Protected: WBCHSE Class 11 Chemistry Semester 2 Model Question Paper
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Crystallization of Impure Sample of Benzoic acid
প্র্যাকটিক্যাল: বেঞ্জোয়িক অ্যাসিডের পুনঃকেলাসন (Recrystallization of Benzoic Acid) নীতি (Principle): পুনঃকেলাসনএকটি বহুল ব্যবহৃত পরিশোধন পদ্ধতি, যেখানে কোনো কঠিন অশুদ্ধ রাসায়নিককে গরম দ্রাবকে দ্রবীভূত করে, অদ্রাব্য অশুদ্ধি দূর করে এবং ঠান্ডা করে বিশুদ্ধ স্ফটিক সংগ্রহ করা হয়। এই পরীক্ষায় আমি অশুদ্ধ বেঞ্জোয়িক অ্যাসিডকে গরম জলে দ্রবীভূত করেছি এবং ধীরে ধীরে ঠান্ডা করে এর সুন্দর সাদা সূচাকৃতির
Crystallization of Impure Sample of Common Alum
প্র্যাকটিক্যাল: অশুদ্ধ সাধারণ ফিটকিরি (Alum) – এর পুনঃকেলাসন (Recrystallization of Common Alum) Aim (উদ্দেশ্য): এই পরীক্ষায় আমি অশুদ্ধ নমুনা থেকে সাধারণ ফিটকিরি (KAl(SO₄)₂·12H₂O) পুনঃস্ফুটন পদ্ধতিতে বিশুদ্ধ স্ফটিক হিসেবে সংগ্রহ করেছি। Theory (তত্ত্ব): সাধারণ ফিটকিরি পানিতে বেশ দ্রবণীয়, বিশেষত গরম পানিতে আরও বেশি দ্রবণীয়। ঠান্ডা হলে দ্রবণীয়তা কমে যায়। তাই— স্ফটিকীকরণে প্রধান ধাপ হলো— Requirements (যন্ত্রপাতি):
WB SLST IX-X Physical Science Cut Off Mark: wbssc exam 2025
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