What will be the value of $pH$ if blue litmus paper turns red in an aqueous solution?

  • A
    $7$
  • B
    $14$
  • C
    Between $7$ to $14$
  • D
    Between $0$ to $7$

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Which of the following are present in a dilute aqueous solution of hydrochloric acid?

$(i)$ Name the products formed when sodium hydrogen carbonate is heated.
$(ii)$ Write the chemical equation for the reaction involved in the above.

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$(a)$ Sulphuric acid
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