Characterstic reactions for four different substances are given below. Arrange the tests in the order of the substances given below. (i) P_(2)O_(s) (ii) CO_(2) (iii) O_(2) (iv) SO_(2) (a) Passage through potassium dichromate turns green. (b) Dissolu in water gives tribasic acid. (c ) Non-supporter of combustion but allows active metals continue to burn. (d) Turns alkaline pyrogallol brown.

Characterstic reactions for four different substances are given below.

1.	Characterstic reactions for four different substances are given below. Arrange the tests in the order of the substances given below. (i) P_(2)O_(s) (ii) CO_(2) (iii) O_(2) (iv) SO_(2) (a) Passage through potassium dichromate turns green. (b) Dissolu in water gives tribasic acid. (c ) Non-supporter of combustion but allows active metals continue to burn. (d) Turns alkaline pyrogallol brown.
Answer» bdca bcda dacb dcab Solution :(i) `P_(2)O_(5)`on DISSOLUTION in water gives phosphoric acid. `CO_(2)` is a non-suporter of COMBUSTION,but allows burning of active metals. (iii) OXYGEN turns ALKALINE pyrogallol brown. (iv) `SO_(2)` When passed through potassium dichromate turns the solution from orange to green.