SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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R forms a negative ion
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R ions gain electrons at the cathode
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R ions donate electrons at the cathode
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R is above hydrogen in the electrochemical series
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Detailed explanation-1: -the metal is produced at the cathode if it is less reactive than hydrogen. hydrogen is produced at the cathode if the metal is more reactive than hydrogen.
Detailed explanation-2: -A solid deposit of element R is formed at the cathode when an aqueous solution containing ions of R is electrolysed.
Detailed explanation-3: -Electrolysis of aqueous solutions is a process in which an electrical current is passed through an aqueous (water-based) solution to cause chemical reactions. This process splits the ions in the solution into individual atoms, allowing them to gain or lose electrons.
Detailed explanation-4: -If an aqueous solution of NaCl is electrolysed, the product obtained at the cathode is H2 gas and not Na .