All Students Notes

1. The electrode through which the electron enter the electrolytic solution is a) Anode b) Cathode c) Salt bridge d) Electrolyte ... Answer is b) Explanation: The elctrode at which electron enter electrolytic solution is called cathod. At cathode, cations from electrolytic solution, take up elctron and get reduced. show Answer 42. Oxidation number of S in Na 2 S 2 O 3 a) +1 b) +2 c) +3 d) +4 ... Answer is b) Explanation: Suppose, oxidation state of S in Na 2 S 2 O 3 is X. Sum of oxidation numbers of all atoms present in a neutral compound is zero. 2(Oxidation No. of Na) + 2(Oxidation No. of S) + 3(Oxidation No. of O ) = 0 2(+1) + 2 (x) + 3(-2) = 0 +2 + 2x -6 = 0 +2x -4 = 0 +2x = 4 x = 4/2 = +2 show Answer 3. In the electrolysis of molten ZnCl 2 , the cathode reaction is Zn +2 +2e - ---------> Zn. What quantity of electricity is used up for the production of half mole of Zn a) 2 C...