d Block Metals II

Here are some electron configurations:

1) Cu = [Ar] 3d⁹4s²

2) Cr = [Ar] 3d⁵4s¹

3) Mn²⁺ = [Ar] 3d⁵

Which ones are correct?

• 1 and 3 only

• 2 only

• 2 and 3 only

• 1, 2 and 3

Aqueous Fe³⁺ ions are reacted with an excess of aqueous sodium hydroxide. What is the product formed ?

• [Fe(OH)₆]^3-

• Fe(OH)₃(H₂O)₃

• [Fe(OH)₄(H₂O)₂]^-

• [Fe(OH)₄]^3-

VO₂⁺ ions can be reduced to V²⁺ ions using zinc metal in aqueous solution. In addition to VO₂⁺, how many coloured ions containing vanadium are produce over the course of the reduction reactions?

• one

• two

• three

• four

Which of the following is the electron configuration of a d-Block element?

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵

• 1s²2s²2p⁶3s²3p⁶3d⁸4s²

• 1s²2s²2p⁶3s²3p⁶

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s¹

Which of the following compounds contains elements from each of the s, p and d blocks of the periodic table?

• KAl(SO₄)₂

• CuCrO₄

• KMnO₄

• Na₂B₄O₇

Cu²⁺ ions can form a complex ion with Cl^- ions and also with NH₃.

These complex ions have

• different shapes but the same colour

• different shapes and different colours

• the same shape and the same colour

• the same shape but a different colour

Cr³⁺ ions form a complex ion with both ammonia and with hydroxide ions. These complex ions have:

• a different charge but the same coordination number

• a different charge and a different coordination number

• the same charge and the same coordination number

• the same charge but a different coordination number

[Cr(NH₂CH₂CH₂NH₂)₃]³⁺ is a complex ion which forms optical isomers.

Which of the following statements is/are true?

1: NH₂CH₂CH₂NH₂ is a bidentate ligand

2: The complex has an octahedral shape

3: The terms cis and trans are used to describe the optical

isomers

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 1 only

What is the overall charge on the complex ion hexacyanoferrate(II) ?

• 2+

• 3-

• 4-

• 1-

Which of these is the correct name of the catalyst for the oxidation of sulphur dioxide in the Contact Process?

• vanadium oxide

• vanadium pentoxide

• divanadium oxide

• iron