Select the incorrect statement.

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) $1$. Cerrusite is $PbCO_3$ (a carbonate ore),which is concentrated by gravity separation or froth floatation,but it is not the primary method. How

Vedclass · Accepted Answer

Roasting process is involved for extraction of iron.

Vedclass · Answer

(B) $1$. Cerrusite is $PbCO_3$ (a carbonate ore),which is concentrated by gravity separation or froth floatation,but it is not the primary method. However,statement $A$ is generally considered acceptable in some contexts. $2$. In the extraction of iron,the process involves calcination and smelting in a blast furnace,not roasting. Roasting is typically used for sulfide ores. Thus,statement $B$ is incorrect. $3$. Serpeck's process is used for the purification of bauxite $(Al_2O_3)$. The byproduct is $AlN$ (Aluminum Nitride),not silicon. Thus,statement $C$ is also incorrect. $4$. Cassiterite $(SnO_2)$ and Rutile $(TiO_2)$ are indeed oxide ores. Given the standard curriculum,both $B$ and $C$ contain inaccuracies,but $B$ is a fundamental error regarding iron metallurgy.

Column-$I$	Column-$II$
$P$. Nitriding	$I$. Process of heating steel to redness and then cooling it very slowly
$Q$. Annealing	$II$. Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel
$R$. Tempering	$III$. Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
$S$. Quenching	$IV$. Process of heating quenched steel to a temperature well below redness and then cooling it slowly

List-$I$ (Substances)	List-$II$ (Processes)
$A$. Sulphuric acid	$i$. Haber's process
$B$. Steel	$ii$. Bessemer's process
$C$. Sodium hydroxide	$iii$. Leblanc process
$D$. Ammonia	$iv$. Contact process

Similar Questions

Which alloy contains $Cu$,$Sn$,and $Zn$?

Bell metal is an alloy of

Bronze is a mixture of . . . . . . metals.

Vedclass Test Series

Exam Paper Generator

Online Exam Module