Difference between a skeletal equation and balanced equation with examples.

Iron is more reactive than copper. Write activity to show this.

A compound 'X' is bitter to taste.It is a compound of washing powder and reacts with dilute HCl to produce brisk effervescence due to a colourless and odourless gas 'Y' which turns lime water milky due to the formation of 'Z' when an excess of CO2 is passed milkiness disappear due to the formation of 'P'. Identify 'X' 'Y' 'Z' and 'P" . write the equation in the formation of Y Z and P.

Silver chloride turns grey when kept in sunlight. Give reason.

Can a combination reaction be redox reaction? Give an example in support of your answer.