ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

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Question # 1

Rutherford's model of atom failed because:

Question # 2

Smallest charge of electricity that has been measured so far is

Question # 3

The orbital in Rutherford's model is

Question # 4

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 5

What is the packet of energy called?

Question # 6

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 7

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 8

The range of visible spectrum is

Question # 9

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 10

When 6s orbital is complete then next electron goes to

Question # 11

When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as

Question # 12

Rutherford's planetary like picture of the atomic modal was defective because

Question # 13

The degenerate orbitals p-sub shell are

Question # 14

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 15

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 16

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 17

Cathode rays emitted from cathode are

Question # 18

Charge to mass ratio of electron was discovered by:

Question # 19

Which one of the following statements is true about discovery of neutrons?

Question # 20

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 21

The charge of an electron is determined by

Question # 22

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 23

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

Question # 24

1 erg of energy corresponds to

Question # 25

Which is not true with respect to cathode rays?

Question # 26

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 27

The maximum number of electrons in a subshell for which l = 3 is

Question # 28

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 29

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 30

A 4f orbital has

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25
A. 3.0 BM
B. 4.9 BM
C. 5.9 BM
D. 6.9 BM
2 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
3 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron
4 When electrons revolve in stationary orbits
A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy
5 The four quantum numbers of the valency electron of potassium are
A. 4,1,1,1/2
B. 4,0,0,1/2
C. 4,1,0,1/2
D. 4,4,0,1/2
6 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
7 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron
8 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
9 The electronic configuration of an atom/ion can be defined by the following
A. Aufbau principle
B. Pauli's exclusion principle
C. Hund's Rule
D. All the above
10 Energy of electron in first orbit of H atom is
A. -45.32 KJ/mole
B. -82.08 KJ/mole
C. -52.53 KJ/mole
D. -1313.31 KJ/mole

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