Question # 1

Which of the following is a polar molecule

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CCl4

HCl

BF3

CO2

The molecular shape of SO3 is.

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Triangular planar

Tetrahedral

Pyramidal

Linear

Pressure remaining constant at which temperature the volume of a gas will become twice of what it is at 0° C

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546°C

200°C

546 K

273 K

Which liquid has low boiling point with.

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Less intermolecular force and higher V.P

Greater intermolecular forces and low V.P

Bigger size and greater polarizability

High hydrogen bonding in it

Which statement is correct about solubility product constant.

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It is applicable at highly soluble substances.

Value of Kap is independent of temperature

It is used for homogeneous aquarium system

It can be used to predict that precipitation will take place or not by combining two ions

Bohr's model of atom is contradicted by

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Planck quantum theory

Quartization of energy of electrons

Heisenberg's uncertainty principle

Quartization of angular members

Diamond is a bad conductor because.

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It has tight structure.

It has a high density

There is no free electron present in the crystal of diamond to conduct electricity

None of the above

The spreading of fragrance of a rose or scent in air is due to.

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Effusion

Diffusion

Osmosis

Evaporation

The reaction that involves gases, its rate does not depend upon

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Catalyst

Temperature

Moles dm^-3

Partial pressure

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

To achieve a good separation, the two liquids are gently shaken to increase their area of.

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Miscibility

Separation

contact

Solubility

Partial pressure of oxygen in the air is.

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156 torr

157 torr

158 torr

159 torr

When a chemical reaction is completed the

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

The volume occupied by 1.6 g of O₂at STP is

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22.4 dm³

2.24 dm³

1.12 dm³

112 dm³

Rutherford's model of atom failed because

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The atom did not have a nucleus and electrons

It did not account for the attraction between protons and neutrons

It did not account for the stability of the atom

There is actually no space between the nucleus and the electrons

Which of the following will have the same number of molecules at STP

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280 cm³of CO₂and 280 cm³of N₂O

11.2 dm³of O₂and 32 g of O₂

44 g of CO₂and 11.2 dm³of CO

28 g of N₂and 5.6 dm³of oxygen

One of the following statements about Born-Haber cycle is correct. Which is that statement

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Born-Haber cycle is different from Hess's law

The energy change in a cyclic process is not zero

The lattice energy of the crystalline substances can be calculated easily

Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously

Which of the following can form H-bonds

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NH₃

C₂H₆

NaCI

CHCI₃

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