Chemistry Past Questions and Answers

Sodium chloride may be obtained from brine by

20 cm <sup style='font-size: smaller;'>3</sup> of hydrogen gas are sparked with 20cm <sup style='font-size: smaller;'>3</sup> of oxygen gas in an endimoeter at 373k (100 <sup style='font-size: smaller;'>o</sup>C) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 <sup style='font-size: smaller;'>o</sup>C) and passed over calcium chloride. The volume of the residual gas is

For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)

A molar solution of caustic soda is prepared by dissolving

Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?