WorksheetsSTPM Chemistry (Transition Elements)
Total questions: 15
Worksheet time: 9mins
Which of the following d-block elements is not a transition element?
Iron
Zinc
Titanium
Chromium
The first row of d-block elements has how many transition elements?
11
10
9
8
Which of the following are true about transition elements?
Form coloured ions or compounds
Show catalytic properties
Appear as shiny grey solid
Could form at least one stable simple ion with partially filled d-orbitals.
Suggest one transition element with proton number in between 20 to 26 by using chemical formula.
(a)
What is the highest oxidation state of manganese in it's compounds?
+8
+7
+6
+5
Most of the transition elements and their compounds are heterogeneous catalysts which are useful for various reactions. The transition elements possess the catalytic power because they
have a good adsorption characteristic
can alter their oxidation number
can act as reducing agents
can form complexes
Which of the following best explains the action of a transition element as homogeneous catalyst?
It decreases the enthalpy of reaction
It exhibits a variable oxidation states
It supplies energy to increase the rate of effective collision
It supplies electrons to facilitate adsorption through the formation of temporary bonds
A solution of [Cr(H2O)6]3+ ion is violet while the solution of [Cr(OH)4(H2O)2]- ion is grey-green. This is due to the difference in
oxidation state
ligand
charge
counter ion
The chemical formula of a compound is [CoCl(NH3)5]SO4. What is the IUPAC name of the compound?
Pentaamminechlorocobalt(II) sulphate
Chloropentaamminecobalt(II) sulphate
Chloropentaamminecobalt(III) sulphate
Pentaamminechlorocobalt(III) sulphate
Tris(ethylenediamine)cobalt(III) chloride is a coordination complex. Which is true about the complex?
Its structural formula is [Co(en)3]Cl2
It forms two ions in aqueous solution
It is a square planar complex
Its ligand is bidentate
Zn2+ ions form a white precipitate, Zn(OH)2, with an aqueous solution of ammonia. The white precipitate dissolves when a NH4Cl solution is added to it. Which statement explains the observation?
NH4+ ions decrease the concentration of OH- ions in the solution
NH4+ ions increase the solubility product of Zn(OH)2
NH3 molecule is a stronger ligand than OH- ions
A soluble ZnCl2 compound is formed
Which of the following statements is true of complex ion [Fe(C2O4)3]3- ?
An ethanedioate ion is a bidentate ligand
The oxidation state of iron in this complex ion is +2
This complex ion is called tris(oxalato)ferrate(III) ion
This complex ion is called tris(ethanedioato)ferrate(III) ion
The element X has a proton number of 25. Which of the following statements is/are true of X?
The metal X has a high density
X forms coloured complex ions
The highest oxidation number of X in its ion is +7
X is a suitable material used to build aircraft jet engines because it has a low density and high resistance to corrosion. X is
carbon fibre
chromium
titanium
tin
Which statement is true of tris(ethanedioato)cuprate(II) ion?
The ligand is monodentate
Cu2+ ion uses empty 3d orbital
The metal ion acts as a Lewis base
The charge of the complex ion is 4-
