Acids, Bases and Salts English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

9th Standard

    Reg.No. :
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Science

Time : 00:10:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  1. Apple contains malic acid. Orange contains_______

    (a)

    citric acid,

    (b)

    ascorbic acid

    (c)

    citric acid,

    (d)

    acid

  2. Acids turn blue litmus paper to_______

    (a)

    Green

    (b)

    Red

    (c)

    Orange

    (d)

    Orange

  3. pH value of human blood is_________

    (a)

    7.0

    (b)

    7.4

    (c)

    7.6

    (d)

    7.6

  4. You are given pure water to test the pH value using pH paper. It shows colour

    (a)

    White

    (b)

    black

    (c)

    green

    (d)

    black

  5. Hydrochloric Acid reacts with metal bicarbonates to give______

    (a)

    metal chloride

    (b)

    water

    (c)

    carbon di - oxide

    (d)

    all the above

  6. The molar ratio of hydrochloric acid and nitric acid in aquaregia is______

    (a)

    1:3

    (b)

    6:3

    (c)

    2:3

    (d)

    3:1

  7. Bases ionise in water to form______ions

    (a)

    H+

    (b)

    H3O+

    (c)

    OH-

    (d)

    O2-

  8. Which of the following are the is a weak bases?

    (a)

    NH4OH & NaOH

    (b)

    Ca(OH)2& KOH

    (c)

    NH4OH & Ca(OH)2

    (d)

    NaOH & KOH

  9. Which of the following solution is soapy to touch?

    (a)

    Acidic

    (b)

    Basic

    (c)

    Salt

    (d)

    Aquaregia

  10. The pH value of neutral solution is______

    (a)

    =7

    (b)

    <7

    (c)

    none of the above

    (d)

    -7

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