Principles Related to Practical Chemistry — DPP 3

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.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Which of the following will not react with each other when heated together?
  1. A $\mathrm { BeO } + \mathrm { MgO } 4$
  2. B $\mathrm { Li } _ { 2 } \mathrm { CO } _ { 3 } + \mathrm { BeO }$
  3. C $\mathrm { MgO } + \mathrm { CaCO } _ { 3 }$
  4. D $\mathrm { MgCO } _ { 3 } + \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 }$
Show answer

Correct answer: C

2
A mixture when rubbed with organic acid smells like vinegar. It contains:
  1. A sulphate
  2. B nitrate
  3. C nitrite
  4. D acetate
Show answer

Correct answer: D

3
On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be:
  1. A $\mathrm { PbCO } _ { 3 }$
  2. B $\mathrm { MgCO } _ { 3 }$
  3. C $\mathrm { ZnCO } _ { 3 }$
  4. D $\mathrm { K } _ { 2 } \mathrm { CO } _ { 3 }$
Show answer

Correct answer: C

4
Be and Mg do not impart colour to flame:
  1. A due to very high IE.
  2. B due to higher ionic potential.
  3. C due to their greater covalent character.
  4. D All of these
Show answer

Correct answer: A

5
Lassaigne's test (with silver nitrate) is commonly used to detect halogens such as chlorine, bromine and iodine but not useful to detect fluorine because the product AgF formed is:
  1. A volatile
  2. B reactive
  3. C explosive
  4. D soluble in water
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Correct answer: D

6
Directions: These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions, you are required to choose any one of the following four responses.
Assertion: Sulphate is estimated as BaSO4, not as MgSO$_{4}$.
Reason: Ionic radius of Mg²⁺ is smaller than that of Ba$^{2+}$.
  1. A Both Assertion (A) and Reason (R) are True and the Reason (R) is a correct explanation of the Assertion (A).
  2. B Both Assertion (A) and Reason (R) are True but Reason (R) is not a correct explanation of the Assertion (A).
  3. C Assertion (A) is True but the Reason (R) is False.
  4. D Assertion (A) is False but Reason (R) is True.
Show answer

Correct answer: B

7
The hottest part of the flame of a Bunsen burner is the
  1. A zone of complete combustion.
  2. B blue zone.
  3. C zone of partial combustion.
  4. D all parts of the flame are equally hot.
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Correct answer: A

8
If addition of conc. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ is made to an unknown salt, a colourless and odourless gas is produced then which of the following can be present?
  1. A $\mathrm { Cl } ^ { - }$
  2. B $\mathrm { S } ^ { 2 - }$
  3. C $\mathrm { CO } _ { 3 } ^ { 2 - }$
  4. D $\mathrm { NO } _ { 3 } ^ { - }$
Show answer

Correct answer: A

9
Which of the following salts evolved brown fumes on treatment with conc. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ ?
  1. A Nitrate
  2. B Bromide
  3. C Both (A) and (B)
  4. D None of these
Show answer

Correct answer: C

10
The acidic solution of a salt produces blue colour with KI starch solution. The reaction indicates the presence of:
  1. A sulphite
  2. B bromide
  3. C nitrite
  4. D chloride
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Correct answer: C

11
If 83 mL of 0.45 M NaOH solution neutralizes a 235 mL HCl solution. Calculate the molarity of the HCl solution.
  1. A 0.12
  2. B 0.16
  3. C 0.1
  4. D 0.2
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Correct answer: B

12
Why is concentrated HCl used to dissolve the given metal salt in the flame test?
  1. A Strong acids produce better flame test.
  2. B Volatile metal chloride produce better flame test.
  3. C HCl is non-volatile.
  4. D Sharper colour are seen in the flame in presence of $\mathrm { Cl } ^ { - }$ ions.
Show answer & explanation

Correct answer: B

Because volatile metal chloride produce better flame test.
Therefore, option (2) is the correct answer
13
How many water of crystallisation are in Mohr's salt?
  1. A 3
  2. B 2
  3. C 1
  4. D 6
Show answer

Correct answer: D

14
When excess of dilute $\mathrm { NH } _ { 4 } \mathrm { OH }$ is added to an aqueous solution of copper sulphate, an intense blue colour is developed. This is due to the formation of:
  1. A $\left[ \mathrm { Cu } \left( \mathrm { NH } _ { 3 } \right) _ { 6 } \right] ^ { 2 + }$
  2. B $\mathrm { Cu } ( \mathrm { OH } ) _ { 2 }$
  3. C $\left[ \mathrm { Cu } \left( \mathrm { NH } _ { 3 } \right) _ { 4 } \right] ^ { 2 + }$
  4. D $\left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { SO } _ { 4 }$
Show answer & explanation

Correct answer: C

$\mathrm{Cu}(\mathrm{OH})_{2} \cdot \mathrm{CuSO}_{4} \downarrow+8 \mathrm{NH}_{3} \longrightarrow 2\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+\mathrm{SO}_{4}{ }^{2-}+2 \mathrm{OH}^{-}$
Therefore, option (3) is the correct answer
15
In the Borax bead test of $\mathrm { Cu } ^ { 2 + }$, the blue colour of bead is due to the formation of:
  1. A $\mathrm { B } _ { 2 } \mathrm { O } _ { 3 }$
  2. B $\mathrm { Cu } _ { 3 } \mathrm {B} _ { 2 }$
  3. C $\mathrm { Cu } \left( \mathrm { BO } _ { 2 } \right) _ { 2 }$
  4. D CuO
Show answer

Correct answer: C

16
Which of the following metal nitrate will give metal and oxygen on heating?
  1. A $\mathrm { KNO } _ { 3 }$
  2. B $\mathrm { NaNO } _ { 3 }$
  3. C $\mathrm { AgNO } _ { 3 }$
  4. D $\mathrm { RbNO } _ { 3 }$
Show answer

Correct answer: C

17
Which of the following anions are identified by dil. HCl ?
  1. A $\mathrm { NO } _ { 2 } ^ { - } , \mathrm { NO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - }$
  2. B $\mathrm { NO } _ { 2 } ^ { - } , \mathrm { NO } _ { 3 } ^ { - } , \mathrm { SO } _ { 3 } ^ { 2 - }$
  3. C $\mathrm { S } ^ { 2 - } , \mathrm { SO } _ { 3 } ^ { 2 - } , \mathrm { NO } _ { 2 } ^ { - }$
  4. D $\mathrm { I } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - } , \mathrm { SO } _ { 3 } ^ { 2 - }$
Show answer

Correct answer: C

18
An organic compound which produces a bluish green coloured flame on heating in presence of copper is:
  1. A benzaldehyde
  2. B benzoic acid
  3. C aniline
  4. D chlorobenzene
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Correct answer: D

19
Which of the following pair of anions are identified by conc. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ ?
  1. A $\mathrm { NO } _ { 3 } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - }$
  2. B $\mathrm { Cl } ^ { - } , \mathrm { NO } _ { 3 } ^ { - }$
  3. C $\mathrm { Br } ^ { - } , \mathrm { CO } _ { 3 } ^ { 2 - }$
  4. D $\mathrm { CO } _ { 3 } ^ { 2 - } , \mathrm { SO } _ { 3 } ^ { 2 - }$
Show answer

Correct answer: B

20
In which of the following reactions a reddish-brown coloured gas is evolved?
  1. A $\mathrm { KBr } ( \mathrm { s } ) +$ conc. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } \longrightarrow$
  2. B $\mathrm { NH } _ { 4 } \mathrm { NO } _ { 2 } \xrightarrow { \Delta }$
  3. C $\mathrm { NaNO } _ { 3 } \xrightarrow [ 800 ^ { \circ } \mathrm { C } ] { \Delta }$
  4. D $\mathrm { Na } _ { 2 } \mathrm {~S} _ { 2 } \mathrm { O } _ { 3 } \xrightarrow { \mathrm { I } _ { 2 } } \mathrm { NaI } +$ $\_\_\_\_$
Show answer

Correct answer: A

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