A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table?
- A. Group ll
- B. Group llI
- C. d-block
- D. s-block
One of the characteristics of transition metals is
- A. reducing ability
- B. ductility
- C. ability to conduct electricity
- D. formation of coloured ions
A nuclide emits a beta-particle (e) in the process, that atomic number
- A. increases by 1 while the mass numer remains constant
- B. decreases by 2 while the mass number remains constant
- C. remains constant while the mass number decreases by 2
- D. remains constant while the mass number increases by 1
Which of the electrons in the following orbitals will experience the greatest nuclear attraction?
- A. 1s electron of helium
- B. 1s electron of potassium
- C. 23 electron of boron
- D. 2s electron of carbon
Which of the following properties of elements deceases generally across a period in the Periodic Table?
- A. Electronegativy
- B. Electron affinity
- C. Atomic radluc
- D. lonlzation energy
Which of the following electron transition results in the emission of energy?
- A. 3p to 3s
- B. 3p to 4p
- C. 2s to 2p
- D. 1s to 2s
The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?
- A. 13 electrons and 14 protons
- B. 13 neutrons and 14 protons
- C. 13 protons and 14 neutrons
- D. 13 electrons and 14 neutrons
Which of the following processes will pollute water?
- A. Exposure of a body of water ultraviolet rays
- B. Discharge of industrial effluents effluents into water ways
- C. Passage of river water through a send bed
- D. Addition of a measured quantity of chlorine to water
What are the two gases associated with the formation of acid rain?
- A. CO2 and HCI
- B. CO2 and N2
- C. CO2 and NO2
- D. HCI ans SO2
When a sample of water was boiled, it lathered more readily with soap. it can be concluded that the sample most likely contained
- A. magnesium tetraoxosulphate (VI)
- B. suspended solids
- C. Organic impurities
- D. calcium hydrogentrioxocarbonate (IV)
What is the main impurity in haematite?
- A. CaSiO3
- B. CaCO3
- C. SiO3
- D. Fe2O3
Which of the following compound is used for removing impurities from bauxite?
- A. NaOH
- B. CaCO3
- C. Na3AIF6
- D. H2SO4
What volume of 0.20 mol dm -3 NaOH solution would yield 5.0 g of NaOH on evaporation to dryness? [NaOH = 40g mol-1]
- A. 400 cm3
- B. 625 cm3
- C. 1000 cm3
- D. 1600 cm 3
When excess ethene is shaken with acidified KMnO4 solution, the product obtained is
- A. ethane
- B. ethanal
- C. ethane - 1, 2 - diol
- D. ethanoic acid
What process does the following equation represent ? n(C\(_{6}\)H\(_{10}\)O\(_{5}\)) + nH\(_{2}\)O → nC\(_{6}\)H\(_{12}\)O\(_{6}\) ?
- A. Polymerization of glucose
- B. Hydrolysis of starch
- C. Fermentation of sugar
- D. Dehydration of carbohydates
The reaction of vegetable oil with a solution of wood ash is
- A. saponification
- B. neutralization
- C. hydrogenation
- D. esterification
What is the organic product of the reaction of C2H 5OH with excess acidified K 2Cr 2O7(aq)?
- A. CH3COOH
- B. C2H5OC2H5
- C. HCOOCH 3
- D. C2H5CHO
Which of the following substances could be responsible for the banana taste of a food flavour?
- A. Methylbenzene
- B. Butanol
- C. Ethanol
- D. Pentylethanoate
Wine containing 8% to 17% ethanol can be converted to gin containing about 40% ethanol by
- A. evaporation
- B. distilation
- C. fermentation
- D. oxidation
A given fuel has an octane number of 100. This means that
- A. the knocking tendency of the fuel is low
- B. the fuel is a mixture of several hydrocarbons
- C. a large amount of alkanes is present in the fuel
- D. the fuel needs to be cracked before use
Which of the following compounds has the same empirical formula as benzene?
- A. C2H2
- B. C2H4
- C. C4H6
- D. C6H12