Home CHEMISTRY TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

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TOPIC 3 : WATER QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

HYDROGEN

QUESTIONS

1: Multiple choice.

    Choose the most correct answer from the given alternatives.

  (i) Which of the following compounds is not likely to contain hydrogen?

   A: water

   B: Copper oxide

   C: ammonia

   D: water gas

 (ii) Hydrogen does not support combustion but it is used as ________

   A: water gas fuel

   B: respiratory gas

   C: oxidant

   D: fire extinguisher

 (iii) Hydrogen gas is used to fill weather balloons because

  A: it is a gas

  B: it is heavier

  C: it is abundant

  D: it is lighter

 (iv) Hydrogen gas forms ammonia with_______ gas.

  A: nitrogen

  B: Oxygen

  C: carbon dioxide

  D: sulphur

 (v) ________ and _______ reacts slowly to produce water.

  A: oxygen and helium

  B: hydrogen and helium

  C: hydrogen and oxygen

  D: No answer

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

 (vi) _________ observed when a wooden glowing splint placed in a tool in which hydrogen is contained.

  A: yellow colour

  B: green colour

  C: explosion with pop sound

  D: clacking sound.

 (vii) When it is mixed with hydrogen a very hot flame is produced.

  A: oxygen gas

  B: chlorine gas

  C: neon

  D: argon

 (viii) Which of the following can not be used to prepare hydrogen gas?

  A: reaction of water with carbon at room temperature.

  B: reaction of dilute acid with zinc

  C: electrolysis of water

  D: reaction of water with certain metals

 (ix) The following statement is not true about hydrogen.

  A: it is lighter than air

  B: it burns with blue flame

  C: it is colourless

  D: it supports combustion.

 (x) The common industrial method of preparing hydrogen.

  A: electrolysis of copper sulphate

  B: electrolysis of bases

  C: decomposition of hydrogen peroxide

  D: electrolysis of water.

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. Matching items.

    Match items in list A with responses in list B.

     List A

(i) water gas fuel

(ii) chemical property of hydrogen

(iii) physical property of hydrogen

(iv) the property of hydrogen to have less denser than air

(v) Reason for hydrogen to be used in production of fuel

     List  B

 A: is reason for it to be filled in weather balloons.

 B: Tasteless

 C: flammability

 D: pop sound

 E: reacting with other substances at high temperature.

 F: used in rockets.

  1. Write T for the correct statement and F for incorrect statement.

 (i) Oxidation is the addition of hydrogen to the substance.

 (ii) reduction is removal of hydrogen from the substance.

 (iii) Hydrogen reacts with chlorine to produce hydrochloric acid.

 (iv) Hydrogen is most abundant gas on the earth.

 (v) Hydrogen made under the process known as Haber process.

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. List down uses of hydrogen
  1. (a) State the substance which used to test hydrogen.

     (b) Explain how we can identify the presence of hydrogen?

  1. State apparatus used in laboratory preparation of hydrogen and their uses.
  1. Mention:-

   (a) chemical properties of hydrogen

   (b) physical properties of hydrogen

  1. Explain why hydrogen:-

    (a) collected by downward displacement of water?

    (b) is not found in the atmosphere?

  1. Describe two methods for industrial manufacture of hydrogen.

         ANSWERS.

  1. (i) B(vi) C

    (ii) A            (vii) A

   (iii) D            (viii) A

   (iv) A              (ix) D

    (v) C               (x) D

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. (i) F(ii) E    (iii) B     (iv) A      (v) C
  1. (i) F

     (ii) F

     (iii) T

     (iv) F

     (v) F

  1. Uses of hydrogen include the following.

   (i) Hydrogen is used in the synthesis(production) of ammonia.

 This is done on large scale through the

laboratory process.

  (ii) Hydrogen is used in the Manufacture of margarine.

  (iii) Hydrogen is used to produce oxy-hydrogen flame.

 This flame can be used for welding and cutting metal.

  (iv) it is used to make fuel since it is highly flammable.

  1. (a) The substance used to test hydrogen is wooden glowing splint.

   (b) Hydrogen identified if explosion with a pop sound observed when the gas come into contact with a wooden glowing splint.

  1. The following are apparatus used to set the system of preparing hydrogen in the laboratory.

 (a) Thistle funnel

         Is used to transfer acidic solution into the flat bottomed flask.

  (b) Flat bottomed flask

         Is used to mix acidic solution(hydrochloric acid) with zinc granules.

 (c) Delivery tube

       Is used to transfer hydrogen into beehive stand.

  (d) Beehive stand

        Is used to connect delivery tube with gas jar.

  (e) Gas jar

        Is used to collect hydrogen gas

  (f) Trough

        Is used to hold water.

  1. (a) chemical properties of hydrogen include the following.

   (i) It combine easily with other chemicals substance at high temperature.

  (ii) It does not usually react with other element at room temperature.

  (iii) It is highly flammable and burns with a blue of flame.

  (iv) It reacts slowly with oxygen to produce water.

  (v) It is neither acidic nor basic

 (b) Physical Properties of Hydrogen

    (i) It is tasteless, colourless and odourless.

   (iii) It is lighter than air, Therefore it is in the atmosphere.

   (iii) It is only slightly soluble in water.

   (iv) It does not support combustion.

TOPIC 2 : HYDROGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

8.(a) hydrogen is collected by downward displacement of water because it is slightly soluble in water.

  (b) hydrogen is not found in the atmosphere because it is lighter such that it found above the atmosphere.

  1. Industrial methods of manufacturing hydrogen include the following.

  (i) Electrolysis of water

  (ii) Electrolysis of dilute sulphuric acid.

    Electrolysis of water.

    Electricity used to decompose water into hydrogen and oxygen. In this process hydrogen collected as gas at the cathode.

   Electrolysis of dilute sulphuric acid.

    Electricity decomposes sulphuric acid into hydrogen and sulphate.

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