Please help me in this.
i'll seriously mark you
please help.

First box: 3

Second box: 4

Third box: 3

Fourth box: 4

Explanation:

I tried out various numbers, but got 3 and 4 because:

3PbI4 + 4CrCl3 > 3PbCl4 + 4CrI3

Each term cancels put.

3Pb --> 3Pb

4Cr --> 4Cr

and so forth...

Hope this helps!

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.