Which of the following reactions is reversible [MADT Bihar 1980]

1.	Which of the following reactions is reversible [MADT Bihar 1980]
A.	\[{{H}_{2}}+{{I}_{2}}\xrightarrow{{}}2HI\]
B.	\[{{H}_{2}}S{{O}_{4}}+Ba{{(OH)}_{2}}\xrightarrow{{}}BaS{{O}_{4}}+2{{H}_{2}}O\]
C.	\[NaCl+AgN{{O}_{3}}\xrightarrow{{}}NaN{{O}_{3}}+AgCl\]
D.	\[Fe+S\xrightarrow{{}}FeS\]
Answer» B. \[{{H}_{2}}S{{O}_{4}}+Ba{{(OH)}_{2}}\xrightarrow{{}}BaS{{O}_{4}}+2{{H}_{2}}O\]

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