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NEET UG Principles Related to Practical Chemistry — practice questions — page 2

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 31–60 of 97.

Phosphate boiled with HNO3 and ammonium molybdate gives:Read the answer and worked solution →Which metal wire is used to perform the flame test in the laboratory?Read the answer and worked solution →For a flame test, the salt is made into a paste with conc. HCl because metal chlorides are:Read the answer and worked solution →Which flame colour confirms barium ions in group V analysis?Read the answer and worked solution →A crimson red flame in the group V flame test confirms which cation?Read the answer and worked solution →The borax bead test is used only for which kind of salts?Read the answer and worked solution →On strong heating, anhydrous borax decomposes into sodium metaborate and:Read the answer and worked solution →In which form is lead precipitated in group I of cation analysis?Read the answer and worked solution →A hot solution of the group I precipitate gives what with potassium iodide?Read the answer and worked solution →Hot dissolved PbI2 is cooled. What is seen?Read the answer and worked solution →Lead sulphate dissolves in ammonium acetate solution by forming which ion?Read the answer and worked solution →Group II cations are precipitated by passing which gas through the acidified solution?Read the answer and worked solution →A group II sulphide precipitate is insoluble in yellow ammonium sulphide. Which subgroup is present?Read the answer and worked solution →A black precipitate in group II indicates the presence of which ions?Read the answer and worked solution →Basic copper sulphate dissolves in excess NH4OH to give a blue solution of:Read the answer and worked solution →The copper solution, acidified with acetic acid, gives what with potassium ferrocyanide?Read the answer and worked solution →Why is conc. HNO3 added to the original solution before group III precipitation?Read the answer and worked solution →Which reagent precipitates group III cations?Read the answer and worked solution →What colour does potassium thiocyanate give with Fe3+ ions?Read the answer and worked solution →What is the formula of the colloidal 'soluble Prussian blue' formed with excess ferrocyanide?Read the answer and worked solution →A flesh coloured sulphide precipitate in group IV indicates which cation?Read the answer and worked solution →Dimethylglyoxime gives a brilliant red precipitate in ammoniacal solution with:Read the answer and worked solution →White manganese hydroxide turns brown on standing in air. Why?Read the answer and worked solution →Zinc ions with potassium ferrocyanide give:Read the answer and worked solution →In which form are group V cations precipitated?Read the answer and worked solution →The group V precipitate in acetic acid gives a yellow precipitate with K2CrO4. Which ion?Read the answer and worked solution →Strontium is confirmed by a white precipitate with ammonium sulphate. What is it?Read the answer and worked solution →Calcium in the group V solution is confirmed by a white precipitate with:Read the answer and worked solution →Mg2+ with Na2HPO4 in ammoniacal solution gives:Read the answer and worked solution →Why is magnesium not precipitated along with group V carbonates?Read the answer and worked solution →

Worked practice questions

Phosphate boiled with HNO3 and ammonium molybdate gives:

  1. Canary yellow precipitate
  2. Curdy white precipitate
  3. Blood red colouration
  4. Dark brown ring layer
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Correct answer: A. Canary yellow precipitate

Phosphate forms canary yellow ammonium phosphomolybdate with ammonium molybdate in nitric acid.

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Which metal wire is used to perform the flame test in the laboratory?

  1. Iron
  2. Silver
  3. Platinum
  4. Copper
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Correct answer: C. Platinum

Platinum is used because it does not colour the flame and resists attack by the acid and the salt.

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For a flame test, the salt is made into a paste with conc. HCl because metal chlorides are:

  1. Volatile
  2. Oxidising
  3. Coloured
  4. Insoluble
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Correct answer: A. Volatile

Metal chlorides vaporise easily in the non-luminous flame, so they impart their colour to it.

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More Chemistry topics

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