 75. In an acetyl molecule, two atoms of carbon are bonded by:
- Two sigma bonds and two pi (π) bond
- One sigma bond and one pi (π) bond
- Two sigma bonds and one pi (π) bond
- One sigma bonds and two pi (π) bond
Q. 76. Aqua -Regia is a mixture of HNO3 and HCl mixed in ratio of:
- 3 : 1
- 1 : 3
- 2 : 3
- 3 : 4
Q. 77. The chemical reaction "CaCO3 (g) → CaO (g) + CO2 (g)" shows:
- Reduction
- Oxidation
- No change in oxidation state
- Both oxidation and reduction
Q. 78. When electric current passes through an aqueous solution, which one of the following ionic migration is correct?
- H+ ions move towards anode
- Cl- ions move towards anode
- Cl- ions move towards cathode
- Both move towards cathode
Q. 79. What is the structure associate with BF3 molecule?
- Linear
- Triangle
- Trigonal Pyramidal
- Tetrahedron
Q. 80. Metals lose electrons more easily than non-metals because of:
- High ionization potential
- High electron affinity
- Low ionization potential
- Low electron negativity
Q. 81. The correct formula of ‘Plaster of Paris’ is:
- CaSO4H2O
- CaSO42H2O
- CaSO43H2O
- CaSO4. ½ H2O
Q. 82. Yeast can be used to covert simple sugars into:
- Ethanoic acid and oxygen
- Ethanol and oxygen
- Ethanol and carbon dioxide
- Starch and carbon dioxide
Q. 83. Down’s cell is used for manufacturing sodium because:
- Anode does not react with chlorine
- Sodium floats on the fused sodium chloride
- Graphite does not react with sodium
- 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
- Position isomerism
- Chain isomerism
- Metamerism
- Functional isomerism
Q. 85. Red lead commonly known as ‘Sandur’ is represented by formula:
- PbO
- Pb3O4
- PbCrO4
- PbCO3
Q. 86. What happens if a reaction is at equilibrium state and some more reactants is added in container?
- The equilibrium will not be affected
- The reverse reaction-rate will increase
- The forward reaction-rate will increase
- 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
- 273.56 kcal
- 68.32 kcal
- 136.64 kcal
- 102.48 kcal
Q. 88. Which of the following is NOT a commonly occurring Sulfur compound?
- H2SO4
- H2S
- SO3
- SO2
Q. 89. The most active non-metal has:
- Medium electro-negativity
- High electro-negativity
- Low electro-negativity
- 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?
- CH2O4
- C3H6O
- C3HO3
- C2H2O4