Principles Related to Practical Chemistry — DPP 1

20 NEET questions from Principles Related to Practical Chemistry, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
An aqueous solution of gas(X) which turns red litmus blue, when added in excess to a copper sulphate solution, a deep blue colour is obtained. Identify (X).
  1. A NH₃
  2. B SO₂
  3. C CO₂
  4. D CO
Show answer & explanation

Correct answer: A

$\mathrm{X}-\mathrm{NH}_{3}$
Reaction:
$\mathrm{CuSO}_{4}+4 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}$
Therefore, option (1) is the correct answer.
2
A nitrogenous compound on reaction with Zn dust and $\mathrm { NH } _ { 4 } \mathrm { Cl }$ gives a derivative which gives a grey black silver with Tollen's reagent. The functional group in nitrogenous compound is:
  1. A - NO.
  2. B - $\mathrm { NO } _ { 2 }$.
  3. C - NHOH.
  4. D - $\mathrm { CONH } _ { 2 }$.
Show answer

Correct answer: B

3
Group VI contains:
  1. A $\mathrm { Mg } ^ { 2 + }$ ion
  2. B $\mathrm { Na } ^ { + }$ion
  3. C $\mathrm { NH } _ { 4 } { } ^ { + }$ion
  4. D Both (A) and (B)
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Correct answer: A

4
The violet colour obtained during the test of sulphur by Lassaigne's test is due to the formation of:
  1. A $\mathrm { Na } _ { 2 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 5 } \mathrm {S} \right]$
  2. B $\mathrm { Na } _ { 2 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 5 } \mathrm { NO } \right]$
  3. C $\mathrm { Na } _ { 2 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right]$
  4. D $\mathrm { Na } _ { 4 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 5 } \mathrm { NOS } \right]$
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Correct answer: D

5
An anion which has smell of vinegar and reacts with iron (III) chloride gives deep red colouration. Anion will be:
  1. A $\mathrm { CO } _ { 3 } ^ { 2 - }$
  2. B $\mathrm { SO } _ { 3 } { } ^ { 2 - }$
  3. C $\mathrm { CH } _ { 3 } \mathrm { COO } ^ { - }$
  4. D $\mathrm { S } ^ { 2 - }$
Show answer

Correct answer: C

6
Which of the following carbonate is white in colour?
  1. A $\mathrm { SrCO } _ { 3 }$
  2. B $\mathrm { CaCO } _ { 3 }$
  3. C $\mathrm { BaCO } _ { 3 }$
  4. D All of these
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Correct answer: D

7
On Heating, borax forms a colourless glassy bead of $\_\_\_\_$ .
  1. A $\mathrm { NaBO } _ { 2 }$ and $\mathrm { B } _ { 2 } \mathrm { O } _ { 3 }$
  2. B $\mathrm { Na } _ { 2 } \mathrm {B} _ { 4 } \mathrm { O } _ { 7 }$
  3. C $\mathrm { Na } _ { 2 } \mathrm {B} _ { 4 } \mathrm { O } _ { 7 } \cdot \mathrm { H } _ { 2 } \mathrm { O }$
  4. D $\mathrm { B } _ { 2 } \mathrm { O } _ { 3 }$
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Correct answer: A

8
During the titration of oxalic acid vs $\mathrm { KMnO } _ { 4 }$ which substance acts as an indicator?
  1. A Oxalic acid
  2. B Methyl orange
  3. C $\mathrm { KMnO } _ { 4 }$
  4. D DMG
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Correct answer: C

9
Match Column-I with Column-II.
Principles Related to Practical Chemistry – NEET-17827
  1. A A → S; B → Q; C → R; D → P
  2. B A → P; B → R; C → Q; D → S
  3. C A → P; B → Q; C → R; D → S
  4. D A → Q; B → P; C → R; D → S
Show answer

Correct answer: B

10
A metal salt solution when treated with dimethyl glyoxime and $\mathrm { NH } _ { 4 } \mathrm { OH }$ gives a rose red complex. The metal is:
  1. A Ni
  2. B Zn
  3. C Co
  4. D Mn
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Correct answer: A

11
BaCl$_{2}$ solution gives a white precipitate with solution of a salt, which dissolves in dilute hydrochloric acid with the evolution of colourless, pungent smelling gas. The gas as well as the salt both are used as bleaching agent in the textile industries. The salt contains:
  1. A sulphite
  2. B sulphite
  3. C acetate
  4. D carbonate
Show answer & explanation

Correct answer: A

$\mathrm{Ba}^{2+}+\mathrm{SO}_{3}{ }^{2-} \longrightarrow \mathrm{BaSO}_{3} \downarrow$ (White)
$\mathrm{BaSO}_{3}+2 \mathrm{HCl} \rightarrow \mathrm{BaCl}_{2}+\mathrm{SO}_{2}$ (Colourless pungent smelling gas) + $\mathrm{H}_{2} \mathrm{O}$
$\mathrm{SO}_{3}^{2-}$ and $\mathrm{SO}_{2}$ both act as bleaching agent.
Therefore, option (1) is the correct answer.
12
Which of the following characteristics of gas is not correct?
  1. A $\mathrm { SO } _ { 2 }$ gas - Suffocating smell of burning sulphur turns acidified potassium dichromate solution or paper green.
  2. B HCl gas - Pungent smell, white fumes with ammonia.
  3. C Acetic acid vapours - Characteristic vinegar like smell.
  4. D $\mathrm { NH } _ { 3 }$ gas - Characteristic smell, turns Nessler's solution green.
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Correct answer: D

13
In cobalt nitrate test, which coloured mass of Zn metal is found?
  1. A Rinmann's green
  2. B Crimson red
  3. C Violet
  4. D Yellow
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Correct answer: A

14
Sulphide ion reacts with Na2[Fe(CN)5NO] to form a purple coloured compound (X). In this reaction, oxidation state of iron:
  1. A changes from +2 to +3
  2. B changes from +3 to +2.
  3. C changes from +2 to +4.
  4. D does not change
Show answer & explanation

Correct answer: D

$\mathrm{S}^{2-}+\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{5}(\mathrm{NO})\right]^{2-} \longrightarrow\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{5} \mathrm{NOS}\right]^{4-}$ (violet)
It is a ligand change reaction not a redox, where NO+ changes to (NOS)$^{–1}$.
Therefore, option (4) is the correct answer
15
What happens when dilute hydrochloric acid is added to sodium carbonate?
  1. A Carbon dioxide and water are formed.
  2. B Sodium chloride, carbon monoxide and water are formed.
  3. C Sodium chloride, carbon dioxide and water are formed.
  4. D Sodium chloride, carbon dioxide and hydrogen are formed.
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Correct answer: C

16
A solution reacts with crushed egg shells to give compound that turns lime water milky. The solution contains:
  1. A NaCl
  2. B dilute HCl
  3. C LiCl
  4. D KCl
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Correct answer: B

17
An aqueous solution of colourless metal sulphate M, gives a white precipitate with $\mathrm { NH } _ { 4 } \mathrm { OH }$. This is soluble in excess of $\mathrm { NH } _ { 4 } \mathrm { OH }$. On passing $\mathrm { H } _ { 2 } \mathrm {S}$ gas through this solution a white precipitate is formed. The metal M in the salt is:
  1. A Ca
  2. B Ba
  3. C Al
  4. D Zn
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Correct answer: D

18
Principles Related to Practical Chemistry – NEET-17817 and can be differentiated by:
  1. A carbylamine reaction.
  2. B $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$.
  3. C diazotisation followed by $\beta$-naphthol.
  4. D libermann's nitroso test.
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Correct answer: C

19
Aqueous solution of 6.3 g oxalic acid of 250 mL is prepared. What volume of 0.1 N NaOH is required for neutralisation of 10 mL oxalic acid solution?
  1. A 20 mL
  2. B 40 mL
  3. C 10 mL
  4. D 30 mL
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Correct answer: B

20
The blood red colour in the combination test of nitrogen and sulphur in organic compound is due to the formation of:
  1. A ferric sulphocyanide.
  2. B ferric acetate.
  3. C ferrous sulphocyanide.
  4. D ferric cyanide.
Show answer

Correct answer: C

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