Question # 1

The shielding effect of the inner electrons is responsible for

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Increasing ionization energy values

Decreasing ionization energy values

Increasing electron affinity

Increasing electonegativity

Percentage ionic character of HF is.

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100%

80%

43%

57%

Which pair are iso electronic.

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Na+ and Cl-

Na+ and Mg+2

N-3 and P-3

H+ and H-

In BeCl2, the covalent bond is formed due to overlap of

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sp -s

sp -p

sp2 -p

sp3 -p

Which of the hydrogen halides has the highest percentage of ionic character

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HF

HBr

HCI

HI

Which of the following species has unpaired electrons in antibonding molecular orbitals.

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O2⁺²

N2^-2

B2

F2

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

Which of the following has highest percentage ionic character.

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HCl

HF

HBr

HI

Which molecule has sG2 hybridization.

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CH4

C2H4

C2H2

C2H5

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

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O₂⁺²

N₂^-2

B₂

F₂

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

An ionic compound A⁺B^-is most likely to be formed when

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The ionization energy of A is high and electron affinity of B is low

The ionization energy of A is low and electron affinity of B is high

Both the ionization energy of A and electron affinity of B are high

Both the ionization energy of A and electron affinity of B are low

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

The octet rule in not followed in the formation of

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NF₃

CF₄

CCI₄

PCI₅

The bond angle in NH3 molecule is

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109.5^o

107.5^o

104.5^o

106^o

Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5^o and 107.5 ^o respectively. This deviation is due to.

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Hydrogen bonding in ammonia

Lone pair attraction

Lone pair occupy more space and repel to other bond pairs

Lone pair lone pair repulsion

The carbon atom is C2H4 is.

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sp3 hybridized

sG2 hybridized

Sp hybridized

dsG2 bybridized

The molecule having zero dipole moment is.

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NH3

CHCl3

H2O

BF3

The H - H Bond energy in KJ mole -1 is.

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346

436

463

336

Forces of attraction between He atoms are.

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Hydrogen bonding

London forces

Debye forces

Ion dipole forces

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