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 _______.

Which of the following statements is not true?

MnO₄^- react with Br^- in alkaline P^H to give ________.

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

The most common oxidation state of actinoids is _______.

Most of the transition metal ions are coloured, because of the ________.

Which one of the following exhibits highest oxidation state?

Which of the following is not coloured?

Value of magnetic moment of a divalent metal ion is, 5.92 BM. Total number of electron in its atom would be _______.

In black and white photography, the developed film is fixed by washing with ______.

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

The electronic configuration of Sc is ______.

Of these statement, which statement is incorrect in most of the transition elements are _______.

What are transition metals? Give four examples.

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

Explain why compounds of Cu²⁺ are coloured but those of Zn²+ are colourless.

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 ⟶?

Write the electronic configuration of the element with atomic number 102.

Why lanthanoids are called f block elements?

Comparing La(OH)₃ and Lu(OH)₃, which is more basic and explain why?

Orange colour of Cr₂O₇^2- ion charges to yellow in alkali and yellow solution turns out orange on adding H⁺ ions. Explain why?

What is an alloy? Give an example.

Write the equation for the action of heat on KMnO₄

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

Explain the variation in E⁰_{M³⁺/M²⁺}  3d series.

Compare lanthanoids and actinoids.

Actinoid contraction is greater from element to element than the lanthanoid contraction, why?

Discuss the general characteristic of the 3d series of the transition elements with special reference to their
(i) Atomic size
(ii) Enthalpies of atomisation

Explain why oxidation states of transition elements increases first from Sc to Mn and then decrease?

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.

What are redox reactions?

What is chromyl chloride test? Give equations.

Give three uses of KMnO₄

Which is stronger reducing agent Cr²⁺ or Fe²⁺?

Describe the variable oxidation state of 3d series elements.

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

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".

Write a note on the ionization enthalpy of transition elements.

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⁺ ⟶