Question

The colour of hydrogen is:
A. Yellow
B. Orange
C. Red
D. None

Answer 1

Hint: To answer this question, we should know that when we react metal with strong acid there is a formation of metal product off course but there is also formation of invisible gas which we test by pop sound.

Step by step answer:
We should first know about hydrogen. It is an odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements. As we know that hydrogen is the first member of the periodic table, so an atom has a nucleus consisting of a proton bearing one unit of positive electrical charge; an electron, bearing one unit of negative electrical charge, is also associated with this nucleus. We should know this interesting fact about hydrogen. It is the most abundant element in the universe (three times as abundant as helium, the next most widely occurring element), it makes up only about 0.14 percent of Earth’s crust by weight.
We should know that hydrogen is transparent to visible light, to infrared light, and to ultraviolet light to wavelengths below 1800 Å. So, from this we can say that hydrogen doesn’t have any colour. So, we can say that option D is the correct answer to this question.

Note: We will now know about the reason for colour in elements. Generally transitional metal ions possess different colours. We should know that transitional metal ions generally possess one or more unpaired electrons. When visible light falls on a transition metal compound or ion, the unpaired electrons present in the lower energy d-orbital get promoted to high energy d-orbitals, called d-d transition, due to the absorption of visible light. And then emit a wavelength of particular colour.