Advertisements
Advertisements
प्रश्न
Which one of the following ions is coloured?
पर्याय
Se3+
Ti4+
Zn2+
V2+
Advertisements
उत्तर
V2+
Explanation:
The V2+ ion has an unpaired electron while the others have paired electrons.
So, `sqrt(2+)` is a coloured ion.
APPEARS IN
संबंधित प्रश्न
ln which pair highest oxidation states of transition metals are found:
Give reasons:
Transition metals show variable oxidation states.
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.
Write the factors which are related to the colour of transition metal ions.
NF3 is possible, but NF5 is not. Why?
Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
in basic medium.
Give reasons:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.
Account for the following :
Ti4+ is colourless whereas V4+ is coloured in an aqueous solutions.
Maximum oxidation state is shown by ____________.
Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
When acidified \[\ce{K2Cr2O7}\] solution is added to \[\ce{Sn^{2+}}\] salts then \[\ce{Sn^{2+}}\] changes to ______.
Which of the following will not act as oxidising agents?
(i) \[\ce{CrO3}\]
(ii) \[\ce{MoO3}\]
(iii) \[\ce{WO3}\]
(iv) \[\ce{CrO^{2-}4}\]
Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
EΘ of Cu is + 0.34V while that of Zn is – 0.76V. Explain.
Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.
Why are fluorides of transition metals more stable in their higher oxidation state as compared to the lower oxidation state?
The element with atomic number 53 belongs to
Which of the following is non-metallic?
The orientation of an atomic orbital is governed by
Which does not belong to first transition series?
Photographic film and plates have - au essential ingredient of
Why is the `"E"_(("V"^(3+)//"V"^(2+)))^"o"` value for vanadium comparatively low?
Why Zn, Cd and Hg are not called transition metals?
Complete the following reaction and justify that it is a disproportionation reaction:
\[\ce{3MnO^{2-}4 + 4H^+ -> \underline{}\underline{}\underline{}\underline{} + \underline{}\underline{}\underline{}\underline{} + 2H2O}\]
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
Explain the magnetic properties of d-block (or transition) elements.
Explain the use of different transition metals as catalysts.
A coordination compound has the formula \[\ce{CoCl3.4NH3}\]. It precipitates silver ions as AgCl and its molar conductance corresponds to a total of two ions.
Based on this information, answer the following question:
- Deduce the structural formula of the complex compound.
- Write the IUPAC name of the complex compound.
- Draw the geometrical isomers of the complex compound.
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Oxidation states
