Which one of the following can be used as an acid-base indicator by a visually impaired student?

  • A
    Vanilla essence
  • B
    Turmeric
  • C
    Litmus
  • D
    Petunia leaves

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$A$ sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the $pH$ paper yellowish-orange. Which of the following would change the colour of this $pH$ paper to greenish-blue?

Acid and base react with each other and form salt and water. What is this reaction called in scientific language?

Tap water conducts electricity,whereas distilled water does not. Why?

$(i)$ Give an example of a strong base and a weak base.

Which of the following gives the correct increasing order of acidic strength?

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