Question

H₂SO₄和H₂S中S元素化合價的代數和是

1. A.
   2
2. B.
   4
3. C.
   6
4. D.
   8

Answer 1

B
設硫化氫中硫的化合價為x．（+1）×2+x=0,解得x=-2,;設硫酸中硫的化合價為w．（+1）×2+w+（-2）×4=0解得w="+6," S元素化合價的代數和=-2+6=+4，故選B