Blue litmus turns red in the following mixture of acid and base:

  • A
    $100 \ mL$ of $1 \times 10^{-2} \ M \ H_2SO_4 + 100 \ mL$ of $1 \times 10^{-2} \ M \ Ca(OH)_2$
  • B
    $100 \ mL$ of $1 \times 10^{-2} \ M \ HCl + 100 \ mL$ of $1 \times 10^{-2} \ M \ Ba(OH)_2$
  • C
    $100 \ mL$ of $1 \times 10^{-2} \ M \ H_2SO_4 + 100 \ mL$ of $1 \times 10^{-2} \ M \ NaOH$
  • D
    $100 \ mL$ of $1 \times 10^{-2} \ M \ HCl + 100 \ mL$ of $1 \times 10^{-2} \ M \ NaOH$

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