Question

When copper [II] nitrate is heated in a hard glass test tube:
(i) State the colour change in crystal on heating.
(ii) State the colour of gas evolved which turns KI paper brown.
(iii) the coulourless gas evolved on heating turns a colourless solution brown when absorbed in it name the colourless solution
(iv) give balanced equation for the reaction ​

Answer 1

Answer:

1. black residue left.
2. reddish brown fumes
3. alkaline pyrogallol solution
4. 2Cu(NO3)2(s) → 2CuO(s) + 4NO2(g) + O2(g).