Insoluble Barium sulphate was formed which coated the sulphite preventing further reaction
johnmulu answered the question on February 6, 2017 at 05:56
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On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed
(Solved)
On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed. When excess aqueous ammonia was added to solution S, a deep blue solution was formed.
a) Identify the cation in solid K
b) Identify the two anions in solution S
Date posted:
February 6, 2017
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Answers (1)
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Describe how formation of nitrogen (II) oxide in the internal combustion engine leads to gaseous pollution
(Solved)
Describe how formation of nitrogen (II) oxide in the internal combustion engine leads to gaseous pollution.
Date posted:
February 6, 2017
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Answers (1)
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Give a reason why nitrogen (II) oxide is not formed at room temperature
(Solved)
Give a reason why nitrogen (II) oxide is not formed at room temperature.
Date posted:
February 6, 2017
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Answers (1)
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Describe the process by which Nitrogen is obtained from air on a large scale
(Solved)
Describe the process by which Nitrogen is obtained from air on a large scale.
Date posted:
February 6, 2017
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Answers (1)
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The use of materials made of lead in roofing and in water pipes is being discouraged. State:
(Solved)
The use of materials made of lead in roofing and in water pipes is being discouraged. State:
i) Two reasons why these materials have been used in the past
ii) One reason why their use is being discouraged
Date posted:
February 6, 2017
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Answers (1)
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Why is high temperature required for nitrogen to react with oxygen?
(Solved)
Explain why a high temperature is required for nitrogen to react with oxygen.
Date posted:
February 6, 2017
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Answers (1)
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Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. State how these gases affect the environment
(Solved)
Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. State how these gases affect the environment.
Date posted:
February 6, 2017
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Answers (1)
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Concentrated nitric (V) acid was added to Iron (II) sulpahate acidified with dilute sulphuric (VI) acid the mixture heated...
(Solved)
Concentrated nitric (V) acid was added to Iron (II) sulpahate acidified with dilute sulphuric (VI) acid the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.
Date posted:
February 6, 2017
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Answers (1)
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State and explain the observations that would be made if a sample of sulphur is heated with concentrated nitric (V) acid
(Solved)
State and explain the observations that would be made if a sample of sulphur is heated with concentrated nitric (V) acid.
Date posted:
February 3, 2017
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Answers (1)
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Ethane gas was reacted with 1 mole of bromine gas. State one observation made during this reaction
(Solved)
Ethane gas was reacted with 1 mole of bromine gas. State one observation made during this reaction.
Date posted:
February 3, 2017
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Answers (1)
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What condition could cause a poisonous gas to be formed when kerosene is burnt?
(Solved)
What condition could cause a poisonous gas to be formed when kerosene is burnt? Explain
Date posted:
February 3, 2017
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Answers (1)
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Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide
(Solved)
Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide.
Date posted:
February 3, 2017
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Answers (1)
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State the Gay Lussac’s Law
(Solved)
Start the Gay Lussac’s Law.
Date posted:
February 3, 2017
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Answers (1)
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Describe how a sample of pure sodium sulphate crystals can be prepared
(Solved)
Starting with 50 cm 3 of 2.8 M sodium hydroxide, describe how a sample of pure sodium sulphate crystals can be prepared.
Date posted:
February 3, 2017
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Answers (1)
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State why it is not advisable to wash vehicles using sea water
(Solved)
State why it is not advisable to wash vehicles using sea water.
Date posted:
February 3, 2017
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Answers (1)
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State the Graham’s law of diffusion
(Solved)
State the Graham’s law of diffusion.
Date posted:
February 3, 2017
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Answers (1)
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A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking.
(Solved)
A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking. State and explain the observation that were made
Date posted:
February 3, 2017
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Answers (1)
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In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube
(Solved)
In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube first changed blue then red. Explain these observations
Date posted:
February 3, 2017
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Answers (1)
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Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
(Solved)
Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
a) Name the two oxides
b) State one use of the two oxide
Date posted:
February 3, 2017
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Answers (1)
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What is the role of carbon (IV) oxide in fire extinguishing?
(Solved)
What is the role of carbon (IV) oxide in fire extinguishing?
Date posted:
February 3, 2017
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Answers (1)