Chemistry Past Questions And Answers
Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of Sand, water and methanoic acid?
- A) Fractional distillation
- B) Filtration followed by distillation
- C) Neutralization with sodium hydroxide followed by distillation
- D) Neutralization with sodium hydroxide followed by filtration
Which of the following is suitable for determining different isotopes present in an element which exhibits isotopy?
- A. Sensitive weighing balance
- B. Cathoda ray tube
- C. Mass spectrometer
- D. Geiger muller counter
How is the equilibrium constant for the forward reaction of an equilibrium (Kf) related to that of the reverse reaction (Kr)?
- A) (Kr) is the additive inverse of (Kf)
- B) (Kr) is the multiplicative inverse of (Kf)
- C) (Kr) is the same as (Kf)
- D) the product of (Kr) and (Kf) is zero
Which of the following substances when boiled with aqueous solution of sodium hydroxide would be hydrolyzed? i. Protein ii. Fat iii. Polythene
- A. i
- B. ii
- C. i and ii
- D. ii and iii
A mixture of iron and sulphur can be separated by dissolving the mixture in?
- A. steam
- B. dilute hydrochloric acid
- C. dilute sodium hydroxide
- D. benzene
Carbohydrates are large molecules with the molecular formula C x (H2O)y. In which of the following pairs is x not equal to y?
- A) glucose and starch
- B) maltose and starch
- C) sucrose and fructose
- D) maltose and starch
Which of the following metals can be used as sacrificial cathode for preventing corrosion of a length of iron pipe?
- A) Ag
- B) Cu
- C) Mg
- D) Mn
What is the volume occupied by 2 moles of ammonia at s.t.p?
- A. 44.8 dm-3
- B. 22.4 dm-3
- C. 11.2 dm-3
- D. 5.6 dm-3
In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?
- A) Equilibrium constant is very large
- B) âH - TâS = O
- C) â H > T â S
- D) Equilibrium constant is less than zero
(a) State two postulates of the kinetic theory of gases.
(b) Write two chemical properties that are common to both carbon (IV) oxide and sulphur (IV) oxide.
View Discussion (0)WAEC 1998 THEORY