Chemistry Past Questions And Answers
Which of the following compounds can exist as geometric isomers?
- A. 2-methylbut-2ene
- B. But-2-ene
- C. But-1-ene
- D. CI-C-Br
(a)i. State two characteristics of a homologous series.
(ii) Explain briefly why there are differences in the reaction of ethane and ethene.
(b) When crystals of sodium chloride were warmed with concentrated tetraoxosulphate( VI) acid, a gas was evolved.
(i) Name the gas.
(ii) State two physical properties of the gas.
(iii) Write a balanced chemical equation for the reaction.
(c)i. What are hydrocarbons?
(ii) State two natural sources of hydrocarbons.
(iii) A hydrocarbon contains 83% of carbon by mass. Calculate its empirical formula. [H=1.0, C=12.0]
(d) Draw and label a diagram of a set-up that could be used to electroplate a copper ornament with silver
View Discussion (0)WAEC 2021 THEORYA catalyst increase the rate of a chemical reaction by providing a path that
- A) raise the activiation energy
- B) increase the temperature
- C) lowers the activation energy
- D) increase the concentration
Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?
- A. nitrate
- B. carbonate
- C. chloride
- D. sulphide
A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be
- A) sulphur (VI) oxide
- B) hydrogen chloride
- C) sulphur (VI) oxide
- D) hydrogen sulphide
Which of the following reactions will be affected by change in pressure at equilibrium?
- A. X(g) + Y(g) ⇌ W(g) + Z(g)
- B. X(g) + 2Y(g) ⇌W(g) + Z(g)
- C. 2X(g) ⇌ W(g) + Z(g)
- D. 2Y(g) ⇌ W(g) + Z(g)
Chlorine consisting of two isotopes of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotopes of mass number 37
- A. 20
- B. 25
- C. 60
- D. 75
Noble gas molecules are held together by
- A. van der Waals forces
- B. hydrogen bonds
- C. dative bonds
- D. covalent bonds
Cast iron is used in making
- A) Chains and agricultural implements
- B) Iron sheets and retort stand
- C) Nails and iron rods
- D) Stoves and cookers
The density of a certain gas is 1.98gdm_3 at stp. What is the molecular mass of the gas? (molar volume of gas at stp = 22.4dm3)
- A) 44g
- B) 54g
- C) 26g
- D) 31g