Quiz 3 Transition Elements

Which of the following statements that compare two d-block elements is correct?

• Vanadium is denser than copper but has a smaller atomic radius.

• Vanadium is denser than copper and has a larger atomic radius.

• Vanadium is less dense than copper and has a smaller atomic radius.

• Vanadium is less dense than copper but has a larger atomic radius.

The magnetic moment of Chromium in CrO

• 2

• 3

• 4

• 5

The value of heat change is

• -200

• 100

• 200

• 800

In the following reaction FeCl₂→FeCl₃ the color change from ....... to .........

• Yellow to Green

• Green to Yellow

• Yellow to Red

• Red to Yellow

A + B ⇌ C ∆H= 400 Kj / mol The activation energy for the backward reaction is 100 kJ / mol. What is the activation energy for the forward reaction ?

• 100 kj/mol

• 300 kj/mol

• 400 kj/mol

• 500 kj/mol

Which of the following is the most stable, colored and paramagnetic substance?

• ZnCl₂

• FeCl₂

• MnCl₂

• V₂O₅

In Co³⁺ there are ....... unpaired electrons

• 1

• 3

• 4

• 5

In the compound VPO₄ the electronic configuration of the Vanadium ion is ......

• [Ar] 3d⁴

• [Ar] 3d²

• [Ar] 3d¹ 4s⁰

• [Ar] 3d³ 4s²

All the following elements form with oxygen , compound with chemical formula XO except ……

• Fe

• Zn

• Sc

• Cd

which of the following solutions (A,B or C) is zinc chloride

• A

• B

• C