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Yes. Some people cannot tolerate corn, so tapioca starch is a good substitute.
Tapioca starch has similar properties to corn starch. The amylose content of tapioca starch is about the same as corn starch but there are some phosphate groups present in tapioca which I think affect the solubility of starches in water.
No...
Corn starch is a souluble starch.
No, tapioca is starch extracted from the root of a Brazilian plant called Manihot esculenta.
Corn Starch
Baking soda is not at all similar to tapioca starch, so you would get a very different result if you replaced one with the other. A more logical substitution for tapioca starch would be corn starch.
bio-plastic is made from starch like corn starch, TAPIOCA starch,& etc starch + oil + water → bio-plastic ↑ cooked
You can use 4 teaspoons of quick cooking tapioca OR 1 tablespoon corn starch in place of 2 tablespoons flour for thickening.
Flour and corn starch are measured the same, but the results aren't always the same.
Sweetcorn
Cornstarch or Corn flour (for thickening): 1 tablespoon = 2 tablespoons all purpose flour or1 tablespoon potato starch or rice starch or flour 1 tablespoon arrowroot 2 tablespoons quick-cooking (instant) tapioca For other uses such as the main flour it's rather tricky I think it's best to only substitute Corn flour if it's for thickening.