Chemical Process
Pick out the endothermic reaction out of the following.

CO + 3H₂ = CH₄ + H₂O
CaCO₃ = CaO + CO₂
C+1/2O₂ = CO
CO +1/2O₂ = CO₂

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Chemical Process
Fluorescent dyes are added in detergents to

Attain distinctiveness from other brands
Act as tarnish inhibitor for metals like German silver
None of these
Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics

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