1000+ Last 10 Years TNPSC Question Papers with Answers Pdf - 2

Question: 6

Which of the following transition metal is in liquid state?

(A) Mercury

(B) Chromium

(C) Cadmium

(D) Vanadium

Question: 7

The substance used as an activator in froth floatation process is

(A) Sodium cyanide

(B) Potassium ethyl xanthate

(C) Pine oil

(D) Copper sulphate

Question: 8

Which metal shows more than one oxidation state?

(A) Mg

(B) Fe

(C) Na

(D) Ag

Question: 9

Smoke is an example of

(A) Liquid dispersed in solid

(B) Solid dispersed in gas

(C) Gas dispersed in liquid

(D) Gas dispersed in solid

Question: 10

Which one of the following fuels causes minimum environmental pollution?

(A) Kerosen

(B) Diesel

(C) Coal

(D) Hydrogen