Olympiad – Class VII – Science - Che - Acids, Bases and Salts

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Question - 1

Identify the acid present in tamarind

  • A Tannic acid
  • B Lactic acid
  • C Tartaric acid
  • D Citric acid

Question - 2

Which acid is present in vinegar

  • A Formic acid
  • B Acetic acid
  • C Citric acid
  • D Malic acid

Question - 3

In which of the following is ascorbic acid present?

  • A Tea and coffee
  • B Milk
  • C Ants
  • D Fruits and vegetables

Question - 4

From which of the following is the natural indicator litmus extracted?

  • A Mycorrhiza
  • B Lichens
  • C Mucor
  • D Mycelia

Question - 5

What is injected into the skin when an ant bites

  • A Acid
  • B Base
  • C Salt
  • D Water

Question - 6

Which of the following chemicals are used to neutralise the basic nature of soil

  • A Quick lime
  • B Organic matter
  • C Slaked lime
  • D Baking soda

Question - 7

Which of the following is an antacid

  • A Mg(OH)2
  • B NaOH
  • C H2S04
  • D H20

Question - 8

Identify the two kinds of litmus paper

  • A Blue and red
  • B Blue and yellow
  • C Red and green
  • D Yellow and red

Question - 9

Which of the following statements is correct

  • A Acids turn blue litmus red
  • B Bases turn red litmus blue
  • C Water changes the colour of a litmus.
  • D Both (A) and (B)

Question - 10

How does methyl orange indicator change its colour in the presence of acids

  • A Yellow
  • B Green
  • C Red
  • D White