2022
(a) Describe the observation that would be made when-----i. Sulphur is heated from room temperature till 1190C ii. 50% trioxonitrate(V) acid acts on copper tunings(b)i. State two gaseous pollutants that can be generated…
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2022 WAEC SSCE Chemistry Past Questions
2022
(a)i. State two conditions used in the Haber processii. Explain briefly the effect of increasing the pressure on the rate of reaction in the Haber process.(b)i. A mixture of nitrogen(IV) oxide and oxygen is bubbled into…
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2022
(a)i. Define an acid according to the Lewis conceptii. Give one example of a Lewis acid(b) Explain salting out in soap preparation(c) State the reagent and condition necessary for the following conversion H−C≡C−H Ag−C≡C−…
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2022
(a) (i) Define the term Avogadro's number.(ii) If 2.30 g of an oxide of nitrogen, x, contains 3.01 x 10\(^{22}\) molecules, calculate the molar mass of x.(iii) Deduce the formula of x. N, =6.02 x 10", N =14.0, O = 16.0](…
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2022
(a)(i) Define the first ionization energy of an element(ii) Consider the following table and use it to answer te question that followsElementLiBe bCNOFNeAtomic number3456789101st I.E/kj mol\(^{-1}\)5209008011086140213141…
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2022
Which of the following sketches is a graphical representation of Boyle's law?
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2022
Which of the following scientists formulated the law of conservation of mass?
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2022
The first definition of an element was made by
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2022
Charcoal is used in the decolourization of sugar because of its
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2022
If the molar mass of X(HCO3)\(_{2}\) is 162 g mol\(^{-1}\), determine the relative atomic mass of X. [H = 1.0, C = 12.0, 0 = 16.0]
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2022
Which of the following processes occur during fractional distillation of petroleum?
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2022
Which of the following oxides is amphoteric?
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2022
Consider the following tableSubstituteMeltig point /ºCBoiling point / ºCP- 78-25Q- 840R- 6150S44280 Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?
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2022
Electropositivity of elements across the periodic table normally
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2022
The atom with the electron configuration 1s\(^{2}\)2s\(^{2}\)2p63s\(^{2}\)3p\(^{6}\)3d\(^{10}\)4s\(^{2}\)4p\(^{4}\) is in
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2022
Which of the following statements about atoms of a metal is correct? They
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2022
An oxide has the following properties. It I. is a white powder II. reacts with HCI. III. reacts with NaOH IV. is insoluble in water The oxide is
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2022
The electron configuration of carbon atom in its excited state is
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2022
Which of the following properties indicate that an element is a metal. It I. reacts with oxygen to form an acidic oxide II. forms ionic chlorides III. has variable oxidation states IV. displaces hydrogen from dilute HCl
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2022
Ionization energy increases across the period in the periodic table because
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