Elements: Physical Properties

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Which property is NOT characteristic of transition metals?

Metallic lustre

Low density (correct)

High thermal conductivity

Malleability

What trend is observed in atomic radii of transition elements within a period?

Always increases

Increases continuously

Decreases till the middle and then becomes constant (correct)

Remains constant throughout

What factor contributes to the irregular trend in the first ionization enthalpy of 3d metals?

Metallic bonding

Lanthanoid contraction

Electronic configuration (correct)

Atomic radii

Which statement is true about the ionic radii of transition elements?

Ionic radii decrease with increase in oxidation state (C) Signup and view all the answers

What causes the regular lattice of positive ions in metallic bonding to be held together?

Cloud of free electrons (C) Signup and view all the answers

Which property explains the development of electrode potential in transition metals?

Enthalpy of atomisation (D) Signup and view all the answers

Why do transition elements exhibit variable oxidation states?

Since ns and (n–1) d electrons have similar energies (B) Signup and view all the answers

Which type of substances have paired electrons only?

Diamagnetic (A) Signup and view all the answers

What type of catalytic properties do iron, cobalt, nickel, platinum, chromium, and manganese exhibit?

They work as heterogeneous catalysts (A) Signup and view all the answers

Which property of transition elements causes the enthalpy of atomisation to first increase, reach a maximum, and then decrease regularly?

Variable oxidation state (B) Signup and view all the answers

How are the energies of ns and (n–1) d electrons related in transition elements?

The energies are exactly equal (D) Signup and view all the answers

What causes the irregular trend in the reduction potential values of transition metals?

Ionization enthalpies (A) Signup and view all the answers

Which type of substances have at least one unpaired electron and exhibit paramagnetism?

Paramagnetic substances (B) Signup and view all the answers

What characteristic of transition metals allows them to act as catalysts for various chemical reactions?

Multiple oxidation states (C) Signup and view all the answers

What happens to the atomic radii of transition elements as the atomic number increases within a period?

First decreases, then remains constant, and finally increases (C) Signup and view all the answers

How does the ionic radii of transition elements change with an increase in oxidation state?

Decreases (C) Signup and view all the answers

What trend is observed in density of transition elements from left to right within a period?

Increases (A) Signup and view all the answers

What is responsible for the irregular trend in the first ionisation enthalpy of 3d metals?

Irregularity in electronic configuration of 4s and 3d orbitals (A) Signup and view all the answers

In metallic bonding, transition metal atoms are held together by what?

A cloud of free electrons (C) Signup and view all the answers