Question

how many OH- required to the following reactions in basic medium SO2 -> SO4 -2 ?
a) 4OH-
b) 2OH-
c) zero OH-
d)6OH-​

Answer 1

2OH-

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Answer 2

The correct option is b.

• The chemical name of $SO_2$ is sulfur dioxide.
• 1 mole of sulfur dioxide reacts with 2 moles of water to form 1 mole of sulfuric acid along with 1 mole of hydrogen gas.
• The reaction is-
• $SO_2+2H_2O\rightarrow H_2SO_4+H_2$
• Thus sulfuric acid exits as $SO_4^{2-}$ ion and water exits as hydroxyl ion. So, during this reaction 2 moles of hydroxyl ion is required.