A water boiler in a factory burst due to high interior pressure. It was reported that the incident was occurred due to certain dissolved salt in water used. As a chemistry student how will you explain this?

Raju noticed that while washing clothes by using rain water collected in a tank, the quantity of soap required was found to be less than that required using tap water. a. If Raju asked the reason behind it, how will you explain it? b. Also mention any two methods to overcome.it,

A student is advised to study the variation of period of oscillation with the length of a simple pendulum in the laboratory. Accordingly he recorded the period of oscillation for different lengths of the pendulum. How would you determine the value of acceleration due to gravity using L-T^2 graph?

Some substances when dissolved in water cause hardness of water. Sodium chloride, Calcium bicarbonate, Calcium carbonate, Calcium sulphate, Magnesium sulphate, Calcium chloride, Magnesium carbonate. The hardness due to which of the above salts cannot be removed by boiling?

4g of NaOH is dissolved in water and the volume is made upto 1 L. (1 mole of NaOH = 40 g) How will you make 1 M solution of NaOH using the same amount (4g) of NaOH?