Why does distilled water not conduct electricity, whereas rain water does ?
Distilled water is a pure form of water and is devoid of any ionic species. Therefore, it does not conduct electricity. Rain water, being an impure form of water, contains many ionic species such as acids and therefore it conducts electricity.
Metal compound $A$ reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
Why does dry $HCl$ gas not change the colour of the dry litmus paper ?
A solution reacts with crushed egg-shells to give a gas that turns lime water milky. The solution contains
What will happen if a solution of sodium hydrocarbonate is heated ? Give the equation of the reaction involved.
A milkman adds a very small amount of baking soda to fresh milk.
$(a)$ Why does he shift the $pH$ of the fresh milk from $6$ to slightly alkaline ?
$(b)$ Why does this milk take a long time to set as curd ?