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JEE • CHEMISTRY • PRACTICAL CHEMISTRY

Practical chemistry practice · Hard

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Hard

1 of 9

Analyzing +4 | -1

A pale green crystalline inorganic salt (A) dissolves freely in water. It gives a brown precipitate on addition of aqueous

\mathrm{NaOH}.

The solution of (A) also gives a black precipitate on bubbling

\mathrm{H}_2 \mathrm{S}

in alkaline medium. An aqueous solution of the (A) decolorizes the pink colour of the permanganate solution. The metal in the salt solution is

View answer and explanation

Correct option: D

Iron

Option D (Iron) is correct because the described reactions are characteristic of iron(II) ions in solution.

2 Hard

2 of 9

Analyzing +4 | -1

A student is asked to determine the degree of
hydration of a salt by finding the mass of a
clean dried crucible and lid followed by the
mass of the crucible and lid containing a
sample of the salt. The crucible, lid and salt
are heated in a Bunsen burner flame, cooled,
and weighed. If the crucible, lid and salt are
heated only once instead of the recommended
three times, what will be the effect on the
degree of hydration compared with the actual
value?

View answer and explanation

Correct option: B

Too low

The correct answer is B (Too low) because if the salt is heated only once, not all the water of hydration will be driven off, leading to an underestimation of the degree of hydration.

3 Hard

3 of 9

Analyzing +4 | -1

An equimolar mixture of ferrous oxalate & stannous chloride is treated with decinormal acidic

\mathrm{KMnO}_4

giving ferric, stannic & chlorate ions along with

\mathrm{CO}_2

gas. If the titre value is

225 \mathrm{~ml}.

Numbers of millimoles of chlorate ions produced are

View answer and explanation

Correct option: D

2.64 m moles

Option D is correct because the calculation of millimoles of chlorate ions produced is based on the stoichiometry of the redox reactions, resulting in 2.64 m moles.

4 Hard

4 of 9

Understanding +4 | -1

A purple coloured solution is added from a burette to

\mathrm{FeSO}_4

solution kept in the flask. After sometime, the purple colour changes to light pink. The ion formed from that solution is

View answer and explanation

Correct option: D

\mathrm{Mn}^{2+}

Option D (

\mathrm{Mn}^{2+}

) is correct because the purple color of

\mathrm{KMnO}_4

is due to

\mathrm{MnO}_4^{-}

which is reduced to the almost colorless

\mathrm{Mn}^{2+}

ion.

5 Hard

5 of 9

Application +4 | -1

16 \mathrm{~ml}

volume of

0.2 \mathrm{~M} \mathrm{~KMnO}_4

solution is needed to oxidize

25.00 \mathrm{~ml}

of a

\mathrm{FeSO}_4

solution in an acidic medium. What is the number of moles of

\mathrm{FeSO}_4

being oxidized for the reaction

View answer and explanation

Correct option: B

1.6 \times 10^{-2}

Option B (

1.6 \times 10^{-2}

) is correct because it represents the number of moles of FeSO4 oxidized, calculated using the stoichiometry of the redox reaction with KMnO4.

6 Hard

6 of 9

Remembering +4 | -1

The principal reason that solid sodium hydroxide is not used as a primary standard for acid-base titrations is that it

View answer and explanation

Correct option: A

Absorbs water from air

Option A (Absorbs water from air) is correct because solid sodium hydroxide is hygroscopic and readily absorbs moisture from the air, affecting its purity and concentration.

7 Hard

7 of 9

Analyzing +4 | -1

\mathrm{NaOH}

solution is to be standardized by titrating it against a known mass of potassium hydrogen phthalate. Which procedure will give a molarity of

\mathrm{NaOH}

that is too low?

View answer and explanation

Correct option: C

Neglecting to fill the tip of the buret with

\text{NaOH}

solution before titrating

Option C is correct. If the tip of the buret is not filled, the volume of NaOH dispensed will be less than what is read, leading to an underestimation of the NaOH molarity.

8 Hard

8 of 9

Application +4 | -1

100 \mathrm{~ml}

0.1 \mathrm{~M}

aqueous ferric alum solution is completely reduced with Iron to give Ferrous Ions. The volume of

0.1 \mathrm{~M}

acidified

\mathrm{KMnO}_4

solution required for complete reaction with ferrous Ions in the solution will be

View answer and explanation

Correct option: C

40 \mathrm{~ml}

Option C (40 ml) is correct because the volume of KMnO4 required is determined by the stoichiometry of the reactions involved in the reduction of ferric alum and subsequent oxidation of ferrous ions.

9 Hard

9 of 9

Analyzing +4 | -1

The molar mass of an unknown organic liquid

(M \sim 100)

is determined by placing

5 \mathrm{~mL}

of the liquid in a weighed

125-\mathrm{mL}

conical flask fitted with a piece of

{Al}

foil with a pin hole in it. The flask is heated in a boiling water bath until the liquid evaporates to expel the air and fill the flask with the unknown vapor at atmospheric pressure. After cooling to room temperature the flask and its contents are reweighed. The uncertainty in which piece of apparatus causes the largest percentage error in the molar mass?

View answer and explanation

Correct option: A

Balance

( \pm 0.01 \mathrm{~g})

Option A is correct because the balance has the smallest absolute uncertainty but contributes the largest percentage error due to its impact on the molar mass calculation.

Revision notes and key takeaways

Review PRACTICAL CHEMISTRY in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 9 single-correct-answer MCQs on PRACTICAL CHEMISTRY.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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