Question # 1

The nature of bond in diamond is

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Electrovalent

Metallic

Coordinate covalent

Covalent

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

Which of the following wave properties is inversely proportional to the energy for electromagnetic radiations

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Frequency

Wave number

Velocity

Wave length

Rutherford's model fo 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

Their is actually no space between the nucleus and the electrons.

Maximum number of electrons in f-subshell is.

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2

6

10

14

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The mass of alpha particle is equal to.

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Four times the mass of one proton

That of one hydrogen atom

That of one electron

That of one proton

In which de excitation of electron of hydrogen atom maximum energy is relaeased.

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From n2 to n1

From n3 to n2

From na to n1

From na to n2

The change in heat energy of a chemical reaction at constant temperature and pressure is called

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Enthalpy change

Bond energy

Heat of sublimation

Internal energy change

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

If fluted fitter paper, rate of filtration increases as compared tot he cone shaped filter paper because.

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It has greater number of holes in it.

It has greater surface are of filtration

Fluted filter paper has greater pore sizes than cone shaped filter paper.

Thickness of paper is more than cone shaped filter paper

The sum of all kinds of energies of atoms, ions or molecules of a system is known as.

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Kinetic energy

Potential energy

Internal energy

Solar energy

Isotopes are the atoms of same element with similar chemical properties but different

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Atomic number

Atomic volume

Atomic weight

Atomic structure

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

The cathodic reaction in the electrolysis of dil H2SO4 with Pt electrodes is.

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Reduction

Oxidation

Both oxidation or reduction

Neither oxidation nor raduction

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

The number of H2O molecules in 9 grams of ice is

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3.01 x 10²³

6.02 x 10²³

6.02 x 10⁸

12.04 x 10²³

If an endothermic reaction is allowed to take place very rapidly i the air, the temperature fo the surrounding air.

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Remains constant

Increase

Decrease

Remain unchanged

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