Chemistry Past Questions and Answers

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)

What weight of sodium hydroxide is required to make 500 cm<sup style='font-size: smaller;'>3</sup> of 0.2 M solution?<br/>(Na = 23, O = 16, H = 1)