Scales of Electronegativity

Q.

Compare the dipole moment of the following.

CH₃F, CH₃Cl, CH₃Br, CH3 I.

Q.

Explain the pauling scale for the determination of electronegativity

Q. On rising temperature and decreasing pressure in CsCL solid (1) C.N. of metal ion increases from 6 to 8 (2) Number of formula units per unit cell (Z) changes from one to four (3) Density of unit cell is increased (4)(radius ratio) is increased Doesnt option 2 and 3 refer to the same thing? And why is Z value increasing?

Q.

Calculate electronegativity of fluorine using paulings scale , mullikens scale and allred Rochows scale.

Q.

What is the unit of measurement used for electronegativity?

Q.

How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?

Q. On Pauling’s electronegativity scale, which element is next to $F?$

1. $Cl$
2. $Br$
3. $O$
4. $Ne$

Q. Ionisation energy and electron affinity of fluorine are respectively $17.42$ and $3.45\text{eV}.$ Calculate the electronegativity of fluorine atom on Pauling's scale.

1. $2.726$
2. $2.762$
3. $3.726$
4. $3.762$

Q. The electronegativity values of $C,N,O$ and $F$ on Pauling scale:

1. Decrease from carbon to nitrogen and then increase continyously.
2. Increase from carbon to fluorine.
3. Increase upto oxygen and then decrease upto fluorine.
4. Decrease from carbon to fluorine.

Q. Why Standard electrode potential of hydrogen is taken as 0?

Q. Which of the following property of ammonia explains its basic nature?

1. Reaction with acids
2. Reaction with bases
3. Reaction with metal salts
4. Complex formation

Q. 25. If 0.5 litre of a 0.6M SnSO4 solution is electrolysed for a period of 30 minutes using a current of 4.6 ampere and inert electrodes are used. what is the final concentration of Sn+2 ion remaining in the solution (atomic weight of Sn -119) A)0.342M B)0.544M C)0.389M D)0.514M

Q. Which element has the most metallic character?

1. Boron
2. Aluminium
3. Indium
4. Thallium

Q. Which of the following statements is not true for the reaction: $2F_2+2H_{2}O\to 4HF+O_2$?

1. $F-F$ bond is weaker than $O=O$ bond
2. $H-F$ bond is stronger than $H-O$ bond
3. $F$ is less electronegative than $O$
4. $F_2$ is more strongly oxidising than $O_2$

Q. Calculate ${\Delta }_f{H}^o\text{in kJ}$ (magnitude only) for chloride ion (in aq.) from the following data:
$\frac{1}{2}{H}_2\left(g\right)+\frac{1}{2}C{l}_2\left(g\right)\to HCl\left(g\right);{\Delta }_f{H}^o=-92.4\text{kJ}HCl\left(g\right)+H_{2}O\left(l\right)\to H_3{O}^{+}+\left(aq\right)+C{l}^{-}\left(aq\right);\Delta H^o=-74.8\text{kJ}$
${\Delta }_f{H}^o\text{of}{H}^{+}\left(aq\right)=0.0\text{kJ}$

Q. The correct order of acidic strength is

1. $N_2{O}_2>MgO>ZnO>P_2{O}_5$
2. $S{O}_2<P_2{O}_3<Si{O}_2<A{l}_2{O}_3$
3. $C{l}_2{O}_7>S{O}_2>P_4{O}_{10}$
4. $C{O}_2>N_2{O}_5>S{O}_3$

Q. Pauling’s electronegativity is based on

1. Electron affinity (EA)
2. Ionisation Energy (IE)
3. Both IE + EA
4. Bond energies

Q.

The bond dissociation energy of H - H, C - C, and C - H bonds respectively are 104.2, 83.1 and 98.8 kcal/ mole. The electronegativity of C is?

1. 2.53

2. 2.50

3. 2.51

4. 2.52

Q. The concept of electronegativity is not applicable to an element having which of the following outer shell configurations?

1. $n{s}^{2}n{p}^3$
2. $n{s}^{2}n{p}^5$
3. $n{s}^{2}n{p}^4$
4. $n{s}^{2}n{p}^6$

Q. Which of the following element have the least ability to react with acid to liberate hydrogen?

1. $Zn$
2. $Cr$
3. $Cu$
4. $Ni$

Q. Which of the following elements is the least metallic?

1. Scandium (Sc)
2. Platinum (Pt)
3. Palladium (Pd)
4. Mangenese (Mn)

Q.

Though [CuCl4]^2- exists, but [CuI4]^2- doesn't - Why?

Q. Most ionic bond is present in

1. LiH
2. HI
3. HF
4. CsH

Q. If the ionisation energy and electron affinity of an element are 275 and 86 kcal mol-1 respectively, then the electronegativity of the element on the Mulliken scale is. 2.8. 0.0. 4.0.

Q. The X -X bond length is 1.5 $\stackrel{\circ }{A}$ and Y - Y bond length is $2.54\stackrel{\circ }{A}$. If electronegativities of 'X' and 'Y' are 3.5 and 2.0 respectively, the X - Y bond length is likely to be

1. $1.44\stackrel{\circ }{A}$
2. $2.02\stackrel{\circ }{A}$
3. $1.88\stackrel{\circ }{A}$
4. $2.88\stackrel{\circ }{A}$

Q. A compound MX2, has observed and normal molecular masses 65.6 and 164 respectively.Calculate percentage of ionization of MX2 (1) 75%(2) 65%(3) 55%(4) 35%

Q. If ${\in }_{C-C}=348{\text{kJmol}}^{-1},{\in }_{C-H}=412{\text{kJmol}}^{-1}\text{and}{\in }_{H-H}=-436{\text{kJmol}}^{-1}$, the Pauling electronegativity of $C$ is about ______. (Given: electronegativity of $H$ = 2.1)

1. 1.64
2. 1.8
3. 2.58
4. 2.91

Q. Using the following data, calculate the electronegativity of fluorine.
$E_{H-H}=104.2{\text{kcalmol}}^{-1},E_{F-F}=36.6{\text{kcalmol}}^{-1},$
$E_{H-F}=134.6{\text{kcalmol}}^{-1},X_H=2.1$

1. 3.87
2. 2.67
3. 4.87
4. 1.77

Q.

Formula to find electronegativity of elements

Q. Identify the correct order of acidic strength of $C{O}_2,CaO,H_{2}O$.

1. $CaO<H_{2}O<C{O}_2$
2. $H_{2}O<C{O}_2<CaO$
3. $CaO<H_{2}O<C{O}_2$
4. $H_{2}O<CaO<C{O}_2$