Question

Give two equation of the following
Change in state
Change in color
Evolution of gas
Change in tenpreature

Answer 1

i) Evolution of gas--- Reaction between zinc and dilute sulphuric acidii) Change in color--- Reaction between citric acid and purple colored potassium permanganate solution gives colourless solution.iii) Formation of precipitate--- Reaction between potassium iodide and lead nitrate forms a yellow precipitate of lead iodide.iv) Change in temperature: Reaction between zinc granules and dliute hydrochloric acid.v) Change in state: Combustion of candle wax is characterized by a change in state from solid to liquid and gas

Answer 2

1) melting of ice into water.

2) when white silver chloride exposed to sunlight it change its colour in black.

3) when zinc metal is reacted with HCl it produce hydrogen gas and zinc chloride.