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

Cheaper
Oxidised preferentially
Lighter
Reduced preferentially

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Chemical Engineering Basics
Compression ratio of an I.C. engine is the ratio of the

Clearance volume to the volume swept by piston per stroke
Volume of air in cylinder before compression to that after compression
Pressure after compression to that before compression
None of these

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