Question

Bromine occurs as a bromide in a mineral called:
(A) Nitre
(B) Tincal
(C) Common salt
(D) Carnallite

Answer 1

Hint: Bromine is a chemical element in the periodic table which is denoted by Br while Bromide is the anion that forms when bromine abstracts an electron from another electropositive element. Moreover, the key difference between bromine and bromide is that bromide is the reduced form of bromine.

Complete answer:
Carnallite is mainly the double salt which contains $ 0.2\% $ bromine in the form of bromides. Its formula is \[KCl.MgC{l_2}(MgB{r_2}).6{H_2}O\]. Natural deposits of carnallite contain small amounts of $ KBr $ and $ MgB{r_2} $ as impurities. Bromine is manufactured from carnallite.
.Bromine is manufactured from carnallite as: Carnallite is dissolved in water and the solution is concentrated and cooled to separate crystals of $ KCl $ and $ MgC{l_2} $ . The hot mother liquor is allowed to flow down through a tower packed with earthenware balls. A current of chlorine is passed from the bottom. It displaces bromine which is carried upwards by steam.
\[MgB{r_2} + C{l_2} \to MgC{l_2} + B{r_2}\]
The vapor of bromine is condensed by a spiral condenser.
In laboratory:
 $ Br + conc.{H_2}S{O_4} + $ heat $ \to $ Reddish brown fumes $ + $ white acidic fumes which gives pale yellow ppt. with $ AgN{O_3} $
 $ {H_2}S + B{r_2} \to 2HBr + S $ .

Note:
Carnallite is generally utilized in composts. It is a significant wellspring of potash. Only sylvite outclasses carnallite's significance in potash production. Both are remarkable on the grounds that they are a portion of the last evaporites to form. Soluble potassium salts are the primary hotspots for manure. This is because the potassium is difficult to separate from insoluble potassium feldspar.