Chemistry

What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3 g of the compound? (Na2CO3 = 106)

A. 0.05 B. 0.10 C. 0.20 D. 0.50 E. 2.00 Correct Answer: Option A - 0.05

5 years ago

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

5 years ago

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

5 years ago

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

5 years ago

The metal extracted from cassiterite is?

A. calcium B. copper C. tin D. sodium E. lead Correct Answer: Option C - tin

5 years ago

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.…

5 years ago

A dye is suspected to have contaminated a lollipop. Which of the following is the best method by which the contaminant may be isolated?

A. Fractional distillational B. Recrystallization C. Filtration D. Paper chromatography E. Evaporation Correct Answer: Option D - Paper chromatography

5 years ago

Which of the following groups contains entirely linear molecules?

A. H2NH3O2 B. CO2NH3O2 C. H2CH4N2 D. CO2H2N2 E. CH4O2CO2 Correct Answer: Option D - CO2H2N2

5 years ago

The product of the reaction between propanoic acid and ethanol is?

A. prophlmethanoate B. ethylethanoate C. methylpropanoate D. propylethanoate E. ethylpropanoate Correct Answer: Option E - ethylpropanoate

5 years ago

Which of the following minerals contains fluorine as one of its constituent elements?

A. Cryolite B. Bauxite C. Potash alum D. Kaolin E. Mica Correct Answer: Option A - Cryolite

5 years ago
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