railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry States of Matter

FeSO ₄ গরম করার সময় প্রাপ্ত গ্যাসগুলি হল-

1

SO₂ এবং SO₃উভয়ই

2

H₂S

3

SO₂

4

SO₃

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