Chemistry Past Questions And Answers
The oxidation state of chlorine in HClO4 is
- A. -5
- B. -1
- C. +1
- D. +7
What volume of 0.50M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH solution?
- A) 2.0cm3
- B) 5.0cm3
- C) 6.8cm3
- D) 8.3cm3
A metal X forms two bromides with the formulae XBr2 and XBr3. What type of bonding exists between X and bromine in the bromide?
- A. Ionic bonding
- B. Metallic bonding
- C. Dative bonding
- D. Covalent bonding
Leads is used for making bullets and lead shots because of its
- A. resistance to corrosion
- B. low melting point
- C. high density
- D. flexibility
A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3= 106.0]
- A. 0.4 mol dm-3
- B. 1.0 mol dm-3
- C. 10.6 mol dm-3
- D. 25.0 mol dm-3
The solubility of Na3AsO4 (H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the ethanol? (As = 75, Na = 23, O = 16, H = 1)
- A) 87.2%
- B) 38.9%
- C) 19.1%
- D) 13.7%
The following compounds are condensation polymers except
- A. nylon
- B. protein
- C. starch
- D. polyethene
Vulcanization of rubber
- A. stops the growth of fungus on the rubber
- B. increases the solubility of the rubber
- C. decreases the elasticity of the rubber
- D. hardnes the rubber through cross-linkage
How many isomer can be obtained from C4H10
- A. 0
- B. 1
- C. 2
- D. 3
(a)(i) Distinguish between a strong acid and a concentrated acid.
(ii) What is meant by amphoteric oxide? Give one example.
(b)(i) Describe the manufacture of tetraoxosulphate (VI) acid by contact process.
(ii) Write one equation each to show the action of tetraoxosulphate (VI) acid respectively as a dehydrating agent and as an oxidizing agent.
(iii) Give the reason why tetraoxosulphate classified as a heavy chemical.
View Discussion (0)WAEC 1993 THEORY