Why do transition metals have high enthalpy of atomization ?

Why do transition metals have high enthalpy of atomization ?
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 Ans : it is due to strong metallic bonds and additional covalent bonds 
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Explain the following , giving reason . (a) Transition metal and many of their compounds show paramagnetic behavior (b) The enthalpy of atomisation of the transition metal is high . (c) The Transition metal generally form coloured compounds .

Description : Explain the following , giving reason . (a) Transition metal and many of their compounds show paramagnetic behavior (b) The enthalpy of atomisation of the transition metal is high . (c) The Transition metal generally form coloured compounds . 

Last Answer : Ans(a) It is due to unpaired electrons . (b) It is due to strong metallic bond and additional Covalent bonds due to presence of unpaired electron in d- orbitals (c) It is due to presence of unpaired electrons ,they undergo d-d transition . 

Why are Ti+2 and other transition metals and their ions paramagnetic ?

Description : Why are Ti+2 and other transition metals and their ions paramagnetic ?

Last Answer :  Ans: These ions have unpaired electrons in d- subshell. 

Why do transition metals have higher I.E than s –block elements ?

Description : Why do transition metals have higher I.E than s –block elements ?

Last Answer : Ans: It is due to smaller atomic size than s-block elements , effective nuclear charge is more , terefore I.E is high.

Why are transition metals and there compounds generally coloured ?

Description : Why are transition metals and there compounds generally coloured ?

Last Answer : Ans It is due to present of unpaired electrons in transition metals and their ions , that is why they absorbed light from visible region and undergoes d-d transition and radiate complementary colour . 

Why are Zn , Cd , Hg are not regarded as transition metals ?

Description : Why are Zn , Cd , Hg are not regarded as transition metals ? 

Last Answer : Ans: It is because neither they nor their ions have incompletely filled d- orbitals . 

Why are transition metal fluorides are ionic in nature where as chlorides and bromides are covalent in nature .

Description : Why are transition metal fluorides are ionic in nature where as chlorides and bromides are covalent in nature . 

Last Answer : Ans - It is because of fluorine is most electronegative where as Cl and Br are less electro negative . Greater the difference in electro negativity more will be ionic character .

Why is K2Cr2O7 generally preferred over Na2Cr2O7 in a volumetric analysis .Give reason .

Description : Why is K2Cr2O7 generally preferred over Na2Cr2O7 in a volumetric analysis .Give reason .

Last Answer : Ans : It is because Na2Cr2O7 is hygroscopic in nature that is why it absorbs moisture from atmosphere , therefore its standard solution can not be prepared .

Why are lanthanoid colored and paramagnetic L

Description : Why are lanthanoid colored and paramagnetic L

Last Answer : Ans It is due to presence of unpaired electrons, they are paramagnetic and they absorb light From visible region and undergoes f-f transition and radiate complementary colour . 

Why Mn+2 is more stable than Mn+3 but Fe +3 is more stable than Fe+2 ?

Description : Why Mn+2 is more stable than Mn+3 but Fe +3 is more stable than Fe+2 ?

Last Answer : Ans Mn+2 has half filled d- orbital ,therefore it is more stable than Mn+3 Fe+3 has half filled d- orbital, therefore it is more stable than Fe +2 . 

Why is Cu+1 diamagnetic and Cu +2 paramagnetic ?

Description : Why is Cu+1 diamagnetic and Cu +2 paramagnetic ?

Last Answer : It is because Cu+ does not have unpaired electrons where as Cu+2 has unpaired electrons in d-sub cell . 

Why do Zr and Hf show similar properties ?

Description : Why do Zr and Hf show similar properties ?

Last Answer :  Ans It is due to similar ionic size which due to lanthanide contraction . 

Why are Cr+ , Ag+ & Sc+3 Colour less ?

Description : Why are Cr+ , Ag+ & Sc+3 Colour less ? 

Last Answer : Ans It is because they do not have unpaired electrons ,therefore can not under goes d-d transition .

Why does V2O5 acts as catalyst ?

Description : Why does V2O5 acts as catalyst ?

Last Answer : Ans : It is because V shows variable O.S . 

What is an lanthanoid contraction ? What is its cause ? Give its consequences .

Description : What is an lanthanoid contraction ? What is its cause ? Give its consequences .

Last Answer : Ans The decrease in atomic and ionic size with increase in atomic no. in lanthanoid series is called lanthanoid contraction . The cause of lanthanoid contraction is poor shielding effect of d and f ... is close resemblance between elements of 4 d and 5 d transition series . due to similar ionic 

Why Ce+3 Can be easily Oxidised to Ce+4 ?

Description : Why Ce+3 Can be easily Oxidised to Ce+4 ?

Last Answer : Ans : It is because Ce+4 has stable electronic configuration . 

What is the highest oxidation state shown by Cr. (24) , Mn(25) ?

Description : What is the highest oxidation state shown by Cr. (24) , Mn(25) ?

Last Answer : Ans: Cr. Shows (+6) and Mn Shows (+7) Oxidation state .  

What are d Block Elements ?

Description : What are d Block Elements ? 

Last Answer : Ans: Those elements in which d-orbital are progressively filled up are known as d-orbital.

Application of d- & f- block elements

Description : Application of d- & f- block elements

Last Answer : Application of d- & f- block elements:- 1. Iron and steel used in construction,as catalyst in Haber's process 2. CrO2 is used in magnetic tapes 3. Ni is in hydrogenation 4. W ( ... in contact process 9. Titanium is in nuclear reactions. 10. PdCl2 is in Wacker's process.

How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals

Description : How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals

Last Answer : Ans The hydration enthalpies of alkaline earth metal ions decrease with increase in ionic size down the group. Be2+> Mg2+ > Ca2+ > Sr2+ > Ba2+ The hydration enthalpies of alkaline earth metal ions ... MgCl2 and CaCl2 exist as MgCl2.6H2O and CaCl2· 6H2O while NaCl and KCl do not form such hydrates.

How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals

Description : How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals

Last Answer : Ans The alkaline earth metals have low ionization enthalpies due to fairly large size of the atoms. Since the atomic size increases down the group, their ionization enthalpy decreases The first ... enthalpies of the alkaline earth metals are smaller than those of the corresponding alkali metals.

How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals

Description : How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals  

Last Answer : The hydration enthalpies of alkaline earth metal ions decrease with increase in ionic size down the group. Be2+> Mg2+ > Ca2+ > Sr2+ > Ba2+ The hydration enthalpies of alkaline earth metal ... and CaCl2 exist as MgCl2.6H2O and CaCl2· 6H2O while NaCl and KCl do not form such hydrates.  

How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals

Description : How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals 

Last Answer : The alkaline earth metals have low ionization enthalpies due to fairly large size of the atoms. Since the atomic size increases down the group, their ionization enthalpy decreases The first ionisation ... of the alkaline earth metals are smaller than those of the corresponding alkali metals.  

How the ionization enthalpy varies in alkali metals

Description : How the ionization enthalpy varies in alkali metals 

Last Answer : Ionization enthalpy decrease down the group from Li to Cs. 

The process of breaking up or liquid into fine droplets by spraying is A. vaporization B. atomization C. condensation D. evaporation

Description : The process of breaking up or liquid into fine droplets by spraying is A. vaporization B. atomization C. condensation D. evaporation

Last Answer : ANSWER : B

The process of breaking up a liquid into fine droplets by spraying is called a. vaporization b. carburetion c. injection d. atomization

Description : The process of breaking up a liquid into fine droplets by spraying is called a. vaporization b. carburetion c. injection d. atomization

Last Answer : ANSWER d. atomization

.In Hydraulic sprayers, the degree of atomization is primarily a function of A. Liquid pressure and the nozzle characteristics B. Air velocity C. Size of the nozzle D. Size and shape of the atomizer

Description : .In Hydraulic sprayers, the degree of atomization is primarily a function of A. Liquid pressure and the nozzle characteristics B. Air velocity C. Size of the nozzle D. Size and shape of the atomizer

Last Answer : A. Liquid pressure and the nozzle characteristics

Atomization of spray fluid can achieved by : A. discharging the liquid through an orifice under pressure B. by breaking up the jet of liquid by a blast of _____ C. both A & B D. none

Description : Atomization of spray fluid can achieved by : A. discharging the liquid through an orifice under pressure B. by breaking up the jet of liquid by a blast of _____ C. both A & B D. none

Last Answer : C. both A & B

Explain the following : (i) Low spin octahedral complexes of nickel are not known. (ii) The π-complexes are known for transition elements only. (iii) CO is a stronger ligand than NTL, for many metals. -Chemistry

Description : Explain the following : (i) Low spin octahedral complexes of nickel are not known. (ii) The π-complexes are known for transition elements only. (iii) CO is a stronger ligand than NTL, for many metals. -Chemistry

Last Answer : (i) The electronic configuration of Ni is [Ar] 3d8 4s2 which shows that it can only form two types of complexes i.e. square planar (dsp2) in presence of strong ligand and tetrahedral (sp3) in ... more splitting of d-orbitals and moreover it is also able to form π bond due to back bonding.

What are transition elements? (1) Elements whose two outermost shells are incomplete (2) Elements which possess properties of both, metals and non-metals (3) They have eight electrons in the outermost shell (4) Elements whose three outermost shells are incomplete

Description : What are transition elements? (1) Elements whose two outermost shells are incomplete (2) Elements which possess properties of both, metals and non-metals (3) They have eight electrons in the outermost shell (4) Elements whose three outermost shells are incomplete

Last Answer : (1) Elements whose two outermost shells are incomplete

Catalytic converters are generally made from (1) Alkaline metals (2) Hydrogen (3) Transition metals (4) Carbon

Description : Catalytic converters are generally made from (1) Alkaline metals (2) Hydrogen (3) Transition metals (4) Carbon

Last Answer : (3) Transition metals Explanation: Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as ... nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.

Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electronegativity (3) Low ionization energy (4) Malleability

Description : Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electronegativity (3) Low ionization energy (4) Malleability

Last Answer : (1) Tendency to gain electrons Explanation: The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ... ions, the 4s electrons are always lost first; so, they form only cations (positive ions).

The catalytic activity of transition metals and their compounds is ascribed mainly to (1) their chemical reactivity (2) their magnetic behaviour (3) their unfilled d-orbitals (4) their ability to adopt variable oxidation states

Description : The catalytic activity of transition metals and their compounds is ascribed mainly to (1) their chemical reactivity (2) their magnetic behaviour (3) their unfilled d-orbitals (4) their ability to adopt variable oxidation states

Last Answer : (4) their ability to adopt variable oxidation states

The elements that have an outer electron configuration ns2 (read: n - s - 2) are called: w) halogens x) transition metals y) alkaline earths z) noble gases

Description : The elements that have an outer electron configuration ns2 (read: n - s - 2) are called: w) halogens x) transition metals y) alkaline earths z) noble gases

Last Answer : ANSWER: Y -- ALKALINE EARTHS

Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electronegativity (3) Low ionization energy (4) Malleability

Description : Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electronegativity (3) Low ionization energy (4) Malleability 

Last Answer : Tendency to gain electrons

Catalytic converters are generally made from : (1) Alkaline metals (2) Hydrogen (3) Transition metals (4) Carbon

Description : Catalytic converters are generally made from : (1) Alkaline metals (2) Hydrogen (3) Transition metals (4) Carbon

Last Answer : Transition metals

Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO

Description : Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO

Last Answer : Copper is the most noble of first row transition metals and occurs in small deposits in serveral ... -reduction. Iron is removed from chalcopyrite as.

Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO

Description : Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO

Last Answer : Copper is the most noble of first row transition metals and occurs in small deposits in ... self-reduction. Partial roasting of chalcopyrite produces

What is Characteristics of transition metals?

Description : What is Characteristics of transition metals?

Last Answer : They are malleable.

Why can transition metals form cations with a variety of charges?

Description : Why can transition metals form cations with a variety of charges?

Last Answer : Transition metals often form ions without complete octets that'swhy all the stable ions are all cations. You can also tell thatthey form cations because some of the transition metals formcolored compounds and give off light. Light is only given off bycations, not anions.

Why can transition metals form cations with a variety of charges?

Description : Why can transition metals form cations with a variety of charges?

Last Answer : Transition metals often form ions without complete octets that'swhy all the stable ions are all cations. You can also tell thatthey form cations because some of the transition metals formcolored compounds and give off light. Light is only given off bycations, not anions.

f-block elements are also called (a) Alkali metals (b) Inner transition elements (c) Transition elements (d) Transuranic elements

Description : f-block elements are also called (a) Alkali metals (b) Inner transition elements (c) Transition elements (d) Transuranic elements

Last Answer : Ans:(b)

Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electro negativity (3) Low ionization energy (4) Malleability

Description : Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electro negativity (3) Low ionization energy (4) Malleability

Last Answer : (1) Tendency to gain electrons Explanation: The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ... makes it relatively easy to lose some or all of their electrons to land in stable state.

Pick out the wrong statement. (A) Copper is the metal having the highest electronic conductivity (B) Hardenability & Weldability of metals are inversely related (C) Covalent bonding formed by sharing of electrons is present in all semiconductor materials (D) Glass transition temperature applies to 'polymers' but not to 'glasses'

Description : Pick out the wrong statement. (A) Copper is the metal having the highest electronic conductivity (B) Hardenability & Weldability of metals are inversely related (C) Covalent bonding formed by ... all semiconductor materials (D) Glass transition temperature applies to 'polymers' but not to 'glasses'

Last Answer : Option A

Assign the reason for the following: (a) Enthalpy of fusion of water is higher as compared to the hydrides of Sulphur & Selenium. (b) Water is quite stable and does not dissociate in to its elements even at high temperature.

Description : Assign the reason for the following: (a) Enthalpy of fusion of water is higher as compared to the hydrides of Sulphur & Selenium. (b) Water is quite stable and does not dissociate in to its elements even at high temperature.

Last Answer : Ans-a) Due hydrogen bond it has high latent heat of fusion b) Water is a stable compound and its decomposition is not thermodynamically feasible

Explain why Halogens have very high negative electron gain enthalpy?

Description : Explain why Halogens have very high negative electron gain enthalpy?

Last Answer : Ans.The electron gain enthalpy for halogens is highly negative because they can acquire the nearest stable noble gas configuration by accepting an extra electron.

What is Enthalpy Change ?

Description : What is Enthalpy Change ?

Last Answer : : The matte energy that is obtained by combining the product of pressure and volume with the internal energy of a system is called enthalpy. Enthalpy is expressed by H. Therefore - enthalpy = ... of a system can be accurately determined. Change of enthalpy = [product enthalpy - reactive enthalpy]

What is quenching heat or quenching enthalpy ?:?

Description : What is quenching heat or quenching enthalpy ?:?

Last Answer : amount of heat generated during the formation of 1 mol of water by diluting 1 mol H + of a given acid at a temperature of 25 ° C is called quenching heat or quenching enthalpy . The value of the propagation heat of all strong acids and strong bases is equal to - 57.34 kj .

What is combustion heat or combustion enthalpy ?

Description : What is combustion heat or combustion enthalpy ?

Last Answer : The change in enthalpy that occurs when a basic or compound substance is completely burned in oxygen at a certain temperature and 1 atm pressure is called combustion heat or combustion enthalpy. The change ... combustion heat or proof combustion enthalpy of that substance. It is expressed by H ° C.

What is the composition of the compound called heat or structure enthalpy ?

Description : What is the composition of the compound called heat or structure enthalpy ?

Last Answer : The change in enthalpy that occurs during the production of one mole from the constituent elements of a compound in the state of proof is called the formation of heat or formation enthalpy of the compound. The enthalpy ... a temperature of 25 ° C and a pressure of 1 atm is expressed by ∆ H ° f .

What is Lettuce Enthalpy ?

Description : What is Lettuce Enthalpy ?

Last Answer : Lettuce enthalpy is the combination of a gaseous atom's transformation enthalpy method with the basic component of an atom under certain conditions.