CBSE
Multiple Choice QuestionsThe element which is the most abundant in the earth crust is
O
S
Al
H
The iron, obtained from blast furnace is :
pig iron
cast iron
wrought iron
steel
Which of the following is not an ore of magnesium ?
Magnesite
Dolomite
Gypsum
Carnalite
Assertion : Extraction of iron metal from iron oxide ore is carried out by heating with coke.
Reason : The reaction Fe2O3 (s) → Fe (s) + O2 (g) is a spontaneous process.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The purification of alumina is called
Baeyer's process
Bosch process
Castuer process
Hoop's process.
Which of the following dissolves in hot conc. NaOH solution ?
Fe
Zn
Cn
Ag
Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of metals?
FeO, SnO
SnO, ZnO
BaO, Na2O2
FeO, ZnO
Reagent used to extract silver from Ag2S is :
NaCN
NaCN in presence of O2
NaCl
AgNO3
Given below, catalyst and corresponding process/ reaction are matched. The mismatch is
[RhCl(PPh3)2] : Hydrogenation
TiCl4+ Al(C2H5)3 : Polymerization
V2O5 : Haber-Bosch process
nickel : Hydrogenation.
In Mc Arthur Forest method , silver is extracted from the solution of Na[Ag(CN)2] by the use of :
Fe
Mg
Cu
Zn
