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What is Plaster of paris? How is it prepared? Give one importance use of it.

Q. What is Plaster of paris? How is it prepared? Give one importance use of it. ‘প্লাষ্টাৰ অব্‌ পেৰিছ’ কি? ইয়াক কেনেকৈ প্ৰস্তুত কৰা হয...