Energy efficiency during electroplating is usually in the range:

50 to 70 %.

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80 to 85 %.

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85 to 90 %.

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90 to 99 %.

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Solution

The correct option is A 50 to 70 %.
The energy efficiency is usually very less in the range of $50$ to $70$ % because, in the electroplating process, other side reactions occur which eventually reduces the overall system's energy efficiency.

Hence, option A is correct.

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