Chemistry Past Questions and Answers

If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be?

A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging?

A certain industrial process is represented by the chemical equation 2A<sub style='font-size: smaller;'>(g)</sub> + B<sub style='font-size: smaller;'>(g)</sub> \(\to\) C<sub style='font-size: smaller;'>(g)</sub> + 3D<sub style='font-size: smaller;'>(g)</sub> \(\Delta\)H = X kJmol<sup style='font-size: smaller;'>-1</sup>. Which of the following conditions will favour the yield of the products?

2MnO<sup style='font-size: smaller;'>-</sup><sub style='font-size: smaller;'>4</sub> + 10Cl<sup style='font-size: smaller;'>-</sup> + 16H<sup style='font-size: smaller;'>+</sup> → 2Mn<sup style='font-size: smaller;'>2+</sup> + 5Cl<sub style='font-size: smaller;'>2</sub> + 8H<sub style='font-size: smaller;'>2</sub>O. Which of the substances serves as an oxidizing agent?

Which of the following metals will displace iron from a solution of iron(ll)tetraoxosulphate(lV)?