Give a chemical test to distinguish between :
NaCl soln. and NaNO3 soln.
HCl gas and H2S gas.
Calcium nitrate soln. and zinc nitrate soln.
Carbon dioxide gas and sulphur dioxide gas.
Add silver nitrate solution to sodium chloride solution and sodium nitrate solution. In case of sodium chloride, a curdy white ppt. is formed. In case of sodium nitrate solution the reaction mixture *** colourless.
Moist lead acetate paper turns ***** in case of hydrogen sulphide gas, but does not change its colour in case of hydrogen chloride gas.
To each of the solution add first sodium hydroxide solution in small amount and then in excess. In case of calcium y nitrate a fine white precipitate is formed, which does not dissolve in excess of sodium hydroxide. In case of zinc nitrate a gelatin like white precipitate is formed which dissolves in excess of sodium hydroxide.
To each of the gas add few drops of acidified potassium dichromate solution. In case of carbon dioxide no change takes place. In case of sulphur dioxide, potassium dichromate solution turns blue.
