Electrometallurgy And Corrosion — Part 1 MCQs with Explanations

increasing the carbon content is the correct answer to “Intergrannular corrosion of light 18-8 stainless steel can not be prevented by”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Platinum is the correct answer to “Which of the following metals is highest noble in the Galvanic series”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Pitting is the correct answer to “Difficult to monitor and very dangerous form of corrosion”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Pt, Cu, Fe, Zn is the correct answer to “Based on the standard galvanic series, select the correct sequence of metals in the increasing order of anodic behaviour:”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Chemical reactions is the correct answer to “Corrosion of metals involves”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

P-3, Q-2, R-4, S-1 is the correct answer to “Match the form of corrosion in Group 1 with the typical examples in Group 2 . Group 1 Group 2 P. Filiform corrosion 1. Austenitic stainless steel in chloride environment Q. Crevice corrosion 2. Nut bolt with gasket R. Galvanic corrosion 3. Painted food cans S. Stress corrosion cracking 4. Steel studs in copper plate”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

1.23 is the correct answer to “The difference in reversible potential between oxygen reduction reaction and hydrogen evolution reaction of any pH in an aqueous electrolyte is . . . . . . . . volt. [Given, standard reduction potentials for hydrogen evolution reaction, $$\frac{{{E^ \circ }2{H^ + }}}{{{H_2}}} = OV,SHE$$ and oxygen reduction reaction : $$\frac{{{E^ \circ }{O_2}}}{{4OH}} = 0.4V,SHE.$$ Also PH 2 = PO 2 = 1 atm]”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

is zero (possivation) is the correct answer to “Zinc rod is immersed in dilute HCl (pure). If a very small amount of FeCl 3 is added to the solution, the corrosion rate of zinc”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Al is the correct answer to “Which of these metals can not be electroplated from aqueous electrolyte”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

$$ - \frac{{RT}}{{4F}}In\frac{{PO_2^{\left( 2 \right)}}}{{PO_2^{\left( 1 \right)}}}$$ is the correct answer to “The oxygen activity in a liquid metal can be-measured by a concentration cell using stabilised zirconia electrolyte PO 2 (1) | ZrO 2 based solid electrolyte | PO 2 (2) Where, PO 2 (1) is the reference oxygen pressure and PO 2 (2) is the oxygen pressure in equilibrium with liquid metal. If, F is Faraday constant, the EMF of the cell is equal to”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

positive is the correct answer to “A metal is electrochemically polarised to a potential which is higher than the standard reduction potential of the metal. The overvoltage will be”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

ΔE° increases exponentially with increase in concentration of the ions is the correct answer to “The difference in potential between two standard half cells is ΔE°. If the half cell are galvanically coupled, the value of ΔE°, with changes in concentration of ions in the solution, is such that”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

30 is the correct answer to “In electrolytic refining of nickel (Ni), the anode is Cu-10 atom% Ni and the cathode is pure Ni. Assuming the Cu-Ni solution to be ideal, the absolute value of the minimum voltage (in mv) required for refining is. Given, Faraday's constant = 96490 C mole -1 , Temperature = 300 K, R = 8.314 J. mol -1 . K -1”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Pb2+/Pb: - 0.126 is the correct answer to “Which of the following metals is lowest active in the electrochemical series”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Nickel is the correct answer to “Which of the following metals is lowest noble in the Galvanic series”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

P-4, Q-1, R-2, S-3 is the correct answer to “Match the following: P. Dezincification 1. Reactivation Q. Flade potential 2. Stainless steel R. Intergranular corrosion 3. Polarisation S. Tafel relationship 4. Brasses”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

All are correct is the correct answer to “When P-B ratio is less than 1”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

P, Q and S is the correct answer to “Identify the correct combination of the following statements. P. Hydrogen electrode is a standard used to measure redox potentials. Q. Activation polarization refers to electrochemical process controlled by reaction sequence at metal-solution interface. R. Potential-pH diagrams can be used to predict corrosion rates of metals. S. Cathodic protection can use sacrificial anodes such as magnesium.”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

A conjoint action involving corrosion and cyclic loading is the correct answer to “Corrosion fatigue”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Fe2O3.XH2O is the correct answer to “Chemical formula of Rust is,”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

All are correct is the correct answer to “The elements get oxidised with logarithmic law”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Adsorption and phase layers is the correct answer to “Which of the following phenomenon that occurs on metal surface during inhibition”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

P-3, Q-1, R-4, S-2 is the correct answer to “Match the following: P. Cathodic protection 1. Decarburisation Q. Hydrogen attack 2. Erosion R. Pilling Bedworth ratio 3. Galvanising S. Cavitation 4. Oxidation of metals”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

P-1, Q-2, R-3, S-4 is the correct answer to “Match the corrosion phenomenon with the material in which they are commonly observed. P. Season cracking 1. 70 : 30 brass Q. Pitting corrosion 2. GI water line fitted with a brass tap R. Galvanic corrosion 3. Duralumin S. Caustic embrittlernent 4. Boiler steel”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

galvanic corrosion is the correct answer to “When two metals or alloys are electrically coupled while exposed to an electrolyte is called”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

It has very high vapor pressure, inhibit atmosphere corrosion without being contact with the metal surface and very effective in closed spaces is the correct answer to “Which is/are the characteristics of the vapor phase inhibitor”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Both A and B is the correct answer to “Uniform corrosion”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Sacrificial anode is the correct answer to “Which protection method is depicted in then given figure”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

$$\frac{{{m_1}}}{{{m_2}}} = \frac{{{E_1}}}{{{E_2}}}$$ is the correct answer to “The mathematical expression of Faraday's II Law of Electrolysis”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Q, S is the correct answer to “From the list given below: P. Cu Q. Mg R. Ni S. Zn Two metals which provide cathode protection to steel are:”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

All are correct is the correct answer to “Which metals shows P-B ratio greater than 2”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

both A and B is the correct answer to “Physical barriers to corrosion may be applied in the form of coating and films when”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Co is the correct answer to “When Pt and Co are electrically connected, which one gets corroded”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

P-3, Q-4, R-1, S-2 is the correct answer to “Match the principle given in Group I with corresponding corrosion terminology in Group II . Group I Group II P. Electrode polarization 1. Dezincification Q. Passivity 2. Intergranular attack R. Selective leaching 3. Over voltage S. Grain boundary precipitation 4. Surface oxide film”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Sandblasting, chipping, wire brushing and flame cleaning is the correct answer to “Which of the following is/are the methods for surface preparation for coating application”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

titanium is the correct answer to “Which metals/alloys passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

equivalent mass of the electrolyte is the correct answer to “The Faraday's laws of electrolysis are related to the”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

negative charge is the correct answer to “The cathode in an electrochemical cell always carries”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

108 is the correct answer to “Two electrolytic cells with CuSO 4 and AgNO 3 solutions are connected in series to a power source. If after 10 minutes the weight of copper (atomic weight 63.5) deposited in the first cell is 63.5 gms, the corrosponding weight of silver (atomic weight 108) deposited in the second cell is . . . . . . . . gms.”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.

Both A and B is the correct answer to “Logarithmic rate law”. This question is standard in competitive examination syllabi for Electrometallurgy And Corrosion.