Chemistry Past Questions And Answers
Pauli Exclusion Principle is related to
- A. quantum numbers of electrons
- B. reversiblility of equlibrium reactions
- C. electronegativity values of elements
- D. collision theory of reaction rates
Sieving is a technique used to separate mixtures containing solid particles
- A) small sizes
- B) large sizes
- C) different size
- D) the same size
In which of the following atoms is the ionic radius larger than the atomic radius? [11Na,12Mg,13AI,17CI]
- A. Aluminium
- B. Chlorine
- C. Magnesium
- D. Sodium
Which of the following is hydrocarbons is unsaturated?
- A. Ethane
- B. Benzene
- C. Propane
- D. 2 - methylbutane
(a) Give one reason why a collision between reactants may not produce new species.
(b) Explain, illustrating with appropriate equation(s), why an aqueous solution of aluminium chloride is acidic.
View Discussion (0)WAEC 1990 THEORYA metal that forms soluble trioxosulphate (IV) ion is
- A) barium
- B) potassium
- C) manganese
- D) aluminium
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
Which of the following is a redox reaction?
- A)2HNO\(_2\) + 2HI \(\rightarrow\) 2H\(_2\)O + 2NO + I\(_2\)
- B)Zn + H\(_2\)SO\(_4\) \(\rightarrow\) ZnSO\(_4\) + H\(_2\)
- C)BaCl\(_2\) + 2AgNO\(_3\) \(\rightarrow\) AgCl\(_2\) + Ba(NO\(_3\))\(_2\)
- D)4FeO + O\(_2\) \(\rightarrow\) 2Fe\(_2\)O\(_3\)
Which of the following molecules has a linear structure?
- A. NH4
- B. H2O
- C. CO2
- D. CH4
2H\(_2\) + O\(_2\) → 2H\(_2\)O
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm\(^3\) of hydroden and 75cm\(^3\) of oxygen are involved
- A. 85cm\(^3\)
- B. 50cm\(^3\)
- C. 125cm\(^3\)
- D. 55cm\(^3\)