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'Softening of lead' means
- Aconversion of lead to $PbO$
- Bconversion of lead to $Pb_3O_4$
- Cremoval of impurities (metallic) from lead
- Dwashing lead with $HNO_3$ followed by alkali solution
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Similar Questions
In the electrolytic refining of zinc,
Blister copper is refined by stirring molten impure metal with green logs of wood because such wood liberates hydrocarbon gases (like $CH_4$). This process $X$ is called . . . . . . . . . and the metal contains impurities of $Y$ is . . . . . . . . .
Which of the following sets are correctly matched?
Metal Refining Process $I$. $Hg$ (Mercury) Distillation $II$. $Cu$ (Copper) Poling $III$. $B$ (Boron) Zone refining $IV$. $Ti$ (Titanium) Liquation
| Metal | Refining Process |
|---|---|
| $I$. $Hg$ (Mercury) | Distillation |
| $II$. $Cu$ (Copper) | Poling |
| $III$. $B$ (Boron) | Zone refining |
| $IV$. $Ti$ (Titanium) | Liquation |
The method used for producing semiconductor grade metals of high purity is
Match the following items of List-$I$ with those of List-$II$:
List-$I$ List-$II$ $(A)$ Nickel $(1)$ Electrolytic refining $(B)$ Titanium $(2)$ Zone refining $(C)$ Germanium $(3)$ van-Arkel method $(D)$ Copper $(4)$ Mond process
The correct answer is:
| List-$I$ | List-$II$ |
|---|---|
| $(A)$ Nickel | $(1)$ Electrolytic refining |
| $(B)$ Titanium | $(2)$ Zone refining |
| $(C)$ Germanium | $(3)$ van-Arkel method |
| $(D)$ Copper | $(4)$ Mond process |
The correct answer is:
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