Which of the following types of bonding does not involve the formation of new substance?
- A. Metallic
- B. covalent
- C. Co-ordinate
- D. Electrovalent
The electron configuration of \(_{22}X^{2+}\) ion is
- A. 1s2 2s22p6 3s2 3p6 4s2 3d2
- B. 1s2 2s22p6 3s2 3p6 4s2 3d1
- C. 1s2 2s22p6 3s2 3p6
- D. 1s2 2s22p6 3s2 3p6 3d2
Which of the following statement is correct about the periodic table?
- A. Elements in the same period have the same number of valency electron
- B. The valence electron of the elements in the same period increase progressively across the period
- C. Elements in the same group have the same number of electron shells
- D. The non-metallic properties of the elements tend to decrease across each period
The fundamental difference between the three states of matter is the
- A. shape of their particles
- B. number of particles in each state
- C. shape of the container they occupy
- D. degree of movement of their particles
The partial pressure of oxygen in a sample of air is 452 mm Hg and the total pressure is 780 mm Hg. What is the mole fraction of oxygen?
- A. 0.203
- B. 0.579
- C. 2.030
- D. 5.790
The ratio of the initial to final pressure of a given mass of gas is 1:1.5. Calculate the final volume of the gas if the initial volume was 300 cm3 at the same temperature
- A. 120 cm3
- B. 200 cm3
- C. 450 cm3
- D. 750 cm3
How many moles of HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?
- A. 14
- B. 12
- C. 11
- D. 10
50 cm3 of carbon (II) oxide was exploded with 150 cm3 of air containing 20% oxygen by volume. Which of the reactants was in excess?
- A. Carbon (II) oxide
- B. Carbon (IV) oxide
- C. Oxygen
- D. Nitrogen
Which of the following compounds is composed of Al, Si, O and H?
- A. Epsom salt
- B. Limestone
- C. Clay
- D. Urea
Sieving is a technique used to separate mixture containing solid particles of
- A. small sizes
- B. large sizes
- C. different sizes
- D. the same sizes
A mixture of iodine and sulphur crystals can be separated by treatment with?
- A. Water to filter off sulphur
- B. carbon (IV) sulphide to filter off iodine
- C. ethanoic acid to filter off sulphur
- D. methanol to filter off iodine
When the two end alkyl groups ethyl ethanoate are interchange, the compound formed is known as
- A. methyl ethanoate
- B. ethyl propanaote
- C. methyl propanoate
- D. propyl ethanoate
An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be
- A. alkene
- B. alkanal
- C. alkanone
- D. alkanoic acid
POlyvinyl chloride is used to produce
- A. bread
- B. pencils
- C. ink
- D. pipes
When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is
- A. ethyne
- B. diethyl sulphate
- C. diethyl ether
- D. acetone
Which of the following is a solvent for perfumes?
- A. C5H12
- B. C4H6
- C. CH3COOH
- D. C2H5OH
2-methylprop-1-ene is an isomer of
- A. but-2-ene
- B. pent-1-ene
- C. 2-methylbut-2-ene
- D. 2-methylbut-1-ene
The hydrocarbon that burns in air with a sooty flames is
- A. C2H6
- B. C3H8
- C. C4H10
- D. C6H6
Which of the following metals is passive to concentrated trioxonitrate (V) acid?
- A. Iron
- B. Tin
- C. Copper
- D. Zinc
A metal that can be extracted from cassitertite is
- A. cacium
- B. magnesium
- C. tin
- D. copper
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is
- A. magnesium and zinc
- B. magnesium and calcium
- C. copper and zinc
- D. lead and calcium