Chemistry
Aqua regia is a 1 : 3 mixture, by volume, of

Conc. sulphuric acid and conc. nitric acid
Conc. hydrochloric acid and conc. nitric acid
Conc. nitric acid and conc. sulphuric acid
Conc. nitric acid and conc. hydrochloric acid

ANSWER DOWNLOAD EXAMIANS APP

Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Tendency of carbon dioxide to form a layer along with dust smoke
Accumulation of smoke and dust over the sigrees
Interrupted release of moisture from the material
Lack of oxygen in the surroundings of sigrees

ANSWER DOWNLOAD EXAMIANS APP