50 MCQ Questions

Choose a metal commonly used as overhead electric cables.
A: Zinc
B: Aluminium
C: Iron
D: Copper
Select a method that can be used to separate a mixture of water and petrol.
A: Evaporation to dryness
B: Separating funnel
C: Sublimation
D: Simple distillation
Determine the atomic number of an atom with electronic configuration 2,8,8,2.
A: 10
B: 4
C: 2
D: 20
The thermal decomposition of calcium nitrate will produce;
A: Ca(N0₂)₂ and O₂
B: C₅H₁₀
C: C₅H₁₁
D: C₅H₈
The transition metal used as a catalyst in the manufacture of ammonia is
A: Vanadium
B: Copper
C: Iron
D: Platinum
The element X exists naturally as two isotopes, ⁸⁰X and ⁸²X in the ratio 1 :1 . The relative atomic mass of X will be
A: 81
B: 80.5
C: 82
D: 80 Questions 7-9 concern the following table. M, N, O, P and Q are not the usual symbols of the elements. Each element can be selected once, more than once or Not at all.
Select from the table:

Element M N O P Q

Proton 12 16 17 18 20

Electron 12 17 17 18 20
An element that will not react easily with other elements.
A: M
B: N
C: O
D: P
Elements that belong to the same group of the Period Table
A: M and N
B: M and Q
C: O and Q
D: N and O
Determine the formula of the compound formed between M and N
A: M₂N₂
B: MN
C: MN₂
D: M₂N
Give the formula of the fifth member of the homologous series with general formula C_nH_2n+2
A: C₅H₁₂
B: C₅H₁₀
C: C₅H₁₁
D: C₅H₈
Name two air pollutants which are responsible for acid rain.
A: N₂ and S0₂
B: NO₂ and C0₂
C: C0₂ and SCT
D: S0₂ and N0₂
Which of the following substances will burn with a smoky and luminous flame?
A: Propane
B: Ethene
C: Hydrogen
D: Butane
Calculate the amount of substance in moles in250cnv³ of 0.IM HCI_(aq).
A: 0.05
B: 0.25
C: 0.025
D: 0.5
When excess carbon dioxide is passed through lime water, the milky colour disappears due to the formation of
A: Ca(HC0₃)₂
B: CaCO₃
C: CaO
D: Ca(OH)₂
What is the colour imparted to a Bunsen flame by a copper (II) salt?
A: Bluish green
B: Apple green
C: Golden yellow
D: Brick red