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
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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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