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Which are the gasses that get precipitated in the form of bubbles when the battery is overcharged?

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in Automotive Engine Design by (137k points)
Which are the gasses that get precipitated in the form of bubbles when the battery is overcharged?

(a) Hydrogen and helium

(b) Nitrogen and hydrogen

(c) Hydrogen and oxygen

(d) Nitrogen and oxygen

I have been asked this question in a national level competition.

Question is taken from Battery Charging topic in section Storage Batteries of Automotive Engine Design

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Correct option is (c) Hydrogen and oxygen

For explanation I would say: The major factor affecting the charging is gassing wherein excessive hydrogen and oxygen bubbles due to overcharging may wash away active material on the plates, decreasing the charging rate. Due to which overcharging must be avoided.

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