Electronegativity

Q.

Electron gain enthalpy values of noble gases are positive because:

1. They have smallest size

2. They are monoatomic

3. They have stable electronic configuration

4. They are all gases

Q.

Hanny - smith formula for calculating the percentage of ionic character is

1. 16(x_A - x _B) + 3.5 (x_A - x_B)²

2. 16(x_A - x _B) - 3.5 (x_A - x_B)²

3. 16(x_A - x _B)² - 3.5 (x_A - x_B)

4. 16(x_A - x _B)² + 3.5 (x_A - x_B)²

Q. electronic energy of hydrogen atom depends on the quantum number

Q. 2.The ionization potential for the electron in the ground state of hydrogen atom is 13.6 cv. What would be the ionization potential for the electron in the first exicted state of Li2+?

Q.

For the formation of covalent bond, the difference in the value of electronegativities should be

1. Equal to or less than 1.7

2. More than 1.7

3. 1.7 or more

4. None of these

Q. The set representing the correct order of ionic radius is:(A) Li+ > Be2+ > Na+ > Mg2+ (B) Na+ > Li+ > Mg2+> Be2+ (C) Mg2+ > Be2+ > Li+ > Na+ (D)Li+ > Na+ > Mg2+>Be2+(explain briefly)

Q.

The electronegativity of an atom depends upon the nature of substituent attached to that atom.

1. True

2. False

Q. 98.How many atoms are present in 120 amu calcium

Q.

Group 2 elements are:

1. Oxidizing agents

2. Oxidizing as well as reducing agents

3. Reducing agents

4. Neither oxidizing nor reducing agents

Q. 9. The X-X bond length is 1 angstrom and C-C bond length is 1.54 angstrom. If electronegativities of X and C are 3 and 2 respectively, the C-X bond length is likely to be A)1.27 B)1.18 C)1.08 D)1.28

Q. allred rochow scale of electronegativit

Q. Compound of a metal M is M2O3, the formulae of its halide is?

Q.

Which of the following is most electronegative

1. Silicon

2. Carbon

3. Lead

4. Tin

Q. 31.Assertion :H-F forms stronger hydrogen bond than H2O. Reason:F is more electronegative than oxygen Is both statements correct and correct explanation or not

Q. The $I_3^{-}$ ion has:

1. Five equatorial lone pairs on the central $I$ atom and two axial bonding pairs in a trigonal bipyramidal arrangement
2. Five equatorial lone pairs on the central $I$ atom and two axial bonding pairs in a pentagonal bipyramidal arrangement
3. Three equatorial lone pairs on the central $I$ atom and two axial bonding pairs in a trigonal bipyramidal arrangement
4. Two equatorial lone pairs on the central $I$ atom and three axial bonding pairs in a trigonal bipyramidal arrangement

Q. what is polyatomic and diatomic molecules ?

Q. How covalent character is present in ionic compound

Q.

Electronegativity is the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.

1. True

2. False

Q. Which contains greater no. of oxygen atoms and why a. 1 gm O b. 1 gm O2 c. 1 gm O3 d. all have same

Q. When we fill electrons, we have to do according to AUFBAU order but when we need to remove electrons(while writing electronic configuration for ions) we start from outermost shell. Why is this so?

Q.

Define electronegativity. How does it differ from electron gain enthalpy?

Q. 49 Strength of H2O2 is 15.18 g/L , then it is equal to:-

Q. 70.Which compound have more ionic character NaCl or NaF?

Q. What do you mean by partial negative and positive sign in chemistry?

Q.

The outermost electronic configuration of the element with least electronegativity among the following is?

1. 2$s^2$2$p^5$

2. 3$s^2$3$p^6$

3. 2$s^2$2$p^4$

4. 6$s^2$6$p^6$7$s^1$

Q. The correct order of increasing $X-O-X$ bond angle is $(X=H,F\text{or}Cl)$:

1. $H_{2}O>C{l}_{2}O>F_{2}O$
2. $C{l}_{2}O>H_{2}O>F_{2}O$
3. $F_{2}O>C{l}_{2}O>H_{2}O$
4. $F_{2}O>H_{2}O>C{l}_{2}O$

Q. what is the covalency of nitrogen

Q. 1.why is ionization enthalpy always (+)ve? 2.what is shielding effect ?What is slaters rule? 3.why do inert gases have large atomic radius? 4.calculate the electronegativity of C :- E(h-h)=104.2kcal/mol , E(c-c)=83.1kcal/mol , E(h-c)=98.8kcal/mol

Q.

you have said that second electron can exchange energy with third electron but third electron cannot do so with second electron. Why is it so. After all exchange takes place when both electrons exchange their energy

Q. The $I_3^{-}$ ion has:

1. Five equatorial lone pairs on the central $I$ atom and two axial bonding pairs in a trigonal bipyramidal arrangement
2. Five equatorial lone pairs on the central $I$ atom and two axial bonding pairs in a pentagonal bipyramidal arrangement
3. Three equatorial lone pairs on the central $I$ atom and two axial bonding pairs in a trigonal bipyramidal arrangement
4. Two equatorial lone pairs on the central $I$ atom and three axial bonding pairs in a trigonal bipyramidal arrangement