TN State Board Samacheer Kalvi Online Test for 11th Std - Chemistry - English - Metallurgy

Question 1 Of 10

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

Magnetite Heamatite Galena Cassiterite

Question 2 Of 10

Which of the metal is extracted by Hall – Heroult process?

Al Ni Cu Zn

Question 3 Of 10

Which of the following reduction is not thermodynamically feasible?

Cr2O3 + 2Al → Al2O3 + 2Cr Al2O3 + 2Cr → Cr2O3 + 2Al 3TiO2 + 4Al → 2Al2O3 + 3Ti None of these

Question 4 Of 10

Which of the following plot gives Ellingham diagram

ΔS VsT ΔG° VsT ΔG° Vs1/T ΔG° VsT²

Question 5 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 6 Of 10

Bauxite has the composition

Al2O3 Al2O3.nH2O Fe2O3.2H2O None of these

Question 7 Of 10

Which one of the following is not feasible

Zn(S) + Cu2+(aq) → Cu(s) + Zn2+(aq) Cu(S) + Zn2+(aq) → Zn(s) + Cu2+(aq) Cu(S) + 2Ag+(aq) → Ag(s) + Cu2+(aq) Fe(S) + Cu2+(aq) → Cu(s) + Fe2+(aq)

Question 8 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 9 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

Question 10 Of 10

In the extraction of aluminium from alumina by electrolysis, cryolite is added to

Lower the melting point of alumina Remove impurities from alumina Decrease the electrical conductivity Increase the rate of reduction

Tamil Nadu State Board ( Samacheer Kalvi ) Online Test based on Book Back Questions - 11th Standard Chemistry - English Medium - Metallurgy

Samacheer Kalvi 11th Chemistry - Metallurgy - Book Back Questions in English Medium