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प्रश्न
Why do interstitial compounds have higher melting points than corresponding pure metals?
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उत्तर
The melting points of interstitial compounds are higher than those of pure metals because of bonding between the metal and the non-metal, which is stronger than metal–metal bonding.
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संबंधित प्रश्न
What are interstitial compounds?
Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?
Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state?
In what way is the electronic configuration of the transition elements different from that of the non-transition elements?
How would you account for the following:
Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.
How would you account for the following:
Cobalt (II) is stable in aqueous solutions, but in the presence of complexing reagents, it is easily oxidised.
How would you account for the following:
The d1 configuration is very unstable in ions.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number
The paramagnetic character in the 3d-transition series elements increases up to Mn and then decreases.
Explain why Zn2+ salts are white whereas Cu2+ salts are coloured.
Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid-state?
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?
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of \[\ce{Cr^{3+}}\] ion is ______.
Why does copper not replace hydrogen from acids?
Assertion: Separation of \[\ce{Zr}\] and \[\ce{Hf}\] is difficult.
Reason: Because \[\ce{Zr}\] and \[\ce{Hf}\] lie in the same group of the periodic table.
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?
Which of the following ions will exhibit colour in aqueous solution?
Give reasons for the following statement:
Transition metals and most of their compounds show paramagnetic behaviour.
Give reasons for the following statement:
Zn, Cd, and Hg are soft metals.
The oxidation state of Fe in [Fe(CO)5] is ______.
Assertion (A): Transition metals show their highest oxidation state with oxygen.
Reason (R): The ability of oxygen to form multiple bonds to metals.
A transition element X has an electronic configuration [Ar]4s23d3. Predict its likely oxidation states.
Explain the magnetic properties of d-block (or transition) elements.
Explain the use of different transition metals as catalysts.
