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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

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.

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प्रश्न

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.

दीर्घउत्तर
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उत्तर

Compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals are called interstitial compounds.

Properties of such compounds are:

(i) High melting points higher than those of pure metals.

(ii) These compounds are very hard.

(iii) They retain metallic conductivity.

(iv) They are chemically inert.

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११५]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 69 | पृष्ठ ११५

संबंधित प्रश्‍न

How would you account for the following? 

Transition metals exhibit variable oxidation states.

 


The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co

Answer the following: Which element has the highest m.p?


How would you account for the following: Transition metals form complex compounds.


Account for the following:

Zn is not considered as a transition element.


Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?


How would you account for the following:

The d1 configuration is very unstable in ions.


Which one of the following ions is coloured?


NF3 is possible, but NF5 is not. Why?


Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)


Identify the metal and justify your answer.

Carbonyl \[\ce{M(CO)5}\]


On the basis of the figure given below, answer the following questions:

  1. Why Manganese has lower melting point than Chromium?
  2. Why do transition metals of 3d series have lower melting points as compared to 4d series?
  3. In the third transition series, identify and name the metal with the highest melting point.

Which of the following transition metal is not coloured?


Give reasons for the following statement:

Zn, Cd, and Hg are soft metals.


Account for the following:

Transition metals form alloys.


Account for the following:

Ce4+ is a strong oxidising agent.


Assertion (A): Transition metals have high enthalpy of atomisation.

Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.


Which of the following transition metals shows +1 and +2 oxidation states?


Give a reason for the following.

Some transition metals and their compounds get attracted towards the magnetic field.


Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H2S.


Match List-I with List-II.

List-I List-II
A. Haber process I. Fe catalyst
B. Wacker oxidation II. PdCl2
C. Wilkinson catalyst III. [(PPh3)3RhCl]
D. Ziegler catalyst IV. TiCl4 with Al(CH3)3

Choose the correct answer from the options given below:


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