A common clasiffication of the chemical reactions is as combination (or synthesis), decomposiion, single replacement and double replacement. Knowing the reactants and products you can tell to which one of those four classifications a reaction pertains. When two reactants combine into a single product, it is a combination (syntheisis) reaction. When a single reactant yields two or more products, it is a decomposition reaction. When the cation of a single element, replaces the cation in a compound, it is a single replacement. When the cations of two different reactants exchange and end combined with the anions of the others compounds, it is a double replacement reaction.
Answer:
<h2><em><u>Option a</u></em></h2><h2>
<em><u>Weathering</u></em></h2>
Explanation:
<h3><em>Weathering is a term which describes the general process by which rocks are broken down at the Earth's surface into such things as sediments, clays, soils and substances that are dissolved in water. </em></h3>
<u><em>As weathered products are carried away, fresh rocks are exposed to further </em><em>we</em><em>athering</em><em>.</em></u>
The molarity of the acid is 1.25 M.
<u>Explanation:</u>
We have to find the molarity of HCl by writing the balanced equation that is the neutralization reaction of Hydrochloric acid with the base, Sodium Hydroxide, NaOH.
HCl + NaOH → NaCl + H₂O
From the balanced equation, we can find that one mole of an acid is used to neutralize one mole of a base.
As per the law of volumetric analysis, we can write the equation as,
V1M1 = V2M2
Here V1 and M1 being the volume and molarity of the NaOH
V2 and M2 being the volume and molarity of HCl
V1 = 250 ml
M1 = 0.50 M
V2 = 100 ml
M2 = ?
Now the above equation can be rearranged to find the molarity of the acid as,
M2 = 
= 
= 1.25 M
So the molarity of the acid is 1.25 M.
