Question # 1

When cathode rays strike the anode metal, X-rays are emitted and not he positive rays. The reason is that cathode rays are

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Heated

Material particles

Knocked out electrons from anode that emit X-rays when outer electrons take their place.

Absorbed by the nucleus

If coefficients of a chemical equation are double , the enthalpy change will:

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be half

be double

not change

none of all above

Generally first ionization energy increases across a period. The first ionization energy of N is higher than that of O. The reason for that is

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the attractive force from the nucleus per electron is higher in N

the electron pair in one of the p orbitals of O creates a high energy system,decreasing the energy required to ionize

in oxygen the 2 electrons in 2P_xfurther shield the valence electrons thus the ionization energy is lower

N has smaller atomic radius

A gas with minimum charge to mass ratio, when cathode rays are passed through it

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Hydrogen

Oxygen

Nitrogen

Chlorine

The ratio of e/m values of a proton and anα- partical is

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2 : 1

1 : 1

1 : 2

1 : 4

The number of electrons in a given sub shell is given by formula

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2n²

2l + 1

2(2l - 1)

2(2l + 1)

The radius of first orbit of hydrogen atom

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0.329A°

0.429A°

0.529A°

0.229A°

When 3p orbital is complete, the entering electron goes into

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4s

3d

4p

4f

If volume of a system is kept constant and heat is supplied to they system then:

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internal energy of the system increases and no work is done on the surrounding

internal energy of the system increases and work is done on surrounding

no work is done on the surrounding

no change in internal energy occurs

The ΔH values for reaction C + 1/2 O₂ → CO and CO + 1/2 O₂ → CO₂ are 100 and 200 kJ respectively.The heat of reaction for C + O₂ → CO₂ will be

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50 kJ

100 kJ

150 kJ

300 kJ

Energy of a photon is related to:

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Wave number

Wave length

Frequency

All of above

P-fund, Bracket and paschen series lie in:

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Infrared region

Ultra violent region

Visible region

Microwave region

The arrangement of sodium, oxygen, fluorene and strontium on the basis of increasing first ionization energy is

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Na < Sr < O < F

Na < Sr < F < O

Sr < Na < O < F

Sr < Na < F < O

The quantum number which describes the shape of an orbital is called

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principle quantum number

azimuthal quantum number

magnetic quantum number

spin quantum number

Mass of simple electron is:

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9.1 x 10³¹kg

9.1 x 10^-30kg

1.66 x 10^-31kg

9.1 x 10^-31kg

Which rays are non-material in nature?

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β-rays

γ-rays

α-rays

cathode rays

Each electron in an atom must have its own unique set of quantum numbers. This is a statement of

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Periodic law

Aufbau principle

Pauli exclusion principle

Hund's rule

All of the following chemical reactions are endothermic except

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H₂O_(s) → H₂O_(e)

2H₂O_(g)→ 2H₂_(g)+ O_2(g)

H₂O_(g)→ H₂O_(e)

AI₂O₃ + 2Fe_(s) → 2AI_(s) +Fe₂O_3(s)

The law of lavoisier and Laplace illustrates

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The principle of conservation of energy.

Equivalence of mechanical and thermal energy

The principle of conservation of matter

Equivalent of mechanical and chemical energy

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 range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

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