The answer is: C. 3 : 2.
Balanced chemical reaction: 3H₂ + N₂ → 2NH₃.
From chemical reaction: n(H₂) : n(NH₃) = 3 : 2.
Coefficients with the lowest ratio indicate the relative amounts of substances in a reaction.
Coefficient in fron of hydrogen is 3 and coefficient in fron ammonia is 2.
Coefficients are important to prove the law of conservation of mass.
The answer is; The spectrum of a star shifts towards the blue region when the star moves towards Earth.
This is referred to as the Doppler shift effect. As the star moves closer to the observer, the wavelength of light it produces is ‘compressed’ hence changing its relative frequency (just like the pitch of the siren of an ambulance approaching you).
As you have not provided the options, still we can figure out the answer by understanding the key difference between saturated and unsaturated hydrocarbons.
SATURATED HYDROCARBONS are those hydrocarbons which only consist of a carbon carbon single bonds. All the bonds are sigma there are no pi bonds at all. Examples are shown below.
While, UNSATURATED HYDROCARBONS are those hydrocarbons which may contain either a double bond or triple bonds or both of them between the carbon atoms as shown below.
Answer:
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