An element Y has the electronic configuration 1s22s22p6623p4. To what period does it belong in the periodic table?
- A. 3
- B. 4
- C. 5
- D. 6
The conclusion from Rutherford’s alpha-scattering experiment is that
- A. atoms are mostly empty space with a small nucleus
- B. emissions from radioactive substances consist of three main components
- C. there is nuclear pull on orbital electrons
- D. electrons are deflected by both magnetic and electric fields
Which of the following elements has a ground state electronic configuration with an incomplete penultimate shell?
- A. Iron
- B. Sodium
- C. Aluminium
- D. Calcium
A hydrogen atom which has lost an electron contains
- A. one proton only
- B. one neutron only
- C. one proton and one neutron
- D. one proton, one electronic and one neutron
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
- A. 16
- B. 17
- C. 18
- D. 19
The atom of an element X is represented as \(^y_z X\). The basic chemical properties of X depend on the value of
- A. Y
- B. Z
- C. Y - Z
- D. Z - Y
If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
- A. naturally radioactive
- B. abundant in nature
- C. a transition metal
- D. an isotopic mixture
The oxide from electric power station is
- A. carbon (IV) oxide
- B. copper (ll) oxide
- C. nitrogen (IV) oxide
- D. sulphur (IV) oxide
The most common process in the extraction of metals from their ore is
- A. catalysis
- B. electrolysis
- C. oxidation
- D. reduction
Which of the following gases is used to retard the vaporization of the filament in a light bulb?
- A. Argon
- B. Helium
- C. Hydrogen
- D. Oxygen
The purity of a solid sample can best be determined by its?
- A. boiling point
- B. melting point
- C. conductivity
- D. solubility
The production of biogas from the fermentation of waste materials is an example of
- A. combustion
- B. incineration
- C. refining
- D. recycling
Which of the following organic compounds could be represented by the empirical formula CH2O?
- A. Ethanal
- B. Ethane
- C. Ethanol
- D. Ethanoic acid
Consider the reaction represented by the following equation: C2H4(g)
+ 302(g) → 2CO2(g) + 2H2O(g)How many moles of ethene would be burnt to produce 0.1 mole of water?
- A. 0.05 mole
- B. 0.10 mole
- C. 0.20 mole
- D. 2.00 moles
The liquid hydrocarbon likely to be found in the fraction of crude oil used for domestic cooking is?
- A. C3H8
- B. C 5H 12
- C. C13H28
- D. C20H42
A colourless hydrocarbon with a sweet smell undergoes substitution reaction. The hydrocarbon is likely to be
- A. alkanol
- B. benzene
- C. ester
- D. methane
The enzyme that catalyses the conversion of glucose te ethanol and carbon (IV) oxide is
- A. diastase
- B. maltase
- C. ptyalin
- D. zymase
The IUPAC name of the following organic compound is HOOC – COOH
- A. ethan - 1, 2 -dioc acid
- B. ethanoic acid
- C. oxalic acid
- D. propan - 1,2-dioic acid
Which type of reaction is illustrated by the following equation? C12H26 → 5C 2H4 + C 2H6
- A. Addition
- B. Cracking
- C. Hydrogenation
- D. Polymerization
Which of the following compounds determines the octane rating of petrol?
- A. 1,2,3 - trimethyl pentane
- B. 2,3,5 - trimethyl octane
- C. 2,3,5 - trimethyl pentane
- D. 2,2,4 - trimethyl pentane
Ethene molecules can be added to one another to form a long chain compound called a
- A. dimer
- B. monomer
- C. polymer
- D. trimer