Answer:
<u>Rain Water:</u> Acidic
<u>Cola:</u> Acidic
<u>Tomato Juice:</u> Acidic
<u>Liquid Drain Cleaner:</u> Basic
Answer:
2 K + 1 CrBr2 yield 2 KBr + 1 Cr
Explanation:
Answer : The standard cell potential of the reaction is, -1.46 V
Explanation :
The given balanced cell reaction is,

Here, chromium (Cr) undergoes oxidation by loss of electrons and act as an anode. Lead (Pb) undergoes reduction by gain of electrons and thus act as cathode.
The standard values of cell potentials are:
Standard reduction potential of lead ![E^0_{[Pb^{2+}/Pb]}=-0.13V](https://tex.z-dn.net/?f=E%5E0_%7B%5BPb%5E%7B2%2B%7D%2FPb%5D%7D%3D-0.13V)
Standard reduction potential of chromium ![E^0_{[Cr^{3+}/Cr]}=1.33V](https://tex.z-dn.net/?f=E%5E0_%7B%5BCr%5E%7B3%2B%7D%2FCr%5D%7D%3D1.33V)
Now we have to calculate the standard cell potential for the following reaction.

![E^0=E^0_{[Pb^{2+}/Pb]}-E^0_{[Cr^{3+}/Cr]}](https://tex.z-dn.net/?f=E%5E0%3DE%5E0_%7B%5BPb%5E%7B2%2B%7D%2FPb%5D%7D-E%5E0_%7B%5BCr%5E%7B3%2B%7D%2FCr%5D%7D)

Therefore, the standard cell potential of the reaction is, -1.46 V
Answer:
b it increases from left to right of the group and it decreases down the period.