Structure of Atom Test

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Structure of Atom Test - 14

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Question 1
1 / -0

A neutral atom (Atomic no. > 1) consists of

A
Only protons

B
Neutrons + protons

C
Neutrons + electrons

D
Neutron + proton + electron

Solution

Neutrons and protons in the nucleus and electrons in the extranuclear region.
Question 2
1 / -0

The nucleus of the atom consists

A
Proton and neutron

B
Proton and electron

C
Neutron and electron

D
Proton, neutron and electron

Solution

It consists of proton and neutron and these are also known as nucleons.
Question 3
1 / -0

The size of nucleus is of the order of

A
\(10^{-12}\)

B
\(10^{-8}\)

C
\(10^{-15}\)

D
\(10^{-10}\)

Solution

Radius of nucleus \(\sim\,10^{-15}\)
Question 4
1 / -0

The fundamental particles present in the nucleus of an atom are

A
Alpha particles and electrons

B
Neutrons and proton

C
Neutrons and electrons

D
Electrons, neutrons and protons

Solution

Neutron and proton found in nucleus.
Question 5
1 / -0

One would expect proton to have very large

A
Ionization potential

B
Radius

C
Charge

D
Hydration energy

Solution

\(H^+ \)(proton) will have very large hydration energy due to its very small ionic size.

Hydration energy \(\propto\,1/Size.\)
Question 6
1 / -0

Ratio of masses of proton and electron is

A
Infinite

B
\(1.8\,\times\,10^3\)

C
1.8

D
None of these

Solution

\(\frac{m_p}{m_e} = 1837 =\) \(1.8\,\times\,10^3\)
Question 7
1 / -0

What is the ratio of mass of an electron to the mass of a proton

A
1 : 2

B
1 : 1

C
1

D
1 : 3

Solution

Electron \(\frac{1}{1837}\) time lighter than proton so their mass ratio will be 1 : 1837
Question 8
1 / -0

The number of electrons in one molecule of \(CO_2\) is

A
22

B
44

C
66

D
88

Solution

One molecule of \(CO_2\) has 22 electrons.
Question 9
1 / -0

An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be

A
26

B
30

C
36

D
56

Solution

\(_{26}X^{56}\) A = P+ N =Z + N = E+ N + N = A−E

= 56−26

= 30
Question 10
1 / -0

An atom has the electronic configuration of \(1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^{10},4s^2 4p^5.\) Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be

A
35 and 45

B
45 and 35

C
40 and 40

D
30 and 50

Solution

\(_{35}Br^{80}\) =  \(1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^{10},4s^2 4p^5.\)

A = 80, Z = 35, N =?

N = A − Z

= 80 − 35

= 45

Atomic number (Proton) is 35 and no. of neutron is 45.
Question 11
1 / -0

Which of the following particles has more electrons than neutrons?

A
C

B
\(F^-\)

C
\(O^{-2} \)

D
\(Al^{+3}\)

Solution

\(O^{-2}\) has more electrons than neutrons.
Question 12
1 / -0

Principal, azimuthal and magnetic quantum numbers are respectively related

A
Size, shape and orientation

B
Shape, size and orientation

C
Size, orientation and shape

D
None of the above

Solution

n, l and m are related to size, shape and orientation respectively.
Question 13
1 / -0

Isoelectronic species are

A
\(K^+,cl^-\)

B
\(Na^+, Cl^-\)

C
\(Na, Ar \)

D
\(Na^+, Ar\)

Solution

\(K^+\) = \(1s^22s^22p^63s^23p^6\)

\(Cl^-\) = \(1s^22s^22p^63s^23p^6\)
Question 14
1 / -0

\(CO_2\) is isostructural with

A
\(SnCl_2\)

B
\(SO_2\)

C
\(HgCl_2\)

D
All the above

Solution

O=C=O, linear structure 180° angle

Cl−Hg−Cl, linear structure 180° angle.
Question 15
1 / -0

Which of the following expressions gives the de-Broglie Relationship?

A
\(h = {\lambda\over{mv}}\)

B

\(\lambda={ h\over{mv}} \)

C
\(\lambda={ m\over{hv}}\)

D
\(\lambda={ v\over{mh}}\)

Solution

According to de-Broglie equation

\(\lambda={ h\over{mv}}\) ,p = mv, \(\lambda={ h\over{p}}\) ,\(\lambda={ h\over{mc}}\)
Question 16
1 / -0

Minimum de-Broglie wavelength is associated with

A
Electron

B
Proton

C
\(CO_2\) molecule

D
\(SO_2\) molecule

Solution

\(SO_2\) molecule has least wavelength because their molecular mass is high.
Question 17
1 / -0

The de-Broglie equation applies

A
To electrons only

B
To neutrons only

C
To protons only

D
All the material object in motion

Solution

The de-Broglie equation applies to all the material object in motion.
Question 18
1 / -0

The Bohr's energy equation for H atom reveals that the energy level of a shell is given by \( E = -13.58/n^2eV. \)The smallest amount that an H atom will absorb if in ground state is

A
1.0 eV

B
3.39 eV

C
6.79 eV

D
10.19 eV

Solution

The smallest value of energy of an electron in H atom in ground state can absorb is \(= E_2\,-\,E_1\)

\(\)\(-13.58\over 4\) - \(\Big(\frac{-13.58}{1}\Big)\) = 10.19
Question 19
1 / -0

What is the maximum wavelength line in the Lyman series of \(He^+\) ion?

A
3R

B
\(\frac{1}{3}R\)

C
\(\frac{4}{4}R\)

D
None of these

Solution

\(\frac{1}{\lambda}\) = \(RZ^2\)\(\Big[\frac{1}{n_1^2} - \frac{1}{n_2^2}\Big]\)

\(R\,\times\,2^2 \Big[\frac{1}{1^2} - \frac{1}{2^2}\Big]\)

\(\implies 3R;\lambda\) = \(\frac{1}{3R}\)

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Structure of Atom Test - 14

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Structure of Atom Test - 14

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Question 1

Only protons

Neutrons + protons

Neutrons + electrons

Neutron + proton + electron

Solution

Question 2

Proton and neutron

Proton and electron

Neutron and electron

Proton, neutron and electron

Solution

Question 3

\(10^{-12}\)

\(10^{-8}\)

\(10^{-15}\)

\(10^{-10}\)

Solution

Question 4

Alpha particles and electrons

Neutrons and proton

Neutrons and electrons

Electrons, neutrons and protons

Solution

Question 5

Ionization potential

Radius

Charge

Hydration energy

Solution

Question 6

Infinite

\(1.8\,\times\,10^3\)

1.8

None of these

Solution

Question 7

1 : 2

1 : 1

1

1 : 3

Solution

Question 8

22

44

66

88

Solution

Question 9

26

30

36

56

Solution

Question 10

35 and 45

45 and 35

40 and 40

30 and 50

Solution

Question 11

C

\(F^-\)

\(O^{-2} \)

\(Al^{+3}\)

Solution

Question 12

Size, shape and orientation

Shape, size and orientation

Size, orientation and shape

None of the above

Solution