Question # 1

How many sigma and pi bonds are present in C2H2.

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one sigma and two pi

two pi and one sigma

Two pi and three sigma

Three pi and two sigma

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

Which statement is true about Na and Na+

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size of Na is greater than Na+

Size of Na is smaller than Na+

Both have equal size

Both have same properties

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

Dipole moment is defined as.

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Charge x distance

Charge x Debye

Charge x displacement

Charge x bond energy

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

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

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

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O2⁺²

N2^-2

B2

F2

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

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sp -s

sp -p

sp2 -p

sp3 -p

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

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346

436

463

336

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

In which one of the following pairs do the molecule have similar shape.

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BF3 and AlCl3

CO2 and H2O

CH4 and PH3

NH3 and BCl3

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

The molecule having zero dipole moment is.

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NH3

CHCl3

H2O

BF3

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

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O₂⁺²

N₂^-2

B₂

F₂

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

Chlorine atom and chloride Cl- ions

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Have same chemical and physical properties

Are allotropes of chlorine

Have same number of electrons

Have same number of proton

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