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Hydrogen ion concentration of an aqueous solution is $1 \times {10^{ - 4}}\,M$. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of $mol$ $d{m^{ - 3}}$ is

• A
  $1 \times {10^{ - 8}}$
• B
  $1 \times {10^{ - 6}}$
• ✓
  $2 \times {10^{ - 10}}$
• D
  $0.5 \times {10^{ - 10}}$