Give a chemical test for a) an oxidising agent b) a reducing agent
Answers
Answer
____________________
a) an oxidising agent
Most oxidising agents respond to the following tests:-
(i) On heating strongly, they liberate oxygen, which rekindles a glowing splinter.
(ii) They make a yellow precipitate of sulphur when hydrogen sulphide is bubbled through their solutions.
(iii) On warming with conc. hydrochloric acid, they liberate chlorine, that bleaches moist litmus paper.
(iv) On treating with acidified potassium iodide solution, they liberate iodine, which imparts a blue colour to a fleshly-prepared starch solution (an oxidising agent also turns potassium iodide paper brown due to liberation of iodine).
____________________
b) Reducing agents
Reducing agents respond to the following tests:-
(i) They give out brown fumes of nitrogen dioxide, when warmed with nitric acid.
(ii) They change black copper (II) oxide, on heating, to a red copper metal.
(iii) They change the colour of acidified potassium dichromate solution from orange to red.
(iv) They decolourise the pink colour of dilute potassium permanganate solution.
(v) They change the light yellow colour of iron(III) salts in solution to a light green colour [due to the formation of iron (II) salts.
____________________
Explanation:
Thunderstorm, a violent short-lived weather disturbance that is almost always associated with lightning, thunder, dense clouds, heavy rain or hail, and strong gusty winds. ... Thunderstorms arise when layers of warm, moist air rise in a large, swift updraft to cooler regions of the atmosphere.