A thousand ways to pass basic chemistry examination

141.What is the role of iron and Aluminium oxide in ammonia production?
  • A. dehydrating agent
  • B. catalytic agent
  • C. oxidizing agent
  • D. bonding agent
142.When carbon IV oxide is bubbled through lime water, the solution becomes milky due formation of
  • A. Ca(HCO₃)₂
  • B. CaCO₃
  • C. Ca(N0₃)₂
  • D. CaCl₂
143.Which of the following gases dissolves in water vapour to produce acid rain during rainfall?
  • A. Oxygen
  • B. Carbon (II) oxide
  • C. Nitrogen
  • D. Sulphur (IV) oxide
144.Which of the following is not allotrope of carbon?
  • A. diamond
  • B. graphite
  • C. buck minsterfullerene
  • D. none of the above
145.Which oxide is amphiprotic (amphoteric)?
  • A. MgO
  • B. NaO
  • C. CaO
  • D. ZnO
146.Why will it always be more difficult to extract potassium ions from sea water than to extract magnesium ions? This is because
  • A. most potassium compounds are less soluble in water
  • B. most potassium compounds are quite soluble in water
  • C. presence of other alkali metal ions has great influence on it
  • D. magnesium ion is an alkaline earth metal ion
147.___________ can be used to test for reducing sugars:
  • A. Iodine solution
  • B. bromine water
  • C. Fehling’s solution
  • D. de-ionized water
148.2CH₃COOH + Zn → ? The product of this reaction is:
  • A. (CH₃COO)₂Zn + Zn
  • B. CH₃COO CH₃ + Zn
  • C. (CH₃COO)₂Zn + H₂
  • D. CH₃COOH + CH₄
149.A ketone reacts with hydroxylamine to give
  • A. a hydrazone
  • B. an alkanonitrile
  • C. a nitroso compound
  • D. an oxime
150.Alkanoic acids are weak acids and ionises in solution to give:
  • A. R⁺ + COOH
  • B. RCOO⁻ + H⁺
  • C. RCOO⁺ + H⁻
  • D. RCO⁺ + OH
151.An excess of ethanol heated with concentrated H2SO4 at a temperature of 180o C is dehydrated to give mostly:
  • A. ethane
  • B. ethene
  • C. ethanol
  • D. ethoxyethane
152.Butene can be distinguished from benzene by reaction with:
  • A. Hydrochloric acid
  • B. Bromine water
  • C. Potassium sulphate
  • D. Sodium hydroxide
153.Detergent is more efficient than soap in cleansing clothes and dishes because of the following
  • A. the corresponding Ca and Mg compound formed is soluble in H2O
  • B. detergents are not affected by hardness of water
  • C. it cleans better than soap
  • D. it is less expensive
154.In the manufacture of soap industrially, brine is used to.__________.the acid salt.
  • A. oxidise
  • B. reduce
  • C. bleach
  • D. precipitate
155.Methane gas can be made from carbon (II) oxide gas according to the equation 2CO(g) + 2H₂(g) → CH₄(g) + CO₂(g). Calculate the mass of CO required to produce 8.75 x 10²⁵ molecules of CH₄? array(At masses: C=12.011, H= 1.008, O = 15.999, Avogadro’s no: 6.022 x 10²³molecules /mole.)
  • A. 8140g
  • B. 4070g
  • C. 1600g
  • D. 32.00g
156.Potassium ethanoate is formed when:
  • A. Methanoic acid reacts with KOH
  • B. Ethanoic acid reacts with KOH
  • C. Methanol reacts with KCO₃
  • D. Ethanol reacts with CH₃COOH
157.Saponification is defined as:
  • A. Acidic hydrolysis of fat or oil
  • B. Alkali hydrolysis of fat or oil
  • C. Condensation of two monomer units
  • D. Mixture of glacial ethanoic acid and excess of simple alkanol
158.Soaps and detergents have the same basic characteristics except that the carboxyl group of the fatty acid in detergent is replaced by:
  • A. alcohol
  • B. sulphate or a sulphonate group
  • C. ester
  • D. acids
159.The relatively high boiling point of alkanols is due to:
  • A. aliphatic character
  • B. ionic bonding
  • C. hydrogen bonding
  • D. covalent bonding
160.Two important sources of detergent are :
  • A. fat/oils and hydrocarbons
  • B. coal and cement
  • C. pulp and wood
  • D. water and gas