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Answer is both (b) and (d).
<em>Explanation;</em>
Equilibrium constant is written as a ratio between concentrations of products and reactants.
The equilibrium reaction is
A(g) ⇄ B(g)
Hence, the equilibrium constant can be expressed as
K = [B(g)] / [A(g)]
If there is more B, then A should be less. Hence, K value would be more than 1.
Hence, according to the given choices, K = 4000 and K = 1 x 10⁶ can be taken as correct answers.
I believe the answer is B
<span>After 3200 years, the amount remaining of the original 900 g is 225/900 = 1/4.
Each half-life is enough time to reduce the amount of a radioactive material by a factor of 2.
1/4 is a reduction by two factors of 2. (1/2 * 1/2 = 1/4)
So 3200 years is two half-lives, so one half-life is 1600 years. </span> Source(s):
