It is found, on heating a gas, its volume increases by 50% and pressure decreases to 60% of its original value. If the original temperature was -15°C, find the temperature to which it was heated?

(i) What causes the violence associated with torrential rain?

(ii) Which property of water enables it to modify the climate?

(iii) Explain why distilled water tastes flat.

Draw the solubility curve for KNO₃ and CaSO₄.

Name any two impurities present in the hydrogen gas prepared in the laboratory. Also name the chemical used to remove any one impurity that you have stated.