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NEET UG Principles Related to Practical Chemistry — practice questions — page 3

Explore 97 free Principles Related to Practical Chemistry questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Principles Related to Practical Chemistry questions and exercises with answers

Showing questions 61–90 of 97.

What serves as the indicator when oxalic acid is titrated with KMnO4?Read the answer and worked solution →What marks the end point in a permanganate titration of oxalic acid?Read the answer and worked solution →Why is hydrochloric acid avoided for acidifying KMnO4 titrations?Read the answer and worked solution →Why is nitric acid not used to acidify permanganate titrations?Read the answer and worked solution →Why does the oxalate-KMnO4 reaction speed up over time?Read the answer and worked solution →Why must a KMnO4 burette have a glass stopcock?Read the answer and worked solution →Which meniscus is read in a burette holding KMnO4 solution?Read the answer and worked solution →10.0 mL of 0.1 M oxalic acid needs 20.0 mL of acidified KMnO4. What is the KMnO4 molarity?Read the answer and worked solution →How many electrons does one oxalate ion lose when oxidised by acidified KMnO4?Read the answer and worked solution →Why is Mohr's salt solution titrated cold?Read the answer and worked solution →Mohr's salt has molar mass 392 g/mol. What mass makes 250 mL of a 0.05 M solution?Read the answer and worked solution →10 mL of 0.05 M Mohr's salt is titrated with 0.01 M KMnO4. What volume of KMnO4 is used?Read the answer and worked solution →Decolourisation of bromine in CCl4 by an organic compound indicates:Read the answer and worked solution →Addition of bromine across an alkene double bond gives a:Read the answer and worked solution →Alkenes decolourise neutral or alkaline KMnO4 in Baeyer's test, forming:Read the answer and worked solution →A red colour with ceric ammonium nitrate indicates which group?Read the answer and worked solution →Lucas reagent, used to classify alcohols, is a mixture of:Read the answer and worked solution →Which type of alcohol reacts almost instantly with Lucas reagent?Read the answer and worked solution →With Lucas reagent, a secondary alcohol forms a separate layer:Read the answer and worked solution →Which structural unit must an alcohol have to give a positive iodoform test?Read the answer and worked solution →How does a positive iodoform test appear?Read the answer and worked solution →What colour does phenol give with neutral ferric chloride solution?Read the answer and worked solution →Phenol heated with phthalic anhydride and conc. H2SO4 gives which dye?Read the answer and worked solution →A yellow or orange precipitate with 2,4-DNP reagent shows which group?Read the answer and worked solution →Schiff's reagent turns pink with which class of compounds?Read the answer and worked solution →What is Fehling's solution A?Read the answer and worked solution →In Benedict's reagent, cupric ions are kept in solution by complexing with:Read the answer and worked solution →An aldehyde heated with Fehling's reagent gives a brick red precipitate of:Read the answer and worked solution →Which compounds do not give a positive Fehling's test?Read the answer and worked solution →What forms inside the test tube in a positive Tollens' test?Read the answer and worked solution →

Worked practice questions

What serves as the indicator when oxalic acid is titrated with KMnO4?

  1. Methyl orange
  2. KMnO4 itself
  3. Phenolphthalein
  4. Starch solution
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Correct answer: B. KMnO4 itself

Permanganate is intensely coloured, so its own first lasting pink tint marks the end point.

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What marks the end point in a permanganate titration of oxalic acid?

  1. Solution turns yellow
  2. Solution turns colourless
  3. Deep violet colour fades
  4. Permanent light pink colour
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Correct answer: D. Permanent light pink colour

A slight excess of unreacted permanganate gives a permanent light pink colour at the end point.

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Why is hydrochloric acid avoided for acidifying KMnO4 titrations?

  1. It slows the reaction badly
  2. It is oxidised to chlorine
  3. It forms a white precipitate
  4. It is too weak an acid
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Correct answer: B. It is oxidised to chlorine

Permanganate oxidises chloride to chlorine, which wastes titrant and itself acts as an oxidant.

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