Explain why chlorine turns moist starch iodide paper blue-black.

State three tests by which you could identify a gas as being chlorine.

For the elements sodium and phosphorous, state the following

(a) the formula of the chloride of each element,

(b) the physical state of each chloride at room temperature (i.e., solid, liquid or gas), and

(c) the nature of bonding of each chloride (i.e., ionic or covalent)

Describe the two colour changes that take place when moist blue litmus is placed in a gas jar of chlorine. What are these colour changes that take place when chlorine water is exposed to sunlight?