Question

State one example each along-with the chemical equation characterized
by the following:
(i) Formation of Precipitate
(ii) Evolution of gas
(iii) Change in temperature​

Answer 1

Answer:

Explanation:

i) Evolution of gas--- Reaction between zinc and dilute sulphuric acid

ex.- Zn+H2SO4-ZnSO4+H2ii) Change in color--- Reaction between citric acid and purple coloured potassium permanganate solution gives colourless solution.iii) Formation of precipitate--- Reaction between potassium iodide and lead nitrate forms a yellow precipitate of lead iodide.

ex.- Pb(NO3)2+2KI-PbI2+2KNO3iv) Change in temperature: Reaction between zinc granules and dliute hydrochloric acid.

ex.- Zn+H2SO4-ZnSO4+H2(high temperature because heat is released)v) Change in state: Combustion of candle wax is characterized by a change in state from solid to liquid and gas

Answer 2

Answer:

a ) ex. NA2SO4 +BACL2--- BASO4+2NA4

(PRECIPITATE)

b ) ex. C + O2------ CO2