A 2H2+O2→2H2O;ΔΗ=-571.70 KJmol-1
B 2H2(g)+O2(g)→2H2O(g);ΔΗ=-483.67 KJmol-1
C উপরের সবগুলো
D উপরের কোনটিই না
Correct Answer: Option B
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