Question # 1

Which of the following molecules has zero dipole moment

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NH₃

CHCI₃

H₂O

BF₃

In zero order reaction, the rate is independent of.

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Temperature of reaction

Concentration of reactants

concentration of products

None of these

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

Unit of mole fraction is

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mol dm-3

mol kg-1

g dm-3

No unit

Colligative properties are the properties of.

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Dilute solution which behave as nearly ideal solutions

Concentrated solutions which behave as nearly non ideal solutions

Both a and b

Neither a nor b

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideal behaviour of gases

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At high pressure, the gas molecules move in one direction only

At high pressure, the collisions between the gas molecules are increased

At high pressure, the volume of the gas becomes insignificant

At high pressure, the intermolecular attraction becomes significant

What type of bonding is present in NH4Cl

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Ionic

Covalent

Co ordinate covalent

All of these

Which bond has more ionic characters in it.

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C - F

N - F

O - F

F - F

Equal masses of methane and oxygen are mixed in an empty container at 25°C, the fraction of total pressure exerted by oxygen is

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1/3

8/9

1/9

16/17

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

Bromine has isotopes

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2

4

8

6

Bond energy depends upon

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Electronegativity

Size of atom

Bond length

All of these

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

When aqueous NaCl is electrolyzed, which of the following ions gas discharged at anode.

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Cl-

OH-

Na+

H+

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

A solution has pH zero. Its H+ ions concertation will

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zero

More than unity

Less than unity

Unity only

Partial pressure of oxygen in the air is.

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156 torr

157 torr

158 torr

159 torr

In zero order reaction the rate is independent of.

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Temperature of reaction

Concentration of reactants

Concentration of products

None of these

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