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

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

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Chemical Process
Nylon 66 is so named because the

Number of nitrogen atoms between two carbon atoms are 6
Number of carbon atoms between two nitrogen atoms are 6
Polymer was first synthesised in 1966
Average degree of polymerisation of the polymer is 1966

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