HSC Science इयत्ता १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

What are transition metals? Give four examples.

Complete the following.

\[\ce{MnO^2-_4 + H^+ ->?}\]

What are interstitial compounds?

Calculate the number of unpaired electrons in Ti³⁺, Mn²⁺ and calculate the spin only magnetic moment.

Explain briefly how +2 states become more and more stable in the first half of the first-row transition elements with increasing atomic numbers.

Explain the variation in `"E"_ ("M"^(3+)//"M"^(2+))^0` 3d series.

Compare the ionization enthalpies of the first series of the transition elements.

The `"E"_("M"^(2+)//"M")^0` value for copper is positive. Suggest a possible reason for this.

Describe the variable oxidation state of 3d series elements.

Which metal in the 3d series exhibits +1 oxidation state most frequently and why?

Why first ionization enthalpy of chromium is lower than that of zinc?

Transition metals show high melting points why?

Oxidation state of Iron and the charge on the ligand NO in [Fe(H₂O)₅NO]SO₄ are ____________.

In which of the following coordination entities the magnitude of Δ₀ will be maximum?

Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds.

Based on VB theory explain why \[\ce{[Cr(NH3)6]^3+}\] is paramagnetic, while \[\ce{[Ni(CN)4]^2-}\] is diamagnetic.

[Ti(H₂O)₆]³⁺ is coloured, while [Sc(H₂O)₆]³⁺ is colourless – explain.

Classify the following ligand based on the number of donor atoms.

NH₃

Classify the following ligand based on the number of donor atoms.

en

Classify the following ligand based on the number of donor atoms.

ox²⁻