Past Questions And Answers
From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences.
The couple _______ their first child when I entered college.
- A. hasn't had
- B. haven't had
- C. were not having
- D. hadn't had
Which of the following elements would displace copper from a solution of copper ions?
- A. silver
- B. gold
- C. lead
- D. mercury
Two plants with red flowers were back crossed, which of the following results indicate that the plants are heterozygous red flowers, where red flowers are dominant?
- A. 75% red and 25% white
- B. 50% red and 50% white
- C. 100% white
- D. 100% red
Which of the following is not a form of stigmatization
- A. refusal to interact with family of an HIV patient
- B. physical and verbal abuse of an HIV patient
- C. ostracizing HIV patients
- D. enlightening people living with HIV/AIDS
A price quotation that covers the cost of goods and all other expenses incurred in delivering the goods to the buyer is called?
- A. CIF
- B. FAS
- C. Franco
- D. Loco
In sales ledger control account, returns inwards is usually
- A. debited and debtors credited
- B. credited and sales returns debited
- C. debited and cash credited
- D. credited and bank credited
After the sentence below, a list of possible interpretations is given. Choose the interpretation that you consider most appropriate for the sentence.
Ojo's learning has gone to his head. This means that Ojo
- A. has become proud because of his learning
- B. has learnt too much
- C. has been made mad by his learning
- D. feels that only learning is important
The type of activity which turns processed raw materials into consumer and industrial goods is described as
- A) extractive
- B) manufacturing
- C) constructive
- D) processing
a. A compound contains 52.2% C, 13.1 % H and Oxygen only. The vapour density of the compound is 23.
Determine i. its empirical formula; ii. its molecular formula, [H=1.0, C=12.0, O= 16.0]
iii1). The compound reacts with sodium metal to produce hydrogen gas and when warmed with acidified \(KMnO_{4(aq)}\) gives a solution that turns from purple to colorless. It also forms a sweet-smelling liquid when heated with ethanoic acid in the presence of concentrated \(H_2SO_4\)
name the functional group present in the compound; iii2). draw the structural formula of the compound.
b. Outline the chemical equations for the production of ethanol from cooked cassava.
ci. Explain briefly why a piece of aluminum does not react with water.
ii. How can a pure sample of aluminum chloride crystals be prepared from aluminium
d. Describe how water can be separated from aqueous \(CuSO_4\)
View Discussion (0)WAEC 2023 THEORY
(a)(1) Define each of the following terms: I. deliquescence; II. efflorescence.
(ii) Give one example I substance that undergoes each of the processes in (a)(i).
(b) Outline how three colourless gases suspected to be ethane, ethene and ethyne could be distinguished in the laboratory.
(c)(i) What is water crystallization?
(ii) Hydrated calcium chloride (CaCl\(_2\) = 111, xH\(_2\)O) contains 49.32% water of cystallization. Calm the value of x. [ (CaCl\(_2\) = 111, H\(_2\)O = 18 ]
(d) Name one calcium compound used (i) in the manufactur cement; (ii) as a dessicant; (iii) in the production of plaster of Paris (POP);
(iv) to neutralise acidic soils
(e) A concentrated solution of sodium chloride was electrolysed using graphite electrodes.
(i) State the ions present in the solution
(ii) Name the products at the I. anode, II. cathode.
(iii) Give the by-product of the electrolysis.
View Discussion (0)WAEC 2009 THEORY