WorksheetsINTRODUCTION TO TRANSITION ELEMENTS
Total questions: 15
Worksheet time: 9mins
From which orbitals are electrons lost in the formation of Cu2+ ion?
3p
3d
4s
3d and 4s
State whether the above ligand is monodentate, bidentate or polydentate?
monodentate
bidentate
polydentate
Which one of the following cannot act as a ligand?
NH3
CH3NH2
BF3
NCS-
Zinc is not a transition element because
it forms only Zn2+ ions.
it forms compounds with fully filled 3d subshells.
it does not exhibit catalytic properties.
the aqueous solution of Zn2+ is colourless.
Which of the following complex ion is formed when potassium cyanide is added to iron(II) solution?
[Fe(H2O)6]2+
[Fe(H2O)6]3+
[Fe(CN)6]3-
[Fe(CN)6]4-
Which of the following statements is/are true with regards to the complex compound, [Cu(NH3)4]SO4?
[Cu(NH3)4]SO4 solution is dark blue in colour.
1 mol of [Cu(NH3)4]SO4 reacts with two moles of silver nitrate.
1 mol of [Cu(NH3)4]SO4 in aqueous solution gives 2 mol of ions.
Which element forms the complex ion [XCl4]-
Chromiun
Copper
Lead
Silicon
Which of the following statements with regards to [Fe(CN)6]4- is/are true ?
The oxidation state of iron in the complex ion is +2.
The coordiination number of iron is 6.
The complex ion is unstable in water.
A transition metal M forms a cyanide complex ion [M(CN)6]4-. If the cyanide ligands are replaced by ammonia, the complex ion is converted to [M(NH3)4]x. What is the value of x?
2-
3-
2+
3+
What is the coordination number of the complex [Co(NH3)4Cl2]Cl?
2
3
4
6
The anti-cancer drug cisplatin has the formula [Pt(NH3)2]Cl2. In the human body, one of the chloride ions of cisplatin is replaced by one water molecule.
[Pt(NH3)2]Cl2+H2O ---> [Pt(NH3)2Cl]+ + Cl-
What is the oxidation number of Pt in cisplatin and in the aquacomplex.
+2 and +1 respectively
+2 and +2 respectively
+4 and +3 respectively
+4 and +4 respectively
When drops of NH3 (aq) are added to Cu(NO3)2 (aq), a pale blue precipitate is formed. This precipitate dissolves when an excess of NH3 (aq) is added, forming a deep blue solution. Which process does not occur in this sequence?
coordinate bond formation
formation of a complex ion
precipitation of copper(II) hydroxide
reduction of Cu2+ ions
Most of the transition elements and their compounds are heterogeneous catalysts which are useful for various reactions. The transition elements possess this catalytic power because they
can form complexes
can act as reducing agents
have a good adsorption characteristic
can alter their oxidation number
M is an element having the following electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d3 4s2
Which statement is not true of M?
It forms an oxoanion of formula MO42-.
It forms a stable complex of formula [M(H2O)6]2+
It forms coloured oxides.
Its ion can act as a homogeneous catalyst.
Transition metals and their compounds are used as catalyst in industry. Among pairs of industrial processes and catalysts below, which one is correct?
Contact process - Cu
Manufacture of nitric acid - V2O5
Oxidation of ethanol to ethanal - Pt
Haber process - Fe
