23) Which solution is used to test for porosity of cadmium and zinc coating?

Answer is:

1% volume of hydrochloric acid solution

Silver Plating MCQ with Answers

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24) Which is the reason tin cans are used to store the food than Iron?

Answer is:

Tin less reactive than iron

25) Which electrolyte is used for tin plating?

Answer is:

Acid sulphate

Explanation:

More than 95% of tin or tin-lead plating is done from acidic electrolytes, while other alloys with copper, zinc, etc are done from alkaline and cyanide electrolytes. For pure tin deposition, sulphuric acid based baths are the most common ones due to its low cost.
Acid sulphate is used as electrolyte for tin plating.