Browse Questions

# Which of the following statements is TRUE?

(1) Liquation is used for purification of low melting metals

(2) Oxidation is used when the impurities have lesser affinity for oxygen

(3) Hydraulic washing is used for concentration of magnetic ores

(4) Distillation is used for purification of low boiling volatile metals

$\begin{array}{1 1} (1) ,(2) and (4) only \\ All \;are\; correct \\ (2)\;and \;(4) \;only \\ (D) (1) and (4) Only.\end{array}$

(1) Liquation is used for purification of low melting metals $\rightarrow$ Liquation is used when the melting point of the metal to be purified is lower than those of impurities and the impurities are not miscible with the metal.
(2) Oxidation is used when the impurities have lesser affinity for oxygen $\rightarrow$ Oxidation is used in case of where the metals have greater affinity and undergo oxidation more readily than the metal itself.
(3) Hydraulic washing is used for concentration of magnetic ores $\rightarrow$ Hydraulic washing is used in case of non-magnetic ores where the impurities are washed away leaving behind the ore.
(4) Distillation is used for purification of low boiling volatile metals $\rightarrow$ This is true and used in cases of low boiling volatile metals. The pure metal distils and leaves behind the non-volatile impurities.
Answer: (1) and (4) are correct, while (2) and (3) are incorrect.