Question

Consider the following statements:
(a) In extraction of $Fe,Si{O}_2$ is flux
(b) Tin is purified by liquation
(c) Bauxite is purified by chemical separation
(d) Silver turns black due to formation of $A{g}_{2}O$
Which of the above statement(s) is/are correct?

• A. Only (d)
• B. Only (a)
• C. (b) and (c)
• D. (a) and (d)

Answer 1

Answer: (C)

(b) and (c)

In extraction of iron flux is $CaO$ which reacts with silicate to form slag $\left(CaSi{O}_3\right)$.
$CaO+Si{O}_2\to CaSi{O}_3$
(Flux) Slag
Silver turns black due to formation of $A{g}_{2}S$
$2Ag\left(s\right)+H_{2}S\left(g\right)\to A{g}_{2}S\left(s\right)+H_2\left(g\right)$