Question # 1

Suppose a new element 'J' has discovered and has seven electron in the valence shell. Which statement about this element would be correct.

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It is monatomic

It form covalent bond with hydrogen

It forms stable positive ion

It forms covalent bond with group IA element

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

Which of the following molecules has zero dipole moment

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NH₃

CHCI₃

H₂O

BF₃

What is bond order.

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Number of unpaired electrons

Number of paired electrons

Number of electrons present in antibonding molecular orbital

Number of bond formed between two atoms after overlap

The shape of Sncl2 molecule is.

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Linear

Angular

Trigonal planar

Tetrahedral

Which pair are iso electronic.

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Na+ and Cl-

Na+ and Mg+2

N-3 and P-3

H+ and H-

The number of bonds in nitrogen molecule is

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One o and oneπ

One o and twoπ

Three sigma only

Two o and twoπ

The shape of H₃O is

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Tetrahedral

Angular

Trigonal planer

Pyramidaj

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

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O₂⁺²

N₂^-2

B₂

F₂

If we want to change O₂to O₂^-1The electron is to be placed in

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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

Which of the following is true for ionic compounds

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They are non-electrolytes in the molten state

They have bonds which are directional

They conduct electricity in solid state

They are generally more soluble in polar solvents than in non-polar solvents

Which has zero potential energy.

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When H atom is independent

When two H atoms combine to form H2 molecule

When two H atoms super impose to each other

When two H atoms have weak attraction between them

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

As compared to pure atomic orbitals the hybrid orbitals have.

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Low energy

High energy

Same energy

None of these

The percentage of s characters in sp3 hybrid orbital is.

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25%

33.3%

50%

75%

According to MOT, which molecular orbital has highest energy.

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sigma 1s

pi+ 2S

pi 2py

Pi+ 2px

The carbon atom is C2H4 is.

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sp3 hybridized

sG2 hybridized

Sp hybridized

dsG2 bybridized

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