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__________ makes the polymers impermeable to x-rays.

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__________ makes the polymers impermeable to x-rays.

(a) Strontium salts

(b) Ammonium salts

(c) Calcium salts

(d) Barium salts

I had been asked this question in an internship interview.

My enquiry is from Compounding of Plastics in chapter High Polymers and Plastics of Applied Chemistry

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Right answer is (d) Barium salts

For explanation I would say: The barium salts makes the polymers impermeable to x-rays and asbestos provides heat and corrosion resistance to polymers.

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