Discussion
................. is the most abundant component of seawater, which has maximum residence time.
Answer: C
The answer is chloride.
Chloride is the most abundant dissolved constituent of seawater, about 55 percent by weight of the dissolved salts (about 19 g per kg of seawater). It is also highly unreactive: it is not taken up by organisms or removed into sediments to any great extent, so it stays in the ocean for a very long time, of the order of 100 million years.
Sodium is the second most abundant ion and has a somewhat shorter residence time. Lithium and aluminium are trace elements; aluminium in particular is removed very quickly onto particles.
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