The addition of dilute NaOH to a sample followed by heating evolved a gas, which turned redlitmus paper to blue. This reveals that the compound is likely to beA. an unknown compound of a gasB. an aldehydeC. an amideD. none of the aboveAn evolved gas that is neutral to litmus paper is likely to beA. carbon dioxide gasB. ammonia gasC. chlorine gasD. oxygenAn example of a choking gas is------------A. carbon monoxide gasB. oxygen gasC. nitrogen gasD. ammonia gasThe general formula for carboxylic acid isA. RCOB. RCOOC. RCOOOD. RCOOHEthanoic acid is the same as------------A. acetic acidB. methaneC. propaneD. acetoneEthanol is a compound that belongs to the family ofA. alkanoic acidsB. aldehydesC. alkanolsD. none of the aboveAkinade was given some ethanol in a small vial. She added 2 cm3 of ethanoic acid and a few dropsof concentrated H2SO4. On heating, he observedA. a pungent smellB. a choking smellC. no smell was given offD. a pleasant fruity smell
Question
The addition of dilute NaOH to a sample followed by heating evolved a gas, which turned redlitmus paper to blue. This reveals that the compound is likely to beA. an unknown compound of a gasB. an aldehydeC. an amideD. none of the aboveAn evolved gas that is neutral to litmus paper is likely to beA. carbon dioxide gasB. ammonia gasC. chlorine gasD. oxygenAn example of a choking gas is------------A. carbon monoxide gasB. oxygen gasC. nitrogen gasD. ammonia gasThe general formula for carboxylic acid isA. RCOB. RCOOC. RCOOOD. RCOOHEthanoic acid is the same as------------A. acetic acidB. methaneC. propaneD. acetoneEthanol is a compound that belongs to the family ofA. alkanoic acidsB. aldehydesC. alkanolsD. none of the aboveAkinade was given some ethanol in a small vial. She added 2 cm3 of ethanoic acid and a few dropsof concentrated H2SO4. On heating, he observedA. a pungent smellB. a choking smellC. no smell was given offD. a pleasant fruity smell
Solution
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The addition of dilute NaOH to a sample followed by heating evolved a gas, which turned red litmus paper to blue. This reveals that the compound is likely to be an amide (C). Amides react with NaOH to produce ammonia gas, which is a basic gas and turns red litmus paper blue.
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An evolved gas that is neutral to litmus paper is likely to be oxygen (D). Oxygen is a neutral gas and does not affect the color of litmus paper.
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An example of a choking gas is ammonia gas (D). Ammonia gas has a strong, pungent smell that can cause choking.
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The general formula for carboxylic acid is RCOOH (D). This represents a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-OH), attached to a hydrocarbon chain represented by R.
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Ethanoic acid is the same as acetic acid (A). Both names refer to the same compound, CH3COOH.
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Ethanol is a compound that belongs to the family of alkanols (C). Alkanols, also known as alcohols, have a hydroxyl (-OH) group attached to a hydrocarbon chain.
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Akinade was given some ethanol in a small vial. She added 2 cm3 of ethanoic acid and a few drops of concentrated H2SO4. On heating, he observed a pleasant fruity smell (D). This is the smell of an ester being formed, in this case, ethyl ethanoate, which has a fruity smell.
Similar Questions
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Another student was given a pale violet solid. He was told that it contained two cations (positiveions) from this listLi+ Ca2+ Fe2+ NH+4 Fe3+He performed a flame test on the solid.He then dissolved a small sample of the solid in water, a yellow solution was formed.He added sodium hydroxide solution and then warmed the mixture.The table shows his observations.Test Observationflame test no positive resultadd sodium hydroxide solution and warm brown precipitatea pungent - smelling gas was evolvedthe gas turned damp red litmus paper blue(i) The flame test gave no positive result.State the two cations from the list that are not present in the solidand(ii) Identify the pungent - smelling gas given off and explain why the red litmus paper must bedamp before it is used.(iii) Identify the two cations present in the pale violet solidand5. Some iron (II) sulfate (FeSO4) is dissolved in water to make a solution.(a) A reaction takes place when sodium hydroxide solution is added to a solution of iron (ⅠⅠ) sulfate.(i) Complete the word equation to show this reaction(ii) State what you would observe in this reaction._______________________________________________________________________________________________________________(b) Barium chloride is used to test for sulfate ions.(i) Barium chloride solution is added to another solution of iron (ⅠⅠ) sulfate. A whiteprecipitate forms. Identify the white precipitate.________________________________________________________________________________________________(ii) In this test, another substance should be added to react with any carbonate ions thatmight be present. Identify this other substance and state one observation that would be madeif carbonate ions were present.Other substance ___________________________________Observation __________________________________________________________________________________(C) A compound with the formula (NH4 )2Fe(SO4)2 gives the same results in the tests in parts (a)and (b) as iron (ⅠⅠ) sulfate (FeSO4). Describe how you could show that a solution of (NH4)2Fe(SO4)2contains ammonium ions.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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