Question # 1

Which of the following is not a characteristic of covalent compound.

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They have low melting and boiling points.

They ionize on dissolution in polar solvents

Their molecules have definite geometry

They are generally insoluble in water

Group VA of the periodic table consist of elements.

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3

4

5

6

By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly

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Hard

Brittle

Tough

Soft

Which of the following statements correct regarding copper.

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It is used in electroplating

Its salts are used as insecticides

Its salts are used as coloring materials

All are correct

Which of the following statements is worng.

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Covalent compounds are generally soluble is polar solvents

Covalent compounds have low melting and boiling point.

Ionic solids do not conduct electricity is solid state

Ionic compounds conduct electricity in the fused state.

Which element among the following cannot exhibit variable electronvalency

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₂₉Cu

₅₀Sn

₂₅ Mn

₃₈ Sr

Number of unpaired electrons in Cu2+ ions are.

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1

2

3

4

The most electronegative and the most electromotive elements of the first period is

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H and He

Na and Cl

Li and F

H and He

In the formation of H2O molecule, the oxygen atom makes use of.

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2p orbitals

sp hybrid orbitals

Sp2 hybrid orbitals

Sp3 hybrid orbitals

A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .

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2

1

0

3

Lead pencil contain

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Lead

Lead sulphide

a mixture of lead and silica

graphite

Which is not an ore of aluminium.

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Baxuite

Cryolite

Monazite

Corundum

Which of the following is not a property of Ni.

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it is a soft silvery white metal

It is malleable and ductile

It is highly magnetic

It has high electrical and thermal conductivities

Among the elements A,B,C and D having atomic numbers 9,10,11, and 12 respectively, the correct order of ionization energies is.

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A > B > C >D

B > A > D > C

B > A > C > D

D > C > B > A

CCl4 has zero dipole moment because of.

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Planar structure

Tetrahedral structure

Similar size of C and Cl atoms

Similar electrons affinity of C and Cl

Used for sterilizationof drinking water

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F

Br

Cl

I

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

Which of the following property is not related to aluminum.

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it is silvery white metal with brilliant lusture

It is a very light metal with specific gravity as 2.7

It is good conductor of heat

It is the least reactive element of III Group.

Copper occurs in nature as.

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Native

Combined

Both native and combined

None of the above

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

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