Download App

Metallurgy — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMetallurgy3 Marks
Question
Here are two metals obtained from extraction processes: Zn and Pb. What would be the refining processes applicable to purify them? Give the related principle of each.
✓

Answer

Zinc: Distillation. This process is employed for more volatile metals (having low boiling point) In this process, the impure metal is strongly heated in the absence of air. The metal vaporises, leaving behind impurities.
Lead: Liquation. This process is employed for metals having low melting points. The solid impure metal is placed in a hearth having a sloping floor. When the hearth is heated, metal melts and flows on the sloping floor.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[3 Mark Question Answer]" from Metallurgy→Metallurgy — all question types→Chemistry STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

How do metals differ from non-metals in :
(i) ion formation
(ii) electronic configuration
(iii) chemical nature of their oxides?
→
State the reactions occurring at anode during the electrolysis of :
(i) copper sulphate solution using copper anode.
(ii) copper sulphate solution using platinum anode.
(iii) dilute sulphuric acid using platinum anode.
→
Common salt solution is added to silver nitrate solution and $NH_3$ solution add to it.
→
Name three compounds formed by ethene and give one use of each compound.
→
Give composition and uses of the following alloys. Mention the reason for its use.
Duralumin
→
Given that the relative molecular mass of copper oxide is $80,$ what volume of ammonia $($measured at $\text{STP})$ is required to completely reduce $120g$ of copper oxide? The equation for the reaction is :
$3CuO + 2NH_{3 }\rightarrow 3Cu + 3H_2O + N_2$
→
A compound made up of two elements $X$ and $Y$ has an empirical formula $X_2Y.$ if the atomic weight of $X$ is $10$ and that $Y$ is $5$ and the compound has a vapour density $25,$ find its molecular formula.
→
A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula. [C = 12, H = 1]
→
Give the (i) common name, (ii) chemical formula and (iii) chemical name of two ores each of aluminium, zinc and iron.
→
Draw a labeled diagram to show how iron is electroplated with copper.
→