Chemistry Past Questions and Answers

For the reaction 2Fe<sup style='font-size: smaller;'>3+</sup> 2I<sup style='font-size: smaller;'>-</sup> \(\to\) 2Fe<sup style='font-size: smaller;'>2+</sup> + I<sub style='font-size: smaller;'>2</sub>, which of the following statements is TRUE?

In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is - 57.3kJ. Therefore the heat of the reaction 2NaOH + H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> \(\to\) Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2H<sub style='font-size: smaller;'>2</sub>O is

Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?

Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of

An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.