The cation will precipitate after the step. Then the cation will precipitate after the step. a. fourth
b. first
c. second
d. third
e. Al^3+
f. Sn^4+

f. Sn^4+

c. second

e. Al^3+

d. third

Explanation:

This question comes from a quantitative analysis showing the flowchart of a common scheme for identifying cations.

Now, from the separation scheme, Let's assume that Sn⁴⁺ & Al³⁺ were given; Then, Yes, the separation will work.

However, there will be occurrence of precipitation after the 1st step1.

So,  the Sn⁴⁺ cation will precipitate after the second step. Then the Al³⁺ cation will precipitate after the third step.

i have no clue hope you find the answer

4d^55s^1 ( third choice)