2023
a. Describe how iron and aluminum reacts with each of the following substances: i. dilute \(H_2SO_4\); ii. dilute \(HNO_3\) bi. Write an equation for the burning of sulphur in air. ii. Name the catalyst used in the co…
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2023 WAEC SSCE Chemistry Past Questions
2023
a. Starting with calcium chloride, describe briefly how a solid sample of calcium trioxocarbonate (IV) can be prepared in the laboratory. b. With relevant equations outline the procedure for the purification of impure co…
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2023
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…
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2023
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. calcul…
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2023
a. What is a transition element? b. Consider the electron configuration of the following elements: A=2, 8,6; B=2,8,2; C=2,8,1, D=2,8,8 State the element which forms a: i. doubly charged cation; ii. soluble trioxocarbonat…
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2023
How many moles of copper would be deposited by passing 1 Faraday of electricity through a \(CuCl_2\) solution?
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2023
How many grammes of NaOH(s) would be needed to produce 100.0 cm3 of a 0.20 mol dm-3 NaOH, (aq)? [NaOH = 40.0]
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2023
Thermal cracking of alkanes usually
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2023
The relative molar mass of a gaseous hydrocarbon is 30. Determine its vapour density.
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2023
The best indicator to use for the titration of ethanoic acid with sodium hydroxide is
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2023
An example of a crystalline substance that does not possess water of crystallization is
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2023
Which of the following gases has the lowest rate of diffusion? [H=1.0, C=12.0, N = 14.0, O= 16.0]
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2023
Isoelectronic species have the same number of
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2023
Why are \(H_2SO_4\) and \(CaCl_2\), not suitable for drying ammonia gas? They
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2023
The reduction half equation of the following reaction is: \(Zn_{(s)} + CuSO_{4(aq)} → ZnSO_{4(aq)} + Cu_{(s)}\)
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2023
The molecule that has a non-polar covalent bond is
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2023
Petrochemistry is an example of
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2023
Which of the following elements has its valence electrons in the s-orbital?
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2023
Which of the following statements about the collision theory is correct?
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2023
An element X has two isotopes, \(^{65}X_{30}\) and \(^{66}X_{30}\) with relative abundance of 60 % and 40% respectively. The relative atomic mass of X is
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