TN State Board Samacheer Kalvi Online Test for 12th Std - Chemistry - English - Metallurgy

Question 1 Of 10

The following set of reactions are used in refining Zirconium

Liquation Van Arkel process Zone refining Mond’s process

Question 2 Of 10

Which of the following statements, about the advantage of roasting of sulphide ore before the reduction is not true?

ΔG°f of sulphide is greater than those for CS2 and H2S ΔG°r is negative for roasting of sulphide ore to oxide Roasting of the sulphide to its oxide is thermodynamically feasible. Carbon and hydrogen are suitable reducing agents for metal sulphides.

Question 3 Of 10

In the electrolytic refining of copper, which one of the following is used as anode?

Pure copper Impure copper Carbon rod Platinum electrode

Question 4 Of 10

Match items in Column I – with the items of Column – II and assign the correct code.

Question 5 Of 10

Which of the following plot gives Ellingham diagram

ΔS VsT ΔG° VsT ΔG° Vs1/T ΔG° VsT²

Question 6 Of 10

Bauxite has the composition

Al2O3 Al2O3.nH2O Fe2O3.2H2O None of these

Question 7 Of 10

Which of the following is not true with respect to the Ellingham diagram?

Free energy changes follow a straight line. The deviation occurs when there is a phase change. The graph for the formation of CO2is a straight line almost parallel to the free energy axis. Negative slope of CO shows that it becomes more stable with an increase in temperature. Positive slope of metal oxides shows that their stabilities decrease with an increase in temperature.

Question 8 Of 10

Which one of the following ores is best concentrated by froth floatation method?

Magnetite Heamatite Galena Cassiterite

Question 9 Of 10

In the Ellingham diagram, for the formation of carbon monoxide

(left(frac{Delta mathrm{G}^{0}}{Delta mathrm{T}} ight)) is negative

Question 10 Of 10

Flux is a substance which is used to convert

Mineral’into silicate Infusible impurities to soluble impurities Soluble impurities to infusible impurities All of these

Tamil Nadu State Board ( Samacheer Kalvi ) Online Test based on Book Back Questions - 12th Standard Chemistry - English Medium - Metallurgy

Samacheer Kalvi 12th Chemistry - Metallurgy - Book Back Questions in English Medium