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प्रश्न
NF3 is possible, but NF5 is not. Why?
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उत्तर
According to the electronic configuration of nitrogen, it does not have 3d orbital that's why it can't expand the valency up to 5 and does not form .
N does not have vacant d orbitals. Hence, there is no excitation of ns2 electron to vacant orbitals. Thus, has only three unpaired electrons in p-orbitals showing +3 oxidation state and not +5 in halides like other elements of group.
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संबंधित प्रश्न
ln which pair highest oxidation states of transition metals are found:
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?
Which one of the following ions is coloured?
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number
Why do transition metal ions possess a great tendency to form complexes?
Explain why Zn2+ salts are white whereas Cu2+ salts are coloured.
Maximum oxidation state is shown by ____________.
Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid-state?
Why does copper not replace hydrogen from acids?
Explain why does colour of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.
The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why?
EΘ of Cu is + 0.34V while that of Zn is – 0.76V. Explain.
Match the properties given in Column I with the metals given in Column II.
| Column I (Property) | Column II (Metal) | |
| (i) | Element with highest second ionisation enthalpy |
(a) \[\ce{Co}\] |
| (ii) | Element with highest third ionisation enthalpy |
(b) \[\ce{Cr}\] |
| (iii) | \[\ce{M}\] in \[\ce{M(CO)6}\] is | (c) \[\ce{Cu}\] |
| (iv) | Element with highest heat of atomisation |
(d) \[\ce{Zn}\] |
| (e) \[\ce{Ni}\] |
Identify the metal and justify your answer.
\[\ce{MO3F}\]
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.
On strong heating AgNO3, the gases evolved are:-
The product of oxidation of I– with \[\ce{MnO^{-}4}\] in alkaline medium is:-
Why are all copper halides known except that copper iodide?
Account for the following:
Transition metals form alloys.
How is the variability in oxidation states of transition metals different from that of p-block elements?
The disproportionation of \[\ce{MnO^{2-}_4}\] in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment (µ) value of B in BM is ______. (Nearest integer)
Account for the following:
Ce4+ is a strong oxidising agent.
Which one among the following metals of the 3d series has the lowest melting point?
A pair of coloured ions is ______.
The compounds of \[\ce{Ti^4+}\] ions are colourless due to ______.
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.
‘Spin only’ magnetic moment is the same for which of the following ions?
- Ti3+
- Cr2+
- Mn2+
- Fe2+
- Sc3+
Choose the most appropriate answer from the options given below:
