<span>a regulate is to control or direct by a rule, principle, or method.</span>
I think B, don’t come at me if I’m wrong
Answer:
9.4 metric ton of SO₂ are emitted from yhe smoke stack each year.
Explanation:
Total amount = 100 metric ton
Sulphur in the total amount = 5% = 5 metric ton
Ash = 3% = 3 metric ton
Sulphur in the ash = 10% of 3 metric ton = 0.3 metric ton
Sulphur in the flue gases = 5 metric ton - 0.3 metric ton = 4.7 metric ton
Combustion of sulphur: S (s) + O₂ (g) → SO₂ (g)
32 g S _________ 64 g SO₂
4.7 x 10⁶ g ______ x
x = 9.4 x 10⁶ g = 9.4 metric ton of SO₂
Answer: The correct option would be A.
Explanation: The main group elements which make more bonds than that was predicted from the octet rule are supposed to have expanded octet.
These elements tend to have more than 8 valence electrons after bonding and this can be achieved when we have empty d-orbitals.
When we have empty p-orbitals, total number of valence electrons than can be occupied will be 8.
Electronic configuration when valence shell's empty p-orbitals are fully filled = 
which means that a total of 8 electrons can be occupied which does not satisfy expanded octet rule.
Example of molecule showing expanded octet rule is given in the image. Here, after bonding Phosphorous has 10 electrons which is occupied in empty d-orbitals.
<span>situated or extending across something.</span>