Answer: Because Alkalis are bases that can dissolve in water, which can also neutralize acid.
As you go down group 7 the melting point of the elements will increase, this is because as you go down the group you are gaining an electron shell and the molecule will become bigger. This increase in size means that there will be an increase in the intermolecular forces as well.
So the order would be NF3, NBr3, NI3.
Hopefully this helps!
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2H2+O2→2H2O
We have to be aware that the number of atoms are the same on both reactant side and product side.
I think the answer is solvent but i'm not very sure.
