Which of the following apparatus can be used to measure a specific volume of a liquid correctly?

Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of sand, water and methanoic acid?

The minimum amount of energy required for effective collisions between reacting particles is known as:

If concentrated sulphuric acid is added to sugar and warmed gently, the sugar changes from brown to white and finally to a black mass of carbon. In this reaction, concentrated sulphuric acid is acting as