Select the correct answer. What is the SI unit of time?
2 answers:
Option A: second
SI units are international system of units. This is defined as a system of units of physical quantities such as mass, length, temperature, current etc. Some of the physical units are gram, meter, second etc. along with the set of prefixes which indicates the multiplication and division with some power of 10.
For same physical quantities, these units are inter convertible For example,
and,
Here, g (gram), kg (kilogram) and mg (milligram) all are units of mass.
The units of time are second, minute, hour, day and year. Here, second is the SI unit and all the units are inter convertible as follows:
1 year=365 days
1 day=24 hours
1 hour=60 minutes
1 minute-60 seconds
Thus, the SI unit of time is second.
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Answer:
Manganese decreases from 4+ to 2+ (reduced and oxidizing agent) and nitrogen increases from 2+ to 5+ (oxidized and reducing agent).
Explanation:
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In this case, according to the given redox reaction, we rewrite it as a convenient first step:
Next, we assign the oxidation numbers as follows:
Thus, we can see that both manganese and nitrogen undergo a change in their oxidation number, the former decreases from 4+ to 2+ (reduced and oxidizing agent) and the latter increases from 2+ to 5+ (oxidized and reducing agent).
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