A is a violent cyclonic storm that forms out at sea in the tropics near the . The tropical climate has air which provides the ri
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Answer : (C) Hafnium is the most likely identity of the given substance.
Solution : Given,
Mass of given substance (m) = 46.9 g
Volume of given substance (V) = 3.5
First, find the Density of given substance.
Formula used :
Now,put all the values in this formula, we get
= 13.4 g/
So, we conclude that the density of given substance (13.4 g/) is approximately equal to the density of Mercury and Hafnium (13.53 and 13.31 g/
respectively).
According to the question the substance is solid at room temperature but Mercury is liquid at room temperature. So, Mercury is not identical to the given substance.
Another element i.e, Hafnium is the element whose density is approximately equal to the given substance and also solid at room temperature. And we know that the melting point of solid is high.
So, Hafnium is the most likely element which is the identity of the given substance.
<u>Answer:</u> The spontaneous cell reaction having smallest is
<u>Explanation:</u>
We are given:
The substance having highest positive potential will always get reduced and will undergo reduction reaction. Here, iodine will always undergo reduction reaction, then copper and then iron.
The equation used to calculate electrode potential of the cell is:
The combination of the cell reactions follows:
- <u>Case 1:</u>
Here, iodine is getting reduced and iron is getting oxidized.
The cell equation follows:
Oxidation half reaction:
Reduction half reaction:
Thus, this cell will not give the spontaneous cell reaction with smallest
- <u>Case 2:</u>
Here, iodine is getting reduced and copper is getting oxidized.
The cell equation follows:
Oxidation half reaction:
Reduction half reaction:
Thus, this cell will give the spontaneous cell reaction with smallest
- <u>Case 3:</u>
Here, copper is getting reduced and iron is getting oxidized.
The cell equation follows:
Oxidation half reaction:
Reduction half reaction:
Thus, this cell will not give the spontaneous cell reaction with smallest
Hence, the spontaneous cell reaction having smallest is