MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
RAJ RANJAN SINGH Grade: 11
        

wht is oxidation no. ??? how to find it ???? is algebraic method applicable in complex molecules    apart frm ur dtailed ans if u hav any link for REDOX REACTN plzzz send.......

6 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear raj,


Electrochemical reactions involve the transfer of electrons. Mass and charge are conserved when balancing these reactions, but you need to know which atoms are oxidized and which atoms are reduced during the reaction. Oxidation numbers are used to keep track of how many electrons are lost or gained by each atom. These oxidation numbers are assigned using the following rules:



  1. The convention is that the cation is written first in a formula, followed by the anion.

    For example, in NaH, the H is H-; in HCl, the H is H+.


     



  2. The oxidation number of a free element is always 0.

    The atoms in He and N2, for example, have oxidation numbers of 0.


     



  3. The oxidation number of a monatomic ion equals the charge of the ion.

    For example, the oxidation number of Na+ is +1; the oxidation number of N3- is -3.


     



  4. The usual oxidation number of hydrogen is +1.

    The oxidation number of hydrogen is -1 in compounds containing elements that are less electronegative than hydrogen, as in CaH2.


     



  5. The oxidation number of oxygen in compounds is usually -2.

    Exceptions include OF2, since F is more electronegative than O, and BaO2, due to the structure of the peroxide ion, which is [O-O]2-.


     



  6. The oxidation number of a Group IA Element in a compound is +1.

     



  7. The oxidation number of a Group IIA Element in a compound is +2.

     



  8. The oxidation number of a Group V11A Element in a compound is -1, except when that element is combined with one having a higher electronegativity.

    The oxidation number of Cl is -1 in HCl, but the oxidation number of Cl is +1 in HOCl.


     



  9. The sum of the oxidation numbers of all of the atoms in a neutral compound is 0.

     



  10. The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

    For example, the sum of the oxidation numbers for SO42- is -2.












Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.


All the best.


Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.


Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..


 


Askiitians Expert


Sagar Singh


B.Tech, IIT Delhi










6 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details
Get extra Rs. 3,180 off
USE CODE: CART20
Get extra Rs. 551 off
USE CODE: CART20

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details