Home CHEMISTRY TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

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TOPIC 3 : WATER QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

OXYGEN

QUESTIONS

1: Multiple choice.

    Choose the most correct answer from the given alternatives.

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

   A: water

   B: Copper oxide

   C: ammonia

   D: carbonate

 (ii) Oxygen supports combustion and it is not used in ________

   A: welding

   B: respiration

   C: incineration

   D: extinguishing fire

 (iii) Oxygen gas found in the atmosphere because

  A: it is a gas

  B: it is useful

  C: it is denser

  D: it is lighter

 (iv) Oxygen gas forms water with_______ gas.

  A: nitrogen

  B: hydrogen

  C: carbon dioxide

  D: sulphur

 (v) ________ is a removal of oxygen from the substance.

  A: oxidation

  B: reduction

  C: redox

  D: No answer

 (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: light

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

  A: hydrogen gas

  B: chlorine gas

  C: neon

  D: argon

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

  A: potassium chlorate

  B: any compound rich in oxygen

  C: electrolysis concentrated sulphuric acid

  D: hydrogen peroxide

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

  A: it is used to manufacture ammonia with nitrogen.

  B: it burns fuels

  C: it is colourless

  D: it supports combustion.

 (x) The common industrial method of preparing oxygen.

  A: electrolysis of copper sulphate

  B: electrolysis of bases

  C: decomposition of hydrogen peroxide

  D: fractional distillation of liquefied air.

  1. Matching items.

    Match items in list A with responses in list B.

     List A

(i) Percentage of oxygen in air we breath

(ii) chemical property of oxygen

(iii) physical property of oxygen

(iv) the property of oxygen to be less denser than air.

(v) Reason for hydrogen to be used in rocket.

     List  B

 A: it oxidises fuel.

 B: Tasteless

 C: forming metallic oxides

 D: it collected over water.

 E: 79%

 F: used in rockets.

G: 21%

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

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

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

 (iii) Oxygen forms basic oxides with non-metals

 (iv) Oxygen form acidic oxides with metals

 (v) Hydrochloric acid is used to prepare oxygen in the laboratory.

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

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

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

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

   (a) chemical properties of oxygen

   (b) physical properties of oxygen

  1. Explain why hydrogen collected by downward displacement of water when preparing it in the laboratory?
  2. Describe

(a) industrial manufacture of oxygen.

(b) i) laboratory preparation of oxygen by using hydrogen peroxide.

  1. ii) State the function of the manganese IV oxide  during preparation of oxygen by using hydrogen peroxide.
  2. Give the definitions of oxidation and reduction.

    ANSWERS

  1. (i) C      vi) D

   (ii) D          vii) A

  (iii) C         viii) C

  (iv) B          ix) A

   (v) B           x) D

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. (i) G(ii) C    (iii) B    (iv) D     (v)A
  2. (i) T(ii) T    (iii) F   (iv) F      (v) F
  3. Uses of oxygen.

   -it used in respiration process

   -it is used in pulp and paper making

   -it is used in metal cutting

   -it is used as fuel oxidiser in rockets

   -it is used in hospital for people with breathing problem.

   -it used in glass making

   -it is used in treatment of sewage plants.

   -it used to manufacture synthetic fuels

   -it is used to manufacture chemicals. For example acids and oxides.

  1. (a) Chemical test for oxygen is a glowing wooden splint.

  (b)oxygen identified is a glowing wooden splint relights when it is lowered into a gas jar of oxygen gas.

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

 (a) Thistle/dropping 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.

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. (a)Chemical Properties of Oxygen

  (i) It supports burning.

  (ii) It is an oxidising agent.

  (iii) It reacts with metals to form basic oxides.

  (iv) It reacts with non- Metal to form acidic oxides.

  (a) Physical Properties of Oxygen

   (i) Oxygen is colourless, tasteless and odourless.

   (ii) It is slightly dissolves in cold water.

   (iii) It is less denser than air.

   (iv) It boils at -1830°C.

   (v) It freezes at – 2180°C

  1. Hydrogen is collected by downward displacement of water because it is less denser than air.

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. (a) Industrial preparation ofoxygen is manufactured by fractional distillation of liquefied air after water and dust being removed. Where by different gases that forms air are separated.

  -carbon dioxide liquefies at -79°C. At this point it removed from the mixture in which nitrogen and oxygen remained.

-nitrogen liquefies at -196°C and oxygen liquefies at -183°C. In order to obtain liquefied oxygen the mixture boiled  then nitrogen boils and rise to the top where it is piped off. The liquid oxygen collected.

  (b) (i) Oxygen is mostly prepared in the laboratory by using hydrogen peroxide in presence of manganese oxide.

      Hydrogen peroxide decomposed to form water and oxygen then oxygen collected in the gas jar.

   (ii) The function of manganese oxide is to speed up the rate of the reaction(decomposition of hydrogen peroxide) because it is used as a catalyst.

TOPIC 1: OXYGEN QUESTIONS WITH ANSWERS ~ CHEMISTRY FORM 2

  1. •Oxidation refers to:-

          -the process of adding oxygen to the substance.

         -the process of removing hydrogen from the substance.

        -the process of removing electron from the substance.

       -the process of increasing oxidation number.

  • Reduction refers to:-

        -the process of adding hydrogen to the substance.

       -the process of removing oxygen from the substance.

       -the process of adding electron to the substance.

       -the process of decreasing in oxidation number.

NB:

>Redox reaction:- is the reaction in which both reduction and oxidation are taking place.

>Oxidizing agent:- is a substance that influence or its presence makes oxidation to take place.

>Reducing agent:–  is substance that influence or its presence makes reduction to take place.

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