A thousand ways to pass basic chemistry examination

161.What is the process associated with conversion of vegetable oil to soap?
  • A. Esterification
  • B. Saponification
  • C. hydrolysis
  • D. Acidification
162.When ethanal vapour is passed over manganese (II) ethanoate (manganese acetate) catalyst in the presence of air, the product is:
  • A. ethanoate
  • B. ethanol
  • C. methanol
  • D. ethanoic acid
163.When KOH is used instead of NaOH in the production of soap, it has the following advantages except it gives:
  • A. softer soap
  • B. harder soap
  • C. soap with lower melting point
  • D. more soluble soap
164.When palm wine is left exposed to air for a few days, it goes sour. The bacteria in the air oxidises.________ in palm wine to _________
  • A. ethanol, ethanoic acid
  • B. ethanoic acid, ethanol
  • C. ester, ethanoic acid
  • D. ether, ethanol
165.Which of the following is not true about benzoic acid?
  • A. It is aromatic in nature
  • B. It can be manufactured from methylbenzene
  • C. It has molecular formula C₆H₆COOH
  • D. It sublimes readily
166.Which of the following reactions is correct?
  • A. C₆H₅COOH + CaO → C₆H₅Ca + HCO₃
  • B. C₆H₅COOH + CaO → C₆H₆ + CaCO₃
  • C. C₆H₅COOH + PCl₅ → C₆H₅Cl + H₂PO4
  • D. C₆H₅COOH + C₂H₅OH → C₆H₆ + C₃H₈COOH
167.Which of these is not a property of ethanedioic acid?
  • A. It is a stronger acid than ethanoic acid but weaker than inorganic acids
  • B. It is a reducing agent
  • C. It is an oxidising agent
  • D. It is soluble in cold water
168.Organic Chemistry is the branch of Chemistry that deals with _____ and ____
  • A. Hydrogen & oxygen
  • B. Carbon & Carbon
  • C. Carbon & Sulphur
  • D. Carbon & Hydrogen
169.The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as
  • A. Brownian motion
  • B. ZigZag Motion
  • C. Evaporation
  • D. Liquefaction
170.Which of the following is an acidic salt?
  • A. NaHSO₄
  • B. Na₂SO₄
  • C. CH₃CO₁Na
  • D. Na₂S
171.Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron(III)oxide will be contained in 1kg of the compound?
  • A. 12.5moles
  • B. 0.625moles
  • C. 25moles
  • D. 6.25moles
172.3.0g of a mixture of potassium carbonate and potassium chloride were dissolved in a 250cm³ standard flask. 25cm³ of this solution require 40.00cm³ of 0.01m HCl for neutralization. What is the percentage by weight of K₂CO₃ in the mixture? (K=39,O=16,C=12)
  • A. 9.2%
  • B. 8.9%
  • C. 7.2%
  • D. 82%
173.0.499 of CuSO₄.XH₂O when heated to constant weight gave a residue of 0.346g. What is the value of X?
  • A. 2.0
  • B. 3.0
  • C. 5.0
  • D. 4.0
174.The principal constituent of natural gas is
  • A. Methane
  • B. Ethane
  • C. Propane
  • D. Butane
175.Which of the following gases can be collected by the method of downward delivery?
  • A. Chlorine
  • B. Oxygen
  • C. Ammonia
  • D. Hydrogen
176.A mixture of sugar and sulphur can be separated by
  • A. Dissolution in water, evaporation and filtration
  • B. Filtration, evaporation and dissolution in water
  • C. Dissolution in water, filtration and evaporation
  • D. Evaporation, dissolution in water and filtration
177.The percentage of water of crystallization in ZnSO₄ 7H₂O is
  • A. 33%
  • B. 44%
  • C. 55%
  • D. 87%
178.When a solution of silver(I) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is
  • A. H₂S
  • B. Ag₂S
  • C. PbS
  • D. HNO₃
179.In which of the following reactions does reduction takes place
  • A. Fe²⁺-e⁻ ---- Fe³⁺
  • B. 2O²⁻ ----O₂ +4e⁻
  • C. Cr---2e⁻ + Cr²⁺
  • D. 2H⁺ +2e⁻ --- H2
180.The weakest attractive force that can be observed between two molecules is
  • A. Ionic
  • B. Covalent
  • C. Coordinates
  • D. Van der waals forces