Scales of Electronegativity
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If the ionization energy of hydrogen is 313.8Kcal per mole, then the energy of the electron in 2nd excited state will be:-
(1) 113.2 Kcal/mole
(2) 78.45 Kcal/mole
(3) 313.8 Kcal/mole
(4) 35 Kcal/mole
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 electro negativity of e is
2.51
2.50
2.52
2.53
Which is the weakest base
NaOH
KOH
Ca(OH)2
Zn(OH)2
- 2
- 544
- 0.208
- 2.8
CO, B2O3, SiO2, CO2, Al2O3, PbO2, Tl2O3
(b) Write suitable chemical equations to show their nature.
- Scandium (Sc)
- Platinum (Pt)
- Palladium (Pd)
- Mangenese (Mn)
- 5.08%
- 6.05%
- 4.08%
- 7.01%
Pauling's electro negativity values for elements are useful in predicting
Polarity of the molecules
Position in the electro chemical series
Co-ordination number
Dipole moments
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?
2.53
2.51
2.50
2.52
Pauling's electronegativity values for elements are useful in predicting?
Polarity of the molecules
Position in the electrochemical series
Coordination number
Dipole moments
The 3d transition series starts from which atomic number?
21
22
19
20
- Decrease from carbon to fluorine.
- Increase from carbon to fluorine.
- Increase upto oxygen and then decrease upto fluorine.
- Decrease from carbon to nitrogen and then increase continyously.
EH−H=104.2 kcalmol−1, EF−F=36.6 kcalmol−1,
EH−F=134.6 kcalmol−1, XH=2.1
- 3.87
- 1.77
- 2.67
- 4.87
- 2.726
- 2.762
- 3.762
- 3.726
- 2.726
- 2.762
- 3.726
- 3.762
- Ca<Ge<Mg<Ga<K
- Ca<Ge<K<Mg<Ga
- Ge<Ga<Mg<Ca<K
- Ge<Ga<K<Ca<Mg
- 1.64
- 1.8
- 2.58
- 2.91
calculate the ratio of partial positive charge on H-atom in HCL to that in HI from the following data;
dipole moment of HCL = 1.03 D , Bond Length = 127 pm dipole moment of HI = .38 D Bond length = 161 pm>