Which one of the following looks odd__________________?
Correct answer: C. H2S
- A. H2SO4
- B. KMnO4
- C. H2S
- D. K2CrO4
Explanation
H2SO4, KMnO4 and K2CrO4 all contain oxygen and are oxy compounds or oxy salts, whereas H2S is a binary hydride containing no oxygen. Thus H2S is the odd member of the group. A student may select H2SO4 because it is an acid, but H2S is also an acid in water, so the more useful distinction is its lack of oxygen.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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