Question # 1

In the ground state of an atom the electron is present.

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In the nuclsus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

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

Which of the following statements is not correct regarding bonding molecular orbitals

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Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

Bonding molecular orbitals are formed when the electron waves undergo constructive interference

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

The paper at which separation of solute have been taken place is called.

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Retardation factor

Chromatogram

Base line

Solvent front

What happens to the enthalpy change when the coeffficients of a chemical equation are douubled

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It doubles

It becomes half

It does not change

It cannot be predicted

A glass is full of water and contains 6.02 x 10²³molecules of H2O The mass of water molecules is.

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18 gm

90 g

120 g

180 g

In silver oxide battery, anode is made of.

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Zinc

Copper

Lead

Graphite

The oxidation of O -atom in OF3 is.

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-2

+2

-1

+1

The molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

The unit of the rate constant is same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Which one of the following is not property of a good solvent.

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It should be inexpensive

It should dissolve impurities easily

It should dissolve large amount of solute at boiling point and less amount of solute at low temperature.

It should not react chemically with solute

The separation of the different isotopes in the mass spectrometer is done on the basis of

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Different amounts of positive changes

Charge e/m value different amounts of negative changes

Different m/e value

Velocities of the ions

Which is not decay product of free neutron

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Proton

Electron

Neutron

Antineutrino

Density of a gas is usually expressed in

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kg m-3

kg dm-3

g dm-3

g cm-3

Which element has highest ionization potential.

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Li

B

Be

C

In methanol, bond between carbon and oxygen.

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Ionic

Non polar

Polar

Co - ordinate

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

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