Chemistry

This is a Long Answer Type Questions as classified in NCERT Exemplar

Ans:

Fehling's test is positive when compound 'B' is used. It gives an iodoform test and proves that it is an aldehyde. Because it fails Fehling's test, compound 'C' is a ketone.

According to the de Broglie equation, the particles like electrons have wave-like properties. The quantum mechanical model foundation is laid by this concept and it also explains the stability of electron orbits using wave behavior.

The hydrogen atom can be accurately explained by Bohr's model. However, it does not account for shielding effects, electron-electron interactions, and the wave nature of electrons for multi-electron atoms.

Quantum numbers describe the unique position and energy of an electron in an atom. These are a set of four numbers and are important for predicting chemical behavior and understanding the distribution of electrons in orbitals.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: D

[Fe (CN)₆]^3-  ion shows magnetic moment corresponding to one unpaired electron. (CN) is a ligand with a strong field that couples electrons, resulting in hybridisation. d²sp³ and it has one unpaired electron, it has the magnetic moment of one paired electron.

  μ= $\sqrt[]{n(n+2}$   = 1 (1 + 2)

   = 3 = 1.73BM 

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: B

From the Cis and Trans forms, geometrical isomerism forms compounds. All of the valences in the MX₆ ligand are the same, resulting in an identical molecule. L is a distinct ligand in MX₅L, and it can be replaced with any other valency in the structure to create an identical molecule; the molecule does not change. Because of the presence of symmetry, which is an essential prerequisite for revealing geometrical isomerism, complexes do not show geometrical isomerism.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: A

The term "linkage isomerism" refers to two molecules that have similar ligands but differ in the donating site of the ligand. Ambidentate is made up of two different types of donor atoms.

Example [Fe (NO₂) (H₂O)₅]Cl₂. NO₂ is Ambidentate ligand as Nand O₂ are donors.

 As a result, linkage isomerism occurs in coordinations with ambidentate ligands. Reason and Assertion are both correct.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: B

[Cr (H₂O)₆]Cl₂ and [Fe (H₂O)₆]Cl₂ 

Due to the creation of a more stable complex ion after obtaining ion, [Cr (H₂O)₆]Cl₂ and [Fe (H₂O)₆]Cl₂ are reduced in nature. Both compounds have a coordination of 6 and so form an octahedral complex. The hybridisation state of is 3 and the oxidation state of is 2+. Hybridization is 3d⁴ and 3d⁶ is 2+. Both compounds have unpaired electrons and have weak field ligands. In both compounds, removing electrons is simple.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: A

Toxic metal ions are removed by the chelating ligands. Chelate complexes tend to be more stable. When a solution of the chelating ligand is added to a solution containing toxic metals ligands chelates the metal ions by the formation of a stable complex.

Thus, EDT A (hexadentate ligand) forms a stable metal chelate and is used to remove toxic metal ions.

Both Assertion and Reason are correct and Reason is the correct  for Assertion.

Hence, option A is correct.

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: Correct option: (i)