Chemistry Past Questions And Answers
\(^{226}_{88}Ra \rightarrow ^x_{86}Rn + \alpha - particle\). What is the value of x in the nuclear reaction?
- A) 226
- B) 220
- C) 222
- D) 174
The following oxides react with both acids and bases to form salts except
- A. zinc oxide
- B. lead (ll) oxide
- C. aluminium oxide
- D. carbon (Iv) oxide
a. In an experiment, 20.0 \(cm^3\) of a solution containing 4g/\(dm^3\) of sodium hydroxide was neutralized by 8.0 \(cm^3\) of dilute tetraoxosulphate (VI) acid: i. Write a balanced equation for the reaction; ii. calculate the concentration of the acid in mol/ \(dm^3\)
bi. State two postulates of the Kinetic theory of gases which real gases do not obey
ii. Explain briefly why real gases do not obey the postulates stated in 2(b)(i).
c. Consider the following compound:
Name the compound
ii. name the two structural isomers of the compound;
iii. state the chemical process involved in the preparation of the compound from starch,
iv. write the chemical equation for the steps involved in the process in 2(c)(ii).
v. name two enzymes involved in the process in 2(c)(iii)
d. Explain briefly the term structural isomerism.
View Discussion (0)WAEC 2023 THEORY(a) List two industrial uses of concentrated tetraoxosulphate (VI) acid
(b) The diagram below represents the set-up for the electrolysis of dilute tetraoxosulphate (VI) acid. Use it to answer Questions (i) to (iii).
(i) Which letter on the diagram represents the battery?
(ii) Write an equation for the reaction occurring at the cathode
(iii) What product does V represent?
Hydrogenation of butene yields
- A. butyne
- B. butane
- C. pentence
- D. butanol
P1V1 = P2V2 supports ?
- A) Charles’s law
- B) Boyles’s law
- C) Graham’s law
- D) Avogadro’s law
In the Periodic Table, the elements that loss electrons most readily belong to
- A. Group 1 A
- B. Group 11 A
- C. Group 111 A
- D. Group V11 A
The number of neutrons in the deuterium atom is/are
- A) 0
- B) 1
- C) 2
- D) 3
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
- A. ethane
- B. chlorine
- C. hydrogen chloride
- D. ethene
The colour of phenolphthalein indicator in dilute HNO is
- A. colourless
- B. orange
- C. pink
- D. purple