Question # 1

Value of R (rydberg's constant)

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1.09678 x 10⁷m

1.09678 x 10⁷cm^-1

1.09678 x 10⁷cm

1.09678 x 10⁷cm^-1

Bohr model of atom does not explain

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Stark effect

Zeeman effect

Origin of line in H₂spectrum

All these

Pauli's principle is applicable to

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Degenerate orbitals

Two electrons in the same orbital

One electron

None

In which of the following change entropy decreases

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Crystallization of sucrose in water

Melting of ice

Dissolving sucrose in water

Vaporization of camphor

Thermochemistry is the study of chemical reaction accompanying

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Mass change

rate change

heat change

vol change

Positive rays produce in discharge tube from

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Electricity

Gas molecule

Anode

Cathode

Point out the orbitals which are degenerate in a multi electron atom

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1s, 2s orbitals

2d orbitals

3s, 3p, 3d orbitals

3d orbitals

If at 298 K the bond energies of C-H,C-C,C=C and H-H bonds are respectively 414, 347,and 435 kJ mol-1 the value of enthalpy change for the reaction H₂C = CH₂ (g) + H₂(g) → H₃C - CH₃(g) at 298 K will be

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+250 kJ

-250 kJ

+125 kJ

-125 kJ

Which have better penetrating power

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Alpha rays

Beta rays

Gamma rays

X-rays

Which of the following was discovered first:

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Charge to mass ratio of electrons

Mass of electron

Charge of electron

All of above at same time

A material or a collection of materials which is under study is called:

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system

state function

surrounding

substance

A gas contained in a cylinder fitted with piston constitute

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An open system

A heterogeneous system

A closed system

An isolated system

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

The amount of energy released when an isolated atom gains e to form an anion is called

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ionization potential

electronegatively

electron affinity

free energy

Glow is produced due to

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Electronic current

Gas molecule

Anode

Cathode

n + l value for 4f will

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2

5

7

9

Hund's rule states that when electrons enter to the same sub-levels they are:

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Singly occupied with different spins.

Doubly occupied with different spins.

Singly occupied with same spins.

Doubly occupied with same spins.

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

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enthalpy change

bond energy

heat of sublimation

internal energy change

In region in space, around the nucleus in an atom, where the probability of finding an electron is maximum is called.

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An orbital

An orbit

A shell

A wave

If the value of n = 4, the number of possible values of " l "

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2

3

4

5

According to the Aufbau principle the electrons and added first to the orbital:

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In sub-levels of zero energy

In sub-levels of highest energy

In sub-levels oflowest energy

of no shell

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