Need chemistry with The number of d-electrons in Fe2+ (Z = 26)

1.    The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

2.   

The molecules of which gas have highest speed?

3   

The oldest rocks in the earth’s crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock’s called

4  

The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is

5  The main buffer system of the human blood is

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