Chemistry Past Questions and Answers

The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?

5cm<sup style='font-size: smaller;'>3</sup> of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?<br/>(Na = 23, Cl = 35.5)

In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?

Pure sulphuric acid is a liquid of 1:84 density. What volume of it would be required to prepare 250 cm<sup style='font-size: smaller;'>3</sup> of 2.0 M solution?<br/>(H = 1, S = 32, O = 16)

What mass of sodium carbonate solution is in 500 cm<sup style='font-size: smaller;'>3</sup> of 0.1 molar sodium carbonate solution?<br/>(Na = 23, C = 12, O = 16)