Explain the following :  (a) An acidified `K_2 Cr_2 O_7` paper turns green when exposed to
Channel: Doubtnut
Date: 26/07/2020

Explain the following :  (a) An acidified `K_2 Cr_2 O_7` paper turns green when exposed to `SO_2`.  (b) `H_2 S` acts only as reducing agent while `SO_2` can act both as a reducing agent and an oxidising agent.  (c) `SO_2` acts as a bleaching agent.  (d) Sugar turns black on addition of conc. `H_2 SO_4`.  (e) Ozone destroys mercury meniscus.  (f) `SF_6` is known, but `SH_6` is not known.