Chemical Engineering Basics
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is

Lighter
Oxidised preferentially
Cheaper
Reduced preferentially

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Chemical Engineering Basics
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

Disposing off machine/property, which is no longer useful in the present scenerio
Mortgaging the obsolete machine/property
Writing off the obsolete machine/ property
Disposing off a machine/property on as is where is basis

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