=== ফ্রন্ট ম্যাটার ফিল্ডগুলি ===
শিরোনাম: পরিবেশ বিজ্ঞান প্রশ্ন 32
=== মূল অংশ ===
A) $ K _2CO _3,Sio _2,CaCO _3 $
B) $ K _2CO _3,SiO _2,PbCO _3 $
C) $ Na _2CO _3,SiO _2,CaCO _3 $
D) $ Na _2CO _3,SiO _2,PbO $
সঠিক উত্তর: C
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BETA
