Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.

Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.

The correct order of increasing oxidizing power in the series _______.

The alloy of copper that contain Zinc is________.

Which of the following does not give oxygen on heating?

Which of the following statements is not true?

Permanganate ion changes to ________ in acidic medium.

Which one of the following statements related to lanthanons is incorrect?

Which of the following lanthanoid ions is diamagnetic?

Hybridisation of chromium ions and dichromate ions is ________.

Which one of the following exhibits highest oxidation state?

Which of the following statement is correct for 3d-transition element?

Except ________ all element from Rf to Cn, are synthetically prepared and have very low half life periods.

A mixture of TiCl₄ and trialkyl aluminium is _________

What are transition metals? Give four examples.

Justify the position of lanthanoids and actinoids in the periodic table.

Why Gd³⁺ is colourles?

Complete the following.
a. 3MnO₄^2- + 4H⁺ ⟶?
b. C₆H₅CH₃ \(\overset { acidified }{ \underset { KMnO_{ 4 } }{ \longrightarrow } } \)?
c. MnO₄^- + Fe²⁺ ⟶?
d. KMnO₄ \(\overset { \triangle }{ \underset { Red\ hot }{ \longrightarrow } } \) ?
e. Cr₂O₇^2- + 6I^- + 14H⁺ ⟶?
f. Na₂Cr₂O₇ + 2KCl ⟶?

What are coinage metals?

Which is the most common oxidation state of lanthanoides?

Calculate the magnetic moment of Fe³⁺ ion (Atomic no. of Fe = 26)

Arrange the following in increasing order of acidic character?
CrO₃, CrO, Cr₂O₃

What is an alloy? Give an example.

What are the conditions for alloy formation?

Complete the following equations.
(i) Cr₂O₇^2- + 2OH^- ⟶
(ii) MnO₄^- + 4H⁺ + 3e^- ⟶

Account for the following:
(i) Cobalt (II) is stable in aqueous solution but in the presence of complexing reagents, it is easily oxidised.
(ii) The d¹ configuration is very unstable in ions.

Give reason for the following:
(i) A transition metal exhibits highest oxidation state in oxides and fluorides.
(ii) Cu²⁺ is unstable in an aqueous solution.

Complete the following reactions?
i) Cr² + 2e^- ⟶
ii) Mn²⁺ + 2e^- ⟶
iii) Fe²⁺ + 2e^- ⟶
iv) CO²⁺ + 2e^- ⟶

Write the properties of interstitial compound.

What is chromyl chloride test? Give equations.

Explain the preparation of potassium permanganate from pyrolusite.

Explain the oxidising property of KMnO₄ in natural medium. Give the equations.

Why Hcl and HNO₃ cannot be used for making the KMnO₄ medium acidic?

Which is the last element in the series of the actinoids? Write the electronic configuration of this element comment on the possible oxidation state of this element.

Out of Lu(OH)₃ and La(OH)₃ which is more basic and why?

Which is stronger reducing agent Cr²⁺ or Fe²⁺?

Transition metals show high melting points. Why?

Justify the following statement.
"Elements of the first transition series possess many properties different from those of heavier transition elements".

Why is there a variation of atomic andionic size as we move from Sc to Zn?

How are materials classified based on their magnetic properties?

Complete the following reactions
(i) Cr₂O₇^2- ⟶
(ii) Cr₂O₇^2- + 6I^-+ 14H⁺ ⟶
(iii)  Cr₂O₇^2-+ 3S^2-+ 14H⁺ ⟶
(iv) Cr₂O₇^2- + 3SO₂ + 2H⁺ ⟶
(v) Cr₂O₇^2- + 3Sn²⁺ + 14H⁺ ⟶
(vi) K₂Cr₂O₇ + 8H₂SO₄ + 3CH₃CH₂OH ⟶
(vii) 2MnO₄^- + 5(COO)^2- + 6H⁺ ⟶
(viii) 2MnO₄^- + 10I^- + 16H⁺ ⟶
(ix) 2MnO₄^- + 5S^2-+ 16H⁺ ⟶
(x) 2MnO₄^- + 5NO₂^- + 6H⁺ ⟶
(xi) 2KMnO₄ + 3H₂SO₄ + 5CH₃CH₂OH ⟶
(xii) 2MnO₄^- + 5SO₃^2- + 6H⁺ ⟶