When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is?
A. carbon (IV) oxide B. nitrogen C. oxygen D. water vapour E. noble gases Correct Answer: Option C – oxygen
The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their?
A. physical states B. melting points C. Rf. values D. solubility E. boiling points Correct Answer: Option D – solubility
In which of the following is the oxidation number of nitrogen zero?
A. SO2 and NH3 B. NaNO3 C. HNO2 D. HNO3 E. N2 Correct Answer: Option E – N2
The metal extracted from cassiterite is?
A. calcium B. copper C. tin D. sodium E. lead Correct Answer: Option C – tin
Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?
A. Electrons are present in metals but not in salt solutions B. Metals are conductors while salts are electrolytes C. Electricity is carried by mobile elrctrons in metals but by ions is aqueous salt solution D. salts ionize in aqueous solutions while metals do not E....Products
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