Question

The reactions which are caused by heat and in absence of light is called _____

(a) Photochemical reactions

(b) Dark reactions

(c) Reversible reaction

(d) Reversible photochemical reaction

I have been asked this question by my college professor while I was bunking the class.

The query is from Photochemical Reactions topic in portion Photochemistry of Engineering Chemistry I

Answer 1

Correct option is (b) Dark reactions

To elaborate: The reactions which are caused by heat and in absence of light are called thermal or dark reactions. A reaction that takes place by absorption of light radiations of a specific wavelength is called photochemical reaction.