Question

In the poling method used to purify a metal, the molten metal is stirred with the logs of green wood. This is because the logs of green wood ______.

Options

• stir the molten metal thoroughly.

• absorb the impurities present in the crude metal.

• release hydrogen which reduces the impurities present in the crude metal.

• release hydrocarbon gases which reduce the impurities present in the crude metal.

Answer 1

In the poling method used to purify a metal, the molten metal is stirred with the logs of green wood. This is because the logs of green wood release hydrocarbon gases which reduce the impurities present in the crude metal.

Explanation:

In the poling method, molten metal (like copper or tin) is stirred with logs of green wood. The green wood releases hydrocarbon gases (such as CH₄, CO, and H₂) when heated, which act as reducing agents. These gases reduce any metal oxides present in the molten metal back to the pure metal, thereby removing oxide impurities.