Give your observation :
Conc. `HNO_3` is poured on copper turnings.

Give your observation : Dilute nitric acid is added to copper oxide.

Write a balanced equation for the reaction of conc HNO_(3) when added to copper turnings kept in a beaker .

Give your observation : Nitric acid is added to cellulose.

Pb on reaction with conc. HNO_3 gives

Write your observations when ammonia water is added to copper sulphate solution first a little then in excess. Give balanced equations.

State your observation when: Dilute hydrochloric acid is added to copper carbonate.

Give an equation for reaction of conc HNO_(3) with (i) carbon (ii) copper .

What property of conc. H_2SO_4 is made use of in each of the following cases ? Give an equation for the reaction in each case : in the preparation of sulphur dioxide by warming a mixture of conc. sulphuric acid and copper turnings.

From the substances - Ammonium sulphate , Lead carbonate ,Chlorine ,Copper nitrate , Ferrous sulphate- State : A compound which releases a reddish brown gas on reaction with conc . H_(2)SO_(4) & copper turnings.

Conc. HNO_3 stains wood yellow because.