Some metallic oxides can be reduced by hydrogen, carbon and carbo… - Vidyadip

Question

Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. explain

✓

Answer

Oxides of highly active metals like potassium, sodium, calcium, magnesium and aluminium have a great affinity towards oxygen and so cannot be reduced by carbon or carbon monoxide or hydrogen.
Metals in the middle of activity series (iron, zinc, lead, copper) are moderately reactive and are not found in oxide form. These are found in nature as sulphides or carbonate. These are first converted into oxides and can be reduced by $C _1 CO$ or $H _2$.
$ZnO + C \xrightarrow{400^{\circ} C } Zn + CO$
$PbO + CO \xrightarrow{\Delta} Pb + CO _2$
Metals low in the activity series is very less reactive and oxides of these metals are reduced to metals by heating alone.

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

What would be the mass of $CO_2$ occupying a volume of $44$ litres at $25^0 C$ and $750$ mm pressure?

Common salt solution is added to silver nitrate solution and $NH_3$ solution add to it.

Draw an electron dot diagram to show the formation of the following compound.
Methane

What is the difference between :
Ionic compounds and covalent compounds

The following is a list of methods for the preparation of salts.
A – direct combination of two elements
B – reaction of a dilute acid with a metal.
C – reaction of a dilute acid with an insoluble base.
D – titration of a dilute acid with a solution of soluble base.
E – reaction of two solutions of salts to form a precipitate.
Choose from the above list A to E, the best method of preparing the following salts by giving a suitable equation in each case:
1. Anhydrous ferric chloride,
2. Lead chloride,
3. Sodium sulphate.
4. Copper sulphate.

State two chemical properties each with equations for (i) a solution containing H⁺(aq) ions (ii) a solution containing OH^- ions.

The action of heat on the blue crystalline solid X gives a reddish brown gas Y, a gas which re-lights a glowing splint and leaves a black residue. When gas Z, which has a rotten egg smell, is passed through a solution of X, a black ppt. is formed.

Identify X, Y and Z.
Write the equation for action of heat on X.
Write the equation between solution X and gas Z.

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid.How many moles of HCl are used in this reaction

Calculate the percentage of platinum in ammonium chloroplatinate $(NH_4)_2PtCl_6.$
$[N = 14, H = 1, Pt = 195, Cl =35.5]$
$($Give your answer correct to the nearest whole number$)$

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 :
$3CuO + 2NH_{3 }\rightarrow 3Cu + 3H_2O + N_2$