Question # 1

The nature of bond in diamond is

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Electrovalent

Metallic

Coordinate covalent

Covalent

Which one of the following correctly describe the shape of NH3 molecules.

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tetrahedral

Pyramidal

Angular

Square planar

The cell in which a non spontaneous redox reaction takes place as a result of electricity is known as.

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Voltaic cell

Denial cell

dry Cell

Electrolytic cell

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

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

Maximum number of electrons in f-subshell is.

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2

6

10

14

The charge on electron was determined by millikan in his oil drop experiment and its value is

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6.023 x 10^-23C

1.602 x 10^-23C

1.602 x 10^-19C

6.625 x 10^-34C

The Avogadro constant is the number of.

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Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

Which of the following has linear structure.

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CO2

NH3

CH4

H2O

Which compound does not obey the octet rule.

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NH3

BCl3

H2O

CH4

Which of the following molecule has zero dipole moment.

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NH3

CHCl3

H2O

BF3

K_aand K_bof a conjugate acid and are related with k_was

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K_a+ K_b=K_w

K_a-K_b=K_w

K_a.K_b= K_w

K_a/ K_b= K_w

The value of pH and P^oHof pure water at 25° C is

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14

7

1 x 10^-14

1 x 10¹⁴

The pH of human blood is

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7.0

7.4

4.0

6.5

Which pair of mixture is called ideal solution.

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Chlorobenzene and bromobenzene

Water alcohol

Water ether

HCl and water

Boiling point of a liquid is high when

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There is no hydrogen bonding

Dipole moment is zero

Inter molecular forces are weak

Hydrogen bonding is present

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