Which of the following is incorrect regarding salt P bridge solution? W (1) Solution must be a ...

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Which of the following is incorrect regarding salt
P bridge solution?

W
(1) Solution must be a strong electrolyte
(2) Solution should be inert towards both electrodes
(3) Size of cations and anions of salt should be much different
(4) Salt bridge solution is prepared in gelatin or agar-agar to make it semi-solid
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