Question # 1

The series of lines produced when electron falls from higher energy levels n₂= 2,3,4,5, .......... to n₁= 1 is called

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Balmer series

Paschen series

Pfund series

Lyman series

n + l value for 4f will

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2

5

7

9

The unit ergs joule and calorie are inter-convertible which of following is incorrect

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107 rgs = 1j

4.184j = 1 cal

1 j = 0.2390 cal

1 erg = 4.184 cal

Thermodynamics is concerned with

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Total energy of a system

Rate of a chemical change

Energy changes in a system

Mass changes in nuclear reactions

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

The radius of the second orbit is

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2.11 x 10^-11m

1.006 A°

2.1A°

2.11 x 10^-12m

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

Charge to mass ratio (e/m) of the electron is determined by

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R.A Millikan

J.J Thompson

G.J Stoney

None of these

A cylinder of gas supplied by PSO is assumed to contain 14 kg of butane.If a normal family requires 20,000 kJ of energy per day for cooking butane gas in the cylinder last for .....days (Δ H_c of C₄H₁₀ = -2658 kJ per mole)

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15 days

20 days

50 days

32 days

The amount of heat evolved or absorbed in a chemical reaction when represented in a chemical equation is called:

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entropy of a reaction

free energy of reaction

heat of reaction

none of above

The value of R (Rydberg's constant) is _____________ m^-1

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1.0974 x 10⁷

1.0842 x 10⁷

1.082 x 10^-7

Both a and b

The possible number of orbitals in level with n = 3 is

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1

3

4

9

The nature of positive rays depend on:

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Nature of discharge tube.

Nature of resident gas.

Nature of electrode.

All of above.

Orbitals having same enrgy are called

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Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Thermochemistry is the study of chemical reaction accompanying

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Mass change

rate change

heat change

vol change

If Aufbau rule is not followed in filling of the sub-shells then the block of which will change in the periodic table

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K (19)

Sc (21)

V (23)

Ni (28)

Splitting of spectral lines of the hydrogen atom under the influence of magnetic field is called

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stark effect

zeeman effect

Compton effect

photoelectric effect

If uncertainty in position of electron is zero, the uncertainty in its momentum would be:

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Also zero

50%

Less than zero

Infinite

The range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

Which of the following values of heat of formation indicates that the product is most stabel

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-97 kj

-231.6 kj

+21.4 kj

+70 kj

Charge on electron was discovered by:

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Millikan

Crook

Neil Bohr

Rutherford

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