When `Kbr` is treated with concentrated `H_(2)SO_(4)` reddich brown gas evolved, gas is

When KBr is treated with conc. H_(2)SO_(4) reddish-brown gas is evolved. The gas is

When KBr is treated with conc. H_2SO_4 a reddish brown gas is evolved. The gas coming out is

A test tube containing a nitrate and another containing a bromide and MnO_(2) are treated with concentrated H_(2)SO_(4) . The reddish brown fumes evolved are passed through water. The water will be coloured by :

When formic acid is heated with concentrated H_(2)SO_(4) , the gas evolved is

KBr, on reaction with conc. H_(2)SO_(4) , gives reddish-brown gas :