Multiple Choice QuestionsIdentify the metal that forms colourless compounds.
Iron (Z = 26)
Chromium (Z = 24)
Vanadium (Z=23)
Scandium (Z =21)
Consider the following statements.
I. La(OH)3 is the least basic among hydroxides of lanthanides.
II. Zr4+ and Hf4+ possess almost the same ionic radii.
III. Ce4+ can act as an oxidising agent.
Which of the above is/are true?
I and III
II and III
II only
I and II
Pick out the correct statement(s).
1. Manganese exhibits +7 oxidation state
2. Zinc forms coloured ions
3. [CoF6]3- is diamagnetic
4. Sc forms +4 oxidation state
5. Zn exhibits only +2 oxidation state
1 and 2
1 and 5
2 and 4
3 and 4
Pick out the correct statements from the following
1.Cobalt (III) is more stable in octahedral complexes.
2. Zinc forms coloured ions or complexes.
3. Most of the d-block elements and their compounds are ferromagnetic.
4. Osmium shows (VIII) oxidation state.
5. Cobalt (II) is more stable in octahedral complex.
1 and 2
1 and 3
2 and 4
1 and 4
Which of the following statements is not correct?
The complexes [NiCl4]2- and [Ni(CN)4]2- differ in the state of hybridization of nickel
The complexes [NiCl4]2- and [Ni(CN)4]2- differ in the magnetic properties
The complexes [NiCl4]2- and [Ni(CN)4]2- differ in geometry
The complexes [NiCl4]2- and [Ni(CN)4]2- differ in primary valencies of nickel
D.
The complexes [NiCl4]2- and [Ni(CN)4]2- differ in primary valencies of nickel
The primary valencies of Ni, in the complexes [Ni(Cl4)]2- and [Ni(CN4)]2- is same, i.e., (+II).
Primary valencies are those valencies in which a metal exhibits in the formation of its simple salt, these are non directional. It is also referred as oxidation state of central metal atom.
Which one of the following pairs of elements is called 'chemical twins' because of their very similar chemical properties ?
Mn and W
Mo and Tc
Fe and Re
Hf and Zr
Potassium permanganate acts as an oxidant in alkaline and acidic media. The final products formed from KMnO4 in the two conditions are respectively
MnO2- and Mn3+
Mn3+ and Mn2+
Mn2+ and Mn3+
MnO2 and Mn2+
The catalytic activity of the transition metals and their compounds is described to :
their chemical reactivity
their magnetic behaviour
their unfilled d-orbitals
their ability to adopt multiple oxidation states and their complexing ability
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