Chemistry Past Questions and Answers

A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>. Substance Z is?

Ammonia gas is normally dried with?

What are the values of x, y and z respectively in the equation: xCu + yHNO<sub style='font-size: smaller;'>3</sub> → xCu(NO<sub style='font-size: smaller;'>3</sub>)<sub style='font-size: smaller;'>2</sub> + 4H<sub style='font-size: smaller;'>2</sub>O + zNO?

The iron (III) oxide impurity in bauxite can be removed by?

Which of the following does NOT contain aluminium as component?