Explain :  Electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?

Explain :  Electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?
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Explain : Electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?
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Explain why Electron gain enthalpy of noble gases is positive.

Description : Explain why Electron gain enthalpy of noble gases is positive.

Last Answer : Ans. Noble gases have large positive electron gain enthalpies because the extra electron has to be placed in the next higher principal quantum energy level, thereby producing highly unstable electronic configuration.

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.

From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. (c) The element with smallest ionic radius. (d) The element with six electrons in the valence shell. (e) The element which is a liquid at room temperature. (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.

Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.

Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.

Arrange the following order of the property indicated: (a). F, Cl, Br and I (negative electron gain enthalpy) (b). Mg, Al, Si and Na (ionization enthalpy) (c). C, N, O and F (second ionization enthalpy)

Description : Arrange the following order of the property indicated: (a). F, Cl, Br and I (negative electron gain enthalpy) (b). Mg, Al, Si and Na (ionization enthalpy) (c). C, N, O and F (second ionization enthalpy)

Last Answer : Ans. (a). I

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Description : Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Last Answer : Ans. Second electron affinity of O is largely +ve because of repulsion between negatively charged ions and second electron to be added. Energy required to overcome repulsion is more than the energy released in gaining electron, so net energy is absorbed.

Which out of F or Cl has a more negative electron gain enthalpy?

Description : Which out of F or Cl has a more negative electron gain enthalpy?

Last Answer : Ans. Cl has more negative electron gain enthalpy. It is because there is more inter electronic repulsion between valence electrons of F, due to smaller size than Cl.

Halogens have maximum negative electron gain enthalpy in the respective periods in the P. T Why ?

Description : Halogens have maximum negative electron gain enthalpy in the respective periods in the P. T Why ? 

Last Answer : Ans Due to smallest size and high effective nuclear charge , readily accept one electron  to acquire noble gas electronic configuration  

How is electrolytic conductance measured experimentally?

Description : How is electrolytic conductance measured experimentally?

Last Answer : Electrolyte conductance can be measured by putting anode and cathode on it and measured the external voltage. Then compared the same with some standard known electrolyte solution. Also, specific ... charge discharge method. So by calculating with inbuilt software we can easily get the conductance.

Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have to measure the cell potential to obtain the difference in potential energy because the potential of half-reactions cannot be measured directly. C The direction of a redox reaction can only be determined experimentally. D Half-cell potentials for half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Description : Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have ... half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Last Answer : C The direction of a redox reaction can only be determined experimentally. 

The value of G, the universal gravitational constant, was measured experimentally by: w) Newton x) Cavendish y) Copernicus z) Kepler

Description : The value of G, the universal gravitational constant, was measured experimentally by: w) Newton x) Cavendish y) Copernicus z) Kepler

Last Answer : ANSWER: X -- CAVENDISH

The energy released when an extra electron is added to a neutral gaseous atom is called (a) Bond energy (b) Electron affinity (c) Ionization potential (d) Electronegativity

Description : The energy released when an extra electron is added to a neutral gaseous atom is called (a) Bond energy (b) Electron affinity (c) Ionization potential (d) Electronegativity

Last Answer : Ans:(b)

Define the following : Atomic Radii , Ionization Energy , Electron Affinity , Electronegativity.

Description : Define the following : Atomic Radii , Ionization Energy , Electron Affinity , Electronegativity.

Last Answer : Ans :(1) Atomic Radii : An atom does not have strictly defined boundaries so it is impossible to determine the exact radius of an atom but theoretically it is defined as half the distance between the ... in Period : It increases from left to right in a period due to increase in nuclear charge.

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).

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

9. One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations. -Physics-10

Description : 9. One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations. -Physics-10

Last Answer : Yes, it will produce a complete image of the object, as shown in the figure. This can be verified experimentally by observing the image of a distant object like a tree on a screen when the ... the lens is covered with a black paper. However, the intensity or brightness of the image will reduce.

The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the (A) Reaction is elementary with a molecularity of 2 (B) Molecularity of the reaction is 2, but the reaction may not be elementary (C) Reaction may be elementary with molecularity of 2 (D) Reaction is elementary but the molecularity may not be 2

Description : The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the (A) Reaction is elementary with a molecularity of 2 (B) Molecularity of the reaction is 2, ... Reaction may be elementary with molecularity of 2 (D) Reaction is elementary but the molecularity may not be 2

Last Answer : (A) Reaction is elementary with a molecularity of 2

Who firstly demonstrated experimentally the existence of electromagnetic wave? -General Knowledge

Description : Who firstly demonstrated experimentally the existence of electromagnetic wave? -General Knowledge

Last Answer : The answer is 'Hertz'

Who firstly demonstrated experimentally the existence of electromagnetic wave? -General Knowledge

Description : Who firstly demonstrated experimentally the existence of electromagnetic wave? -General Knowledge

Last Answer : answer:

Who firstly demonstrated experimentally the existence of electromagnetic wave? -General Knowledge

Description : Who firstly demonstrated experimentally the existence of electromagnetic wave? -General Knowledge

Last Answer : answer:

While determining the refractive index of a liquid experimentally, the microscope was focussed at the bottom of a beaker, when its reading was 3.965 c

Description : While determining the refractive index of a liquid experimentally, the microscope was focussed at the bottom of a beaker, when its reading was 3.965 c

Last Answer : While determining the refractive index of a liquid experimentally, the microscope was focussed at the ... . Find the refractive index of the liquid.

Alloxan can experimentally induce diabetes mellitus due to (A) Stimulation of α cells of the islets of langerhans (B) Necrosis of the β cells of the islets (C) Potentiation of insulinase activity (D) Epinephrine like action

Description : Alloxan can experimentally induce diabetes mellitus due to (A) Stimulation of α cells of the islets of langerhans (B) Necrosis of the β cells of the islets (C) Potentiation of insulinase activity (D) Epinephrine like action

Last Answer : Answer : B

Who among the following demonstrated experimentally that simple organic molecules like sugar s and amino acids could be produced from inorganic molecules if early earth atmosphere is created (a) Donald Brown (b) A.I. Oparin (c) Oscar Miller (d) Stanley Miller

Description : Who among the following demonstrated experimentally that simple organic molecules like sugar s and amino acids could be produced from inorganic molecules if early earth atmosphere is created (a) Donald Brown (b) A.I. Oparin (c) Oscar Miller (d) Stanley Miller

Last Answer : Ans:(d)

The theory of spontaneous generation of life was experimentally disproved by: 1. Francesco Redi 2. Lamark 3. Leeuwenhock 4. Louis Pasteur Select the correct answer using the codes given below: (a) Only 1 (b) 2 and 3 (c) 1 and 4 (d) Only 4

Description : The theory of spontaneous generation of life was experimentally disproved by: 1. Francesco Redi 2. Lamark 3. Leeuwenhock 4. Louis Pasteur Select the correct answer using the codes given below: (a) Only 1 (b) 2 and 3 (c) 1 and 4 (d) Only 4

Last Answer : Ans:(c)

What happens when a chemical bond is formed? (1) energy is always absorbed (2) energy in always released (3) more energy is released than is absorbed (4) energy is neither released nor absorbed Correct (4) Answer – (1) energy is always absorbed Explanation: If a bond is broken, energy is released; and if a bond is formed, energy must have been absorbed. As these occur, a change in the chemical energy of the system also occurs. Within each bond of a molecule is an experimentally determined amount of enemy that upon the breaking of that bond is released into the chemical system. The energy within these bonds are 'stored' and can be easily thought of as potential energy. Upon the breaking of these bonds the energy is released thereby creating usable energy.

Description : What happens when a chemical bond is formed? (1) energy is always absorbed (2) energy in always released (3) more energy is released than is absorbed (4) energy is neither released nor ... as potential energy. Upon the breaking of these bonds the energy is released thereby creating usable energy.

Last Answer : Silver nitrate solution is kept in brown bottles in laboratory because - (1) it reacts with ordinary white bottles (2) brown bottles stops the passage of light through it (3) brown bottles do not react with it (4) brown bottles react with it

Who firstly demonstrated experimentally the existence of electromagnetic wave?

Description : Who firstly demonstrated experimentally the existence of electromagnetic wave?

Last Answer : Hertz

Oxygen was experimentally prepared by

Description : Oxygen was experimentally prepared by

Last Answer : Karl Scheele

Nucleic acids are unique among the biopolymers in that they contain phosphate. How has this property been exploited experimentally in studies

Description : Nucleic acids are unique among the biopolymers in that they contain phosphate. How has this property been exploited experimentally in studies of protein synthesis?

Last Answer : The use of 32P (radioactive) to label DNA and RNA for Southern and northern blotting was a major technical advance. One of the earliest exploitations of the unique phosphorus content of nucleic ... machinery to direct the synthesis of many copies of the virus, eventually leading to host cell.  

Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0 ) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)? (A) ε = ε0 + α.t (B) ε = ε0 + α.t 2 (C) ε = ε0 + α.t 3 (D) ε = ε0 + α.t

Description : Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0 ) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined ... ε = ε0 + α.t 2 (C) ε = ε0 + α.t 3 (D) ε = ε0 + α.t

Last Answer : (A) ε = ε0 + α.t

Pick out the wrong statement. (A) 'Hold back' is defined as the fraction of material that stays longer than the mean residence time (B) Study of non-ideal flow reactor is done experimentally by stimulus￾response technique (C) For studying a chemical reaction, it is desirable to monitor the reactants during initial stages and the products during the final stages of reaction (D) A batch reactor cannot be used to study the kinetics of catalytic reaction

Description : Pick out the wrong statement. (A) 'Hold back' is defined as the fraction of material that stays longer than the mean residence time (B) Study of non-ideal flow reactor is done experimentally ... final stages of reaction (D) A batch reactor cannot be used to study the kinetics of catalytic reaction

Last Answer : (D) A batch reactor cannot be used to study the kinetics of catalytic reaction

The order of a chemical reaction is (A) An experimentally determined quantity (B) Always equal to the total stoichiometric number of reactants (C) Never fractional (D) None of these

Description : The order of a chemical reaction is (A) An experimentally determined quantity (B) Always equal to the total stoichiometric number of reactants (C) Never fractional (D) None of these

Last Answer : (A) An experimentally determined quantity

All chiral D-sugars rotate plane-polarized light : (a) clockwise (b) counterclockwise (c) +20.0° (d) in a direction that cannot be predicted but must be determined experimentally

Description : All chiral D-sugars rotate plane-polarized light : (a) clockwise (b) counterclockwise (c) +20.0° (d) in a direction that cannot be predicted but must be determined experimentally

Last Answer : in a direction that cannot be predicted but must be determined experimentally

The order of a chemical reaction (A) Can be determined only experimentally (B) Can be determined from the stoichiometry of the reaction (C) Cannot be zero (D) Can be fractional

Description : The order of a chemical reaction (A) Can be determined only experimentally (B) Can be determined from the stoichiometry of the reaction (C) Cannot be zero (D) Can be fractional

Last Answer : (B) Can be determined from the stoichiometry of the reaction (C) Cannot be zero

de Broglie’s relation for matter waves was experimentally verified by: a) Davisson b) Germer c) G.P. Thomson d) All the these

Description : de Broglie’s relation for matter waves was experimentally verified by: a) Davisson b) Germer c) G.P. Thomson d) All the these

Last Answer : c) G.P. Thomson

38. “Increased diversity contributed to higher productivity” –was experimentally proved by ... b) David Tilman b) Paul Ehrlich c) Alexander Von Humbolt d) Robert May

Description : 38. “Increased diversity contributed to higher productivity” –was experimentally proved by ... b) David Tilman b) Paul Ehrlich c) Alexander Von Humbolt d) Robert May

Last Answer : b) David Tilman

18. “Increased diversity contributed to higher productivity” –was experimentally proved by ... a) David Tilman b) Paul Ehrlich c) Alexander Von Humbolt d) Robert May

Description : 18. “Increased diversity contributed to higher productivity” –was experimentally proved by ... a) David Tilman b) Paul Ehrlich c) Alexander Von Humbolt d) Robert May

Last Answer : a) David Tilman

Coacervates were experimentally produced by a) Oparin and Haldane b) Darwin c) Aristotle d) Louis Pasture

Description : Coacervates were experimentally produced by a) Oparin and Haldane b) Darwin c) Aristotle d) Louis Pasture 

Last Answer : a) Oparin and Haldane

Dirac theoretically predicted the existence of the positron. Who experimentally identified positrons in 1932 in cloud chamber pictures of cosmic ray particle tracks?

Description : Dirac theoretically predicted the existence of the positron. Who experimentally identified positrons in 1932 in cloud chamber pictures of cosmic ray particle tracks?

Last Answer : ANSWER: (C. D.) ANDERSON

The wave nature of electrons was EXPERIMENTALLY verified by: w) Einstein x) Davisson and Germer y) Balmer z) Bohr.

Description : The wave nature of electrons was EXPERIMENTALLY verified by: w) Einstein x) Davisson and Germer y) Balmer z) Bohr.

Last Answer : ANSWER: X -- DAVISSON AND GERMER

1. Sex determination of child is done by whose chromosome? 2. Who is authorised to decide over a dispute regarding disqualification of a member of Parliament? 3. Who firstly demonstrated experimentally the existence of electromagnetic wave? 4. Which is not essentially a species of the Himalayan vegetation? 5. What are the main channels of our knowledge about the Indus Valley Civilization?

Description : 1. Sex determination of child is done by whose chromosome? 2. Who is authorised to decide over a dispute regarding disqualification of a member of Parliament? 3. Who firstly demonstrated ... of bargets, coasters and dredgers? 20. In which country was Buddhism first propogated outside India?

Last Answer : Answer : 1. Father 2. President 3. Hertz 4. Mahogany 5. Archaeological excavations 6. December 20 7. International Year of Volunteers 8. Increase growth in lenght 9. Tropical moist deciduous ... . Boxing 17. Herbert Spencer 18. During a Financial Emergency 19. Garden Reach Shipyard 20. Srilanka

If oxygen which has an electronegativity of 3.5 bonds with hydrogen which has an electronegativity of 2.1 the bond between the two atoms will be classified as a polar what bond?

Description : If oxygen which has an electronegativity of 3.5 bonds with hydrogen which has an electronegativity of 2.1 the bond between the two atoms will be classified as a polar what bond?

Last Answer : Need answer

If the difference in electronegativity values between two atoms is more than 2.0 non-polar covalent bonds generally form?

Description : If the difference in electronegativity values between two atoms is more than 2.0 non-polar covalent bonds generally form?

Last Answer : At this value an ionic bond is formed.

If the difference in electronegativity values between two atoms is less than 0.4 nonpolar covalent bonds generally form?

Description : If the difference in electronegativity values between two atoms is less than 0.4 nonpolar covalent bonds generally form?

Last Answer : True apex:)

If nitrogen which has an electronegativity of 2.0 bonds with hydrogen which has an electronegativity of 2.1 the bond between the two atoms will be classified as?

Description : If nitrogen which has an electronegativity of 2.0 bonds with hydrogen which has an electronegativity of 2.1 the bond between the two atoms will be classified as?

Last Answer : Feel Free to Answer

The two elements required to form substitutional solid solution should not have (A) Same crystalline structure (B) Same valency (C) Widely differing electronegativity (D) Same atomic sizes

Description : The two elements required to form substitutional solid solution should not have (A) Same crystalline structure (B) Same valency (C) Widely differing electronegativity (D) Same atomic sizes

Last Answer : C) Widely differing electronegativity

What is electronegativity ?

Description : What is electronegativity ?

Last Answer : The ability of an atom to attract more of the shared electron pairs of covalent bonds to itself is called the electronegativity of that atom. Non-metallic electronegativity is high and ... . Fluorine has the highest electronegativity , followed by oxygen , chlorine , and nitrogen atoms.

What is Electronegativity ?

Description : What is Electronegativity ?

Last Answer : : The ability of an electron pair to attract a shared electron pair is called the electron negativity of the element.

An atom with high electronegativity generally has :-

Description : An atom with high electronegativity generally has :-

Last Answer : An atom with high electronegativity generally has :- A. tendency to form +ve ions B. high ... C. large atomic size D. low electrons affinity

The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise

Description : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise

Last Answer : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have ... (D) clathrates with He and Ne are highly expolsive.

The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise

Description : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise

Last Answer : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have ... +6HF underset(Delta)overset("475 K")to XeF_6+3H_2O`

The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise

Description : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise

Last Answer : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest ... Ill), (lV) D. (D) (I), (lV)