Ramakrishnan C.

Ans

A salt bridge is a u-shaped tube plugged at each end with cotton wool that contains an aqueous solution of an ionic salt. The salt bridge can even contain a gel material containing the ionic salt solution. We don't want the solutions to openly mix. A standard bridge is a pathway for cars or pedestrians over something like a body of water or a road. A salt bridge is a pathway for ions to flow between the beakers

Answer:
       Oxidation is a process in which an atom taking part in chemical reaction loses one or more electrons. Te loss of electrons results in the increase of positive charge ( or ) decrease of negative of the species.
Example :

               Mg         →   Mg²⁺   +   2e^-   ( increase of positive charge )

               Fe²⁺       →  Fe³⁺    +   e^-       ( increase of positive charge ) 

                Cu        →  Cu²⁺    +   2e^-   ( increase of positive charge ) 

              S^2-          →    S      +     2e^-     ( decrease of negative charge )

               MnO₄^2-  →   MnO₄^-   +  e^-    ( decrease of negative charge ) 

• Loss of electrons during the reactions are called reducing agents or reductants. In the above equation Mg  , Fe²⁺  ,  Cu are reducing agents.  
• Some important oxidizing agents are,  O₂ , O₃ , H₂O₂ , Cl₂ , HNO₃ , KMnO₄ ,  etc.

Hope now confident on Q&A

Hi Rakesh,

Planck's constant, symbolized h, relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation. In the International System of units (SI), the constant is equal to approximately 6.626176 x 10^-34 joule-seconds.