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

Which of the following is not a property of cathode rays. These rays

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Comprise neutron particles

Can produce X-rays when they strike a heavy metal anode

Can cause reduction reaction

Produce fluorescence in rare earth and mineral

An element with electronic configuration 1s²,2s²,2p⁶,3s²is

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metal

non-metal

inert gas

a liquid

Pauli's principle is applicable to

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Degenerate orbitals

Two electrons in the same orbital

One electron

None

According to Heisenberg uncertainty principle, maximum number of electrons an orbital can accommodate is

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2

1

0

3

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

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Hund's rule

Pauli exclusion principle

Aufbau principle

Mosley's law

Arrangement of the fundament particles within an atom determines its

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physical properties

chemical properties

physical and chemical properties

no properties

Positive rays produce in discharge tube from

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Electricity

Gas molecule

Anode

Cathode

Amount of heat evolved when one mole of a substance is completely burnt in excess of oxygen under standard conditions is called

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Enthalpy of neutralization

Enthalpy of combustion

Enthalpy of solution

Enthalpy of atimization

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

What is the entropy change (in JK^-1 mo^l-1) when one mole of ice is converted into water at 0°C?(The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol^-1 at 0°C)

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21.98

20.13

2.013

2.198

The atomic radii of elements lie in the order of

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10⁸cm

10^-12cm

10^-8cm

10¹²cm

When 6d orbital is complete, the entering electron goes into

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7f

7s

7p

7d

For an exothermic reaction the sigh of enthalpy will be :

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zero

negative

positive

none of these

when 6d orbital is complete, the entering electron goes into:

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7f

7s

7p

7d

The set of quantum numbers which represents the highest energy of an electrons

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n = 3, l = 1, m = 1, s = +1/2

n = 3, l = 2, m = 1 , s = +1/2

n = 4, l = 0, m = 0, s = +1/2

n = 4, l = 3, m = +1, s = 0

Point out the unit which does not belong to wave number?

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mm^-1

cm^-1

cm

dm^-1

A spontaneous change means:

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a lowering of free energy

a lowering of energy

an increase in internal energy

no energy change

As the quantum number n increases, the energy difference between adjacent energy level.

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Decreases

Increases

Remains fluctuating

Remains same

The letter s,p,d,f are used to represent which quantum number

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Azimuthal

Spin

Principle

Magnetic

Quantum number values for 2p orbitals are

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n = 1, l = 2

n = 1, l = 0

n = 2, l = 0

n = 2, l = 1

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