Which of the following substances is the most powerful oxidizing agent? br2 ci2 cr3+ sn2+

CI2

Explanation:

An oxidising agent is one which oxidises other elements and gets reduced in the process. In other words, it has a greater tendency to accept electrons.

The oxidising ability of an element can be estimated based on its standard reduction potential (E⁰). More positive the reduction potential of an element, greater will be its ability to accept electrons are behave as a powerful oxidising agent.

In the given examples, the E⁰ for Cl2 is the most positive at 1.36 V i.e.

Cl2 + 2e- → 2Cl-          E⁰ = +1.36 V

Hence, Cl2 will be most powerful oxidising agent

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.