Question

(7) When a white powder was mixed with dilute acid, odourless gas was produced
which turned lime water milky. The powder may be
-carbonate
-bicarbonate
-sulphate

-carbonate or bicarbonate.
Other:
(8) When iron nail js kept in blue coloured copper sulphate solution, after a while
the colour obtained in the test tube for the solution is
blue
brown
green​

Answer 1

Answer:

7. carbonate

8. brown colour is obtained