Question # 1

1 mole of H₂SO₄ is mixed with 2 moles of NaOH.The heat evolved will be

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57.3 kJ

2 x 57.3 kJ

57.3/2 kJ

Cannot be predicted

Velocity of photon is

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Independent of wavelength

Depend on source

Depend on wavelength

Equal to square of amplitude

Which of the following value of ΔHf represent that the product is least stable?

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-94.0 kcal mol^-1

-231.6 kcal mol^-1

+21.4 kcal mol^-1

+64.8 kcal mol^-1

The principle quantum number describes

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the distance form the nucleus

the shape of the orbital

the orientation of the orbital

the spin of the electron

Anode is the surface on which probability of finding electron is:

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50%

Less then 10%

More then 95%

Zero

The apparatus used to measure the enthalpy of combustion of a substance, is:

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glass calorimeter

copper calorimeter

bomb calorimeter

all above

Which of the following is not a property of cathode rays

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they can produce x-rays when they strike a heavy metal anode

they can cause reduction reaction

they produce fluorescences in rare earth and minerals

they comprise neutral particles

Which one of the following particles has a mass 1/1836 time, that of hydrogen?

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Neutron

Proton

Electron

Postron

The orbitals having n + 1 = 5 are

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2p, 3d, 3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

^{When a bonds breaks:}

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heat is absorbed

temperature increases

heat is evolved

no change in heat contents takes place

The energy required to break 1 mole of bonds of from neutral atom is:

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bond energy

bond strength

bonds length

nine of all

Bohr's model of atom explains spectrum of:

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H like species only

H atom only

H and H like species

None of aove

An electron moving in orbit having principle quantum number 4 & azimuthal quantum 2, then subshell will be

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4p

4d

4f

5s

Quantum number value for 2p orbitals are:

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n = 2, I = 1

n = 1, I = 2

n = 1, I = 0

n = 2, I = 0

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

The radius of first orbit of hydrogen atom

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0.329A°

0.429A°

0.529A°

0.229A°

The total values of magnetic quantum number of subshell are five, the subshell is

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s-subshell

p-subshell

d-subshell

f-subshell

In Millikan oil-drop experiment, the charges on several different oil drops were as: -5.92, -4.44, -2.96, -8.88. The units are orbitrary. Choose the likely value of the electronic charge in these orbitrary units

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-1.11

-1.48

-2.22

-2.96

Which of the following transition in H-atom corresponds to absorption line of highest frequency?

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n = 1 to n = 2

n = 3 to n = 4

n = 2 to n = 1

n = 2 to n = 3

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

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5 x 10^-9

5 x 10^-12

5 x 10^-6

5 x 10^-10

Which substance have ΔE = ΔH and no pressure volume work

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Liquids only

Solids only

Gases only

Liquid and solids

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