Which substance is formed when ammonia gas reacts with hydrogen chloride gas?

Write one equation each for decomposition reactions where energy is supplied in the form of heat,light,or electricity.

Write two observations for the following chemical reaction:
$(a)$ Potassium iodide solution is added to lead nitrate solution.

Which two observations will be made when quicklime is added to water? Mention two uses of the product obtained.

Which one is a chemical change: Fermentation of fruit juice or diluting fruit juice?

State whether the following statement is true or false:
The decomposition reaction of silver bromide into silver and bromine by light is used in the manufacturing of cement.