Question # 1

Which particle has a mass 1/1836 time, that of hydrogen.

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Proton

Positron

Electron

Neutron

At constant volume of a system remains constant and the heat is absorbed by the system, them amount of heat absorbed is called

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Enthaply change of the system

Internal energy change of the system

Total enthalphy of the system

Total internal energy of the system

Vapour pressure of a substance does not depend upon.

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Temperature

Intermolecular forces

Surface area

Physical state of water

A chemical change always involve

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Absorption of heat

Evolution of heat

Either absorption or evolution of heat

The liberation of heat and light energy

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

Which one of the following has the greater ionic characters in it.

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HF

HCl

H2O

H2

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

A cell in which electric current is produced as a result of spontaneous redox reaction is called.

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Electrolytic cell

Galvanic cell

Half cell reaction

Down's cell

The total number of protons and neutrons present in the nucleus of an atom is called.

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Mass number

Atomic number

Molecular mass

Relative atomic mass

The reduction potential of Zn is.

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+0.76 V

-0.34 B

+0.34 V

-0.76 V

Bohr's model of atom is contradicted b y.

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Planck quantum theory

Quantization of energy of electrons

Heisenberg's uncertainty principle

Quantization of angular momentum

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

The volume occupied by 16 g of CH4 at S.T.P.

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224.14 dm3

22.4 dm3

1.12 dm3

2.24 dm3

n+1 value of 6d orbital is.

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08

09

10

18

Which of the following will have the same number of molecule at STP.

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280 cm3 CO2 and 280 cm3 of N2O

11.2 dm3 of O2 and 32 g of O2

44 g of CO2 and 11.2 dm3 of CO

28 g of N2 and 5.6 dm3 of oxygen

During the process of crystallization, the hot saturated solution.

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Is cooled very slowly to get large sized crystals.

Is cooled at a moderate rate to get medium sized crystals

Is evaporated to get the crystals of the product.

Is mixed with an immiscible liquid to get the pure crystals of the product.

When atoms are subjected to strong electric field, splitting of spectral lines is called.

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Zeeman effect

stark effect

Photoelectric effect

Compton effect

Molecular crystals are generally

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Hard

Relatively soft

Unstable

do not exist

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