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Chemistry Assertion (A) & Reason (B) MCQ

Coordination Compounds · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 22 questions.

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Assertion (A) & Reason (B) MCQ

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22 questions · timed · auto-graded

Question 11 Mark
Two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
  2. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
  3. Assertion (A) is correct, but Reason (R) is incorrect statement.
  4. Assertion (A) is incorrect, but Reason (R) is correct statement.
Assertion (A): Linkage isomerism arises in coordination compounds because of ambidentate ligand.
Reason (R): Ambidentate ligand like NO2 has two different donor atoms i.e., N and O.
Answer
  1. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
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Question 21 Mark
Two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
  2. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
  3. Assertion (A) is correct, but Reason (R) is incorrect statement.
  4. Assertion (A) is incorrect, but Reason (R) is correct statement.
Assertion (A): Linkage isomerism arises in coordination compounds because of ambidentate ligand.
Reason (R): Ambidentate ligand like NO2 has two different donor atoms i.e., N and O.
Answer
  1. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
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Question 31 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Cu(NH3)4]2+ is coloured while [Cu(CN)4]3- ion is colourless.
Reason: [Cu(NH3)4]2+ has dsp2 hybridisation.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

[Cu(NH3)4]2+ is coloured due to the presence of unpaired electron whereas [Cu(CN)4]3- has no unpaired electron.

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Question 41 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The ligands nitro and nitrito are called ambidentate ligands.
Reason: An ambidentate ligand can attach to metal through two different atoms.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

When a monodentate ligand has two possible donor atoms and attached in two ways to the central metal atom then that ligand is called ambidentate ligand. This leads to linkage isomerism.

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Question 51 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Pt(NH3)2Cl2] is square planar.
Reason: The oxidation state of platinum is +2.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

The outer electronic configuration of platinum in ground state is Sd96s1. The pt2+ ion formed by the loss of two electrons has outer electronic configuration of 5d8. In the presence of strong ligands (NH3 molecules) two unpaired electrons in the Sd-subshell pair up. This is followed by dsp2 hybridisation resulting in the formation of four hybridised vacant orbitals which accommodate four pairs of electrons from four ligands (two from ammonia and two from Cl-). As such the resulting complex is square planar.

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Question 61 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Fe(CN)6]3- is weakly paramagnetic while [Fe(CN)6]4- is diamagnetic.
Reason: [Fe(CN)6]3- has +3 oxidation state while [Fe(CN)6]4- has +2 oxidation state.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

[Fe(CN)6]3- has one unpaired electron, hence it shows paramagnetic nature while [Fe(CN)6]4- possesses no unpaired electron and thus shows diamagnetic nature.

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Question 71 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [CrCl2(H2O)4]NO3 is dichlorotetraaquachromium (III) nitrate.
Reason: In writing the name of the complex cation is written first followed by the anion.
Answer
  1. Assertion is wrong statement but reason is correct statement.

Explanation:

Correct IUPAC name is tetraaquadich loridochromium (III) nitrate.

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Question 81 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Ethylenediaminetetraacetate ion forms an octahedral complex with the metal ion
Reason: It has six donor atoms which coordinate simultaneously to the metal ion.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
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Question 91 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: All the octahedral complexes of Ni2+ must be outer orbital complexes.
Reason: Outer orbital octahedral complexes are given by weak ligands
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

Ni2+ configuration,

During rearrangement only one 3d-orbital may be made available by pairing the electrons. Thus, inner d2sp3 hybridisation is not possible. So, only sp3d2 (outer) hybridisation can occur.

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Question 101 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Thiocarbonyl is a neutral ligand.
Reason: Thiocarbonyl has three donor atoms but behaves as a bidentate ligand.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

Thiocarbonyl (CS) has one donor atoms.

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Question 111 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Ni(CN)4]2- has square planar and [NiCl4]2- has tetrahedral shape.
Reason: [Ni(CN)4]2- is diamagnetic while [NiCl4]2- is paramagnetic.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

In [NiCl4]2-, the Cl- ligands present in the complex ion are less basic than CN-, as such no pairing of electrons in the 3d-subshell takes place. This results in sp3 hybridisation and the complex so formed is tetrahedral. On the other hand, in case of [Ni(CN)4]2-, the CN- ligands present in the complex ion are more basic than Cl-, as such pairing of electrons can take place in the 3d-subshell. Due to pairing of electrons in 3d-subshell, one of the d-orbital becomes vacant. This results in dsp2 hybridisation and the complex so formed is square planar and diamagnetic.

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Question 121 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Al(NH3)6]3+ does not exist in aqueous solution.
Reason: NH3 is a neutral ligand.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

The complex ion [Al(NH3)6]3+ undergoes the change into new complex ion [Al(H2O)6]3+ in aqueous medium due to higher heat of hydration of aluminium ion on account of its small size.

[Al(NH3)6]3+ + 6H2O → [Al(H2O)6]3+ + 6NH3

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Question 131 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Cu(OH)2 is soluble in NH4OH but not in NaOH.
Reason: Cu(OH)2 forms a soluble complex with NH3.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
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Question 141 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Zeise's salt is a $\pi$-bonded organometallic compound.
Reason: The oxidation number of platinum in Zeise's salt is +2.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

In these complexes, the metal and ligand fonn a bond that involves the $\pi$-electrons of the ligand and so it is a $\pi$-bonded organometallic compound.

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Question 151 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Cr(NH3)6]3+ is paramagnetic.
Reason: [Cr(NH3)6]3+ shows d2sp3 hybridisation.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

The Cr3+ ion has three unpaired electrons. It has d2sp3 hybridisation and it is paramagnetic.

Cr3+: 3d3

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Question 161 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Low spin complexes have less number of unpaired electrons.
Reason: [FeF6]3- is a low spin complex.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

[FeF6]3- is a high spin complex since F- is a weak field ligand.

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Question 171 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The ligand $\text{N}_3^-$ is named as nitride.
Reason: $\text{N}_3^-$ is derived from HN3.
Answer
  1. Assertion is wrong statement but reason is correct statement.

Explanation:

$\text{N}_3^-$ is named as azido. It is derived from HN3.

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Question 181 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The [Ni(en)3]Cl2 (en = ethylenediamine) has lower stability than [Ni(NH3)6]Cl2.
Reason: In [Ni(en)3]Cl2 the geometry of Ni is octahedral.
Answer
  1. Assertion is wrong statement but reason is correct statement.

Explanation:

[Ni(en)3]Cl2 is a chelating compound and chelated complexes are more stable than similar complexes with unidentate ligands as dissociation of the complex involves breaking of two bonds rather than one.

In [Ni(en)3]Cl2, Ni with d8 configuration shows octahedral geometry.

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Question 191 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: The second and third transition series elements have lesser tendency to fonn low spin complex as compared to the first transition series.
Reason: The CFSE $(\Delta_0)$ is more for 5d and 4d.
Answer
  1. Assertion is wrong statement but reason is correct statement.

Explanation:

4d and 5d elements have greater tendency to form low spin complex (allows better pairing of electrons) in comparison to 3d because the difference in energy of t2g and eg (CFSE, $\Delta_0$) increases in 4d and 5d.

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Question 201 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Ti(H2O)6]3+ is coloured while [Sc(H2O)6]3+ is colourless.
Reason: d - d transition is not possible in [Sc(H2O)6]3+.
Answer
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:

[Sc(H2O)6]3+ has no unpaired electron in its d subshell and thus d - d transition is not possible whereas [Ti(H2O)6]3+ has one unpaired electron in its d-subshell which gives rise to d - d transition to impart colour.

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Question 211 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: [Fe(CN)6]3- has d2sp3 type hybridisation.
Reason: [Fe(CN)6]3- ion shows magnetic moment corresponding to two unpaired electrons.
Answer
  1. Assertion is correct statement but reason is wrong statement.

Explanation:

[Fe(CN)6]3- ion shows magnetic moment corresponding to one unpaired electron.

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Question 221 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
Assertion: Aqueous solution of potassium ferrocyanide does not give the test of iron (II).
Reason: Potassium ferrocyanide is not poisonous like potassium cyanide.
Answer
  1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Explanation:

Being a complex salt, potassium ferrocyanide ionises to 4K+ and [Fe(CN)6]4- ions. Absence of Fe (II) does not give the test of iron.

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