The relative atomic mass of chlorine is not a whole number because
- A. it is the weighted average mass of all its various isotopes
- B. it is the average mass of all the isotopes of the element
- C. the element has strong oxidizing ability
- D. the atom contains a higher number of neutrons than protons
An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?
- A. 1718W
- B. 1817W
- C. 3517W
- D. 3518W
Which of the following transition metals is not attracted to external magnetic field?
- A. Cu
- B. Fe
- C. Ti
- D. Zn
The electron configuration of \(_{26}Fe^{3+}\) is?
- A. [Ar]4s23d6
- B. [AR]4s23d3
- C. [AR]4s13d4
- D. [AR]4s03d5
Which of the following processes is used in food preservation in an industry?
- A. Carbon dating
- B. Ieeadiation of gamma rays
- C. Nuclear fission
- D. Nuclear fusion
Which of the following arrangements is in decreasing order of atomic radius?
- A. Li>Be>C>
- B. Li>B>Be>C
- C. Li>Be>B>C
- D. C>B>Be>Li
The two elements 11X and 19Y are in the same group because they have the same
- A. valence electrons
- B. ionization energy
- C. number of shell
- D. atomic size
Hydrogen bonds are formed between molecules containing a hydrogen atom bonded to a
- A. strongly electronegative atom
- B. non-polar species
- C. diatomic element
- D. complex ion
The crystal layers in graphite are held together by
- A. covalent bond
- B. electrostatic forces
- C. ionic bond
- D. van der Waal's forces
Which of the following substances is mainly responsible for the depletion of the ozone layer?
- A. Oxgyen
- B. Chlorofluorocarbon
- C. Carbon (ll) oxide
- D. Nitrogen (ll) oxide
Brass is a mixture of
- A. Cu and Sn
- B. Cu and Zn
- C. Cu and Mg
- D. Cu and Pb
A metal that is widely used in the manufacture of paints and overhead electric cables is
- A. aluminium
- B. copper
- C. iron
- D. lead
Which of the following pollutants is not usually recycled?
- A. Aluminium cans
- B. Glass bottles
- C. Nuclear wastes
- D. Paper wastes
Which of the following industrial processes depends on the action of enzymes?
- A. Liquefaction of air
- B. Manufacture of soap
- C. Brewing of beer
- D. Catalytic cracking
A tertiary alkanol has a molecular formula C\(_4\)H\(_{10}\)O. What is the structural formula of the compound?
- A. (CH 3)2CHCH2OH
- B. CH3CH2CH(OH)CH3
- C. (CH3)3COH
- D. CH3CH2CH2CH2OH
An alkanol can be prepared by the reaction of an alkene with
- A. concentrated tetraoxosulphate (VI) acid
- B. bromine tetrachloroethane
- C. aqueous potassium tetraoxomanganate (VII)
- D. sodium hydroxide solution
Which of the following substances would not produce ethanol when fermented?
- A. Cane sugar
- B. Glucose
- C. Starch
- D. Vinegar
Consider the following reaction equation: C\(_{16}\)H\(_{34}\) → C\(_5\)H\(_{12}\) + C\(_{11}\)H\(_{22}\). The process represented by the equation is
- A. cracking
- B. fermentation
- C. polymerization
- D. reforming
The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is
- A. +3
- B. +2
- C. -2
- D. -3
Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator
- A. l and lll only
- B. ll and lll only
- C. l and ll only
- D. l, ll and lll