Chemical Process
Function of sodium thiosulphate (hypo) in development of photographic film/plate is to

Convert silver chloride to silver
Remove unexposed silver halide
Remove metallic silver
Brighten the faint images

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Chemical Process
Unsaturated oils compared to saturated oils have

Higher melting point & higher reactivity to oxygen
Lower melting point & lower reactivity to oxygen
Lower melting point & higher reactivity to oxygen
Higher melting point & lower reactivity to oxygen

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