Chemistry Past Questions And Answers
Consider the following reaction equation: Br2+2KI→2KBr+I2. Bromine is acting as
- A. an oxidizing agent
- B. a reducing agent
- C. an acid
- D. a base
The valence electrons of12Mg are in the
- A. 3s orbital
- B. 2px
- C. 2s orbital
- D. 1s orbital
CH\(_3\)CO\(_2\)H + CH\(_3\)CH\(_2\)OH \(\rightarrow\) ? The functional group under and in the equation is a/an _______ group
- A) Alkanol
- B) Carbonyl
- C) Keto
- D) Carboxylic acid
In the periodic table all elements within the same group have the same
- A. number of neutrons
- B. number of valence electrons
- C. number of isotopes
- D. atomic number
(a)(i) List three characteristic properties of transition metals
(ii) 0.45g of a metal M was deposited when a current of 1.8 amperes was passed for 12.5 minutes through a solution containing M\(^{2+}\). Calculate the relative atomic mass of M. [1 Faraday = 96500 C]
(iii) Give the reason why copper-plated iron corrodes easily when the surface is scratched.
(b)(i) State the law of definite proportions (constant composition).
(ii) Describe in outline, an experimental procedure for determining the proportion of oxygen in a given sample of copper(II) oxide.
(iii) Write an equation to show how copper (II) oxide can be obtained directly from copper (II) trioxonitrate (V)
View Discussion (0)WAEC 1997 THEORYThe bond formed between H2O and H+ to form the hydroxonium H3O+ is
- A. Dative
- B. Covalent
- C. Electrovalent
- D. Ionic
The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180oC is
- A. cyclohexane
- B. cyclopentane
- C. n- hexane
- D. n - pentane
Insoluble salts can be prepared by
- A. titrating an alkali against an appropriate acid
- B. reacting an acid with trioxocarbonatr (IV) salt
- C. directing combination of the elements which make up the salt
- D. mixing two soluble compounds containing the metallic radical and the acidic radical
Which of the noble gases has the greatest ionization energy
- A) He
- B) Xe
- C) Ar
- D) Rr
As the difference in electronegativity between bonded atoms increases, polarity of the bond?
- A. decreases
- B. increases
- C. remains unchanged
- D. reduces to zero