First we have to understand what a half life is. A half life is a measure of time when the amount of a certain object is 50% of the original amount. Hence the answer for this is letter A. The initial amount is 100. fifty percent of 100 is 50 and that happens after 15 hours. Hence, 15 hours is the half life period.
Because of the characteristic of catalyst. The catalyst is used to accelerate the reaction rate and will not participate the reaction itself. The catalyst can not be changed or consumed during the reaction. So it does not need to be replaced.
6.<span>Pure </span>ethanol<span> will irritate the skin and eyes and can cause some sort of poisoning to the body</span>
7.Because Methanol<span> has to first be turned into formaldehyde in the body. Humans have an enzyme called alcohol dehydrogenase, which oxidizes alcohol compounds (adds an oxygen, effectively.) If you drink a beer, the </span>ethanol<span> is converted to acetaldehyde which is a slightly </span>toxic<span> intermediate.
8.</span><span>Like </span>methanol<span>, </span>ethanol<span> is metabolized by ADH, but the enzyme's affinity for </span>ethanol<span>is 10-20 times higher than it is for </span>methanol<span>. Fomepizole is also metabolized by ADH; however, its use is limited because of high cost and lack of availability. Hemodialysis can easily remove </span>methanol<span> and formic acid.
9. CALL POISON CONTROL IMMEDIATLEY </span>
Answer : The value of 
for the reaction is, 
Explanation :
The given equilibrium reactions are:
(1) 
(2) 
As we know that, when we are multiplying the equation (1) by 2 then we get the equation (2). Thus, the relation between the two equilibrium constant will be,
So,
Therefore, the value of for the reaction is,
