Chemistry
(i) Which concentrated acid will oxidize sulphur directly to sulphuric acid ? Write the equation for the same.
(ii) Complete the following : concentrated sulphuric acid is used in the laboratory preparation of nitric acid and hydrochloric acid because it is — (less volatile/stronger) in comparison to these two acids.
(iii) Write the observation and the balanced equation, when a paper dipped in acidified potassium dichromate solution is put on the mouth of a test tube containing sulphur dioxide gas.
Sulphuric Acid
1 Like
Answer
(i) Hot and conc. nitric acid.
S + 6HNO3 ⟶ H2SO4 + 2H2O + 6NO2
(ii) Concentrated sulphuric acid is used in the laboratory preparation of nitric acid and hydrochloric acid because it is less volatile in comparison to these two acids.
(iii) Acidified potassium dichromate solution changes to green colour from orange colour.
K2Cr2O7 + H2SO4 + 3SO2 ⟶ K2SO4 + Cr2(SO4)3 + H2O
Answered By
1 Like
Related Questions
Within a Group, where would you expect to find the element with :
(i) the greatest metallic character ?
(ii) the largest atomic size ?
Define ionisation potential ? State whether it increases on going down a group.
Give equations for the following :
(i) Preparation of acetylene
(ii) Preparation of ethyl alcohol
(iii) Addition of chlorine to ethylene
(iv) Preparation of ethane
(v) Sulphurous acid reacts with bromine.
Complete and balance the following:
(i) Potassium nitrate + sulphuric acid ⟶
(ii) Ferrous chloride + Ammonium hydroxide ⟶
(iii) Red lead + conc. HCl ⟶
(iv) Sodium thiosulphate + dilute Hydrochloric acid ⟶
(v) Copper with dil nitric acid ⟶