Chemistry Past Questions and Answers

A current of 10.0A was passed for 1 hour through a solution of copper (ll) sulphate between the copper electrodes. Which of the following observation would be correct?<br/>(1 Faraday = 96,500 coulobms) (i) 0.186 mole of copper is dissolved from the anode. (ii) 0.372 mole of copper is deposited on the cathode. (iii) the original Cu<sup style='font-size: smaller;'>2+</sup> ion concentration of the solution remains unchanged. (iv) the original Cu<sup style='font-size: smaller;'>2+</sup> ion concentration of the solution decreases.

In the preparation of carbon monoxide by heating ethanedioic acid with concentrated sulphuric acid, the concentrated sulphuric acid act as?

When copper powder is heated with concentrated sulphuric acid, the gas produced is?

Magnesium ribbon was added to each of the following aqueous solution in turn: H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>, AgNO<sub style='font-size: smaller;'>3</sub>, HNO<sub style='font-size: smaller;'>3</sub>, HCl, NH<sub style='font-size: smaller;'>3</sub>, HCl, NH<sub style='font-size: smaller;'>3</sub>. In which case does the magnesium become covered with a dark precipitate?

How many grams of methylacetylene (propyne) CH<sub style='font-size: smaller;'>3</sub> – C Ξ CH will completely discharge the colour of 8g of bromine?<br/>(Br = 80, C = 12, H = 1)