CORROSION

Which of the following methods is not used for the prevention of corrosion?

• Greasing

• Painting

• Plating

• heating

Corrosion can be prevented by

• alloying

• tinning

• galvanising

• all of the above.

Galvanic cells are also named as

• electrolytic cell

• daniel cell

• battery cell

• john cell

Voltaic cells generate electricity by

• spontaneous redox reaction

• non spontaneous redox reaction

• sublimation reaction

• thermochemical reaction

Rusting of iron could take place in

• distilled water

• ordinary water

• distilled water and ordinary water

• none of the above.

The process of deterioration of a metal due to unwanted chemical or electrochemical interaction of the metal with its environment is called ___________

• Electrolysis

• Corrosion

• Electrodialysis

• Deposition

Which of the following is the most stable state of metal?

• Ore of metal

• Pure metal

• Corroded metal

• Metal ion

Due to corrosion, useful properties of metals such as malleability, ductility and electrical conductivity are lost.

• True

• False

Select the incorrect statement from the following option.

• Replacement of corroded equipment is time-consuming

• Corrosion causes contamination of product

• Corrosion increases the electrical conductivity of metals

• Corrosion causes leakage of toxic liquid or gases

During galvanization, the function of flux ammonium chloride is

• To prevent oxide formation, on molten zinc

• To prevent reduction of molten zinc

• To acts as a barrier

• None of these