2439 + Interview Questions in ATOMIC-STRUCTURE IN GENERAL AWARENESS Page 37 InterviewSolution

1801.	Which one of the following combinations will give the highest stability to a nucleus with atomic number Z and mass number NA. Even Z and odd NB. Odd Z and even NC. Even Z and even ND. Odd Z and odd N
Answer» Correct Answer - C n/p ratio is 1 in all the light stable nuclei upto calcium and there after the ratio is greater than 1 and increases up to 1.6. Nuclei that fall above the stability zone have an excess of neutrons while those lying below have more protons. Both of these cause instability. Even Z and even N give high stability to nucleus.

Discussion

1802.	Number of protons, neutrons and electrons in the element `._89^231 Y` is.A. 89,231,89B. 89,89,242C. 89,142,89D. 89,71,89
Answer» Correct Answer - C In `Y_89^231` number of protons and electrons is 89 and No. of neutrons =A -Z =231-89=142

Discussion

1803.	The mass number of a particular element which has equal number of protons and neutrons is 32. What is the electronic configuration of the atom and its stable ion ?
Answer» Mass number =32 No. of protons =No, of neutrons =16 `therefore` Electronic configuration `=2,8,6` Element is sulphur and stable ion is `S^(-2)` Electronic configuration of `S^(-2) is 2,8,8`

Discussion

1804.	Write down the (a) electronic configuration, (b) number of neutrons and (c) number of neutrons and (d) nature of the element, for the following . (1) `""_(6)X^(12)" "(2)""_(10)Y^(20)" "(3)""_(19)Z^(39)`
Answer» (i) `2n^(2)` (ii) Electrons in last orbit (iii) Mass number-atomic number

Discussion

1805.	The charge on eletron was determined byA. SchrodingerB. ChadwickC. ThomsonD. Millikan
Answer» Correct Answer - D

Discussion

1806.	The atomic numbers of elements `X,Y`,and `Z` are `19,21`, and `23`, respectively. The number of eletron present in the `M` shells of these elements follows the orderA. `Z gt X gt Y`B. `X gt Y Z`C. `Z gt Y gt X`D. `Y gt Z gt X`
Answer» Correct Answer - C

Discussion

1807.	The maximum number of electrons present in an orbit. `l = 3`, is .A. 6B. 8C. 10D. 14
Answer» Correct Answer - D (d) Azimuthal quantum number `(1) = 3` shows the presence of `f` orbit, which contain seven orbitals and each orbital have `2` electrons. Hence `7 xx 2 = 14` electrons.

Discussion

1808.	The possible number of orientations of a sun-shell is `(2 l + 1)` The possible number of electrons in a sub-shell is `(4 l + 2)`.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If assertion is false but reason is true.
Answer» Correct Answer - A (a) The value of `m` are `- 1` to `+ l` through zero, i.e., total `(2 l + 1)` orbitals and each orbital has two electrons.

Discussion

1809.	The atomic number of sodium is 11. How many protons are there in the nucleus of sodium atom ? How manu electrons does an atom of sodium contain ? How many electrons and protons does an ion of sodium which has a charge of +1 contain ?
Answer» Protons =11, electrons 11, `Na^(+)` contains 10 electrons and 11 protons

Discussion

1810.	A neutral atom of an element has a nucleus with nuclear charge 12 times and mass 24 times that of hydrogen. Calculate the number of electrons, protons and neutrons in its stable positively charged ion.
Answer» (i) Number of electrons required to be present in the valence shell of an ion so that the ion beomes stable. (ii) Subatomic particles that cause nuclear charge. (iii) Number of subatomic particles (iv) Electronic configuration of the stable ion that is formed.

Discussion

1811.	Elements of the same mass number but of different atomic number are known as ……….
Answer» Correct Answer - isobars

Discussion

1812.	Isotopes of an element differ in the number of ………in their nuclei
Answer» Correct Answer - neutrons

Discussion

1813.	The mass of a hydrogen is ..........kg.
Answer» Correct Answer - `1.66 xx 10^(-27)kg`

Discussion

1814.	The frequency of radiations emitted when electron falls from `n = 4` to `n = 1` in `H-"atom"` would be (Given `E_1` for `H = 2.18 xx 10^-18 J "atom"^-1` and `h = 6.625 xx 10^-34 Js`.)A. `1.54xx10^(15)s^(-1)`B. `1.03xx10^(15)s^(-1)`C. `3.08xx10^(15)s^(-1)`D. `2xx10^(15)s^(-1)`.
Answer» Correct Answer - C

Discussion

1815.	Neutron was discovered by ………A. J.J. ThomsonoB. ChadwickC. RutherfordD. Priestley.
Answer» Correct Answer - B

Discussion

1816.	a. What is the shape of ltbrltgt i. s orbital ii. P orbital b. Which of the following orbital are spherically symmerical ? i. `p_(x) ` ii. `s` iii. `p_(y)`
Answer» The The shape of s orbital is sherically symmetrical .The size of a orbital depends upon the principal quantum number n .The size of s orbital belonging to the second principal quantum number is biggest than the first ii. A p orbital is double shapes whose lobes point along `x-,y - or z- axes b. s orbital

Discussion

1817.	The light radiations with discrete quantities of energy are called …………
Answer» Correct Answer - Protons

Discussion

1818.	Neutron was discovered by ………
Answer» Correct Answer - James chadwick

Discussion

1819.	The number of spherical nodes in `4s` orbital isA. `4`B. `prop`C. `2`D. `3`
Answer» Correct Answer - D

Discussion

1820.	The shape of s orbital is ………white the shape of p orbital
Answer» Spherical , dumd -ball

Discussion

1821.	Which of the following statements on quantum numbers is not correct?A. Quantum numbers, n,1,m and `m_(s)` are needed to describe and electron in an atom completelyB. Quantum numbers n,l,m and s are obtained by solving the Schrodinger wave equation.C. A subshell in an atom can be designated with two quantum numbers n and 1D. The maximum value of 1 is equal to n -1 and that of m is `underline(+l)`
Answer» Correct Answer - B n,l,m represent size, shape dixection of orbital

Discussion

1822.	The ratidal part of wave function dependds on the quantum numbersA. nB. lC. `l,m_(1)`D. n only
Answer» Correct Answer - A::B

Discussion

1823.	How many spherical nodes are present in `4s` orbital in a hydrogen atom ?
Answer» Correct Answer - C Number of nodes `= n - l - 1 = 4 - 0 - 1= 3`

Discussion

1824.	The shape of the orbital is determined byA. spin quantum numberB. Magnetic quantum numberC. azimuthal quantum numberD. principal quantum number
Answer» Correct Answer - C The shape of the orbital is determined by azimuthal quantum number.

Discussion

1825.	The shape of orbital is determined by ………quantum number
Answer» Azimuthal quantum number

Discussion

1826.	Which represents and orbital ?A. `psi`B. `psi^2`C. `\| psi^2 \|psi`D. `None of these
Answer» Correct Answer - A `psi` is called wave funciton or orbital .

Discussion

1827.	Two electrons occupying the same orbital are distinguished by :A. Principal quantum numberB. azimuthal quantum numberC. magnetic quantum numberD. spin quantum number
Answer» Correct Answer - D

Discussion

1828.	The energy of an electron of `2p_(1)` orbital isA. Greater than `2p` orbitalB. Less than `2p_(x)` orbitalC. Equal to `2s` orbitalD. Sum of that of`2p_(x)` and `2p_(z)` orbital
Answer» Correct Answer - D All `2p` orbitals are degenerate

Discussion

1829.	The energy of an electron of `2p_(y)` orbital isA. greater than `2p_(x)` orbitalB. less than 2`p_(z)` orbitalC. equal to 2s orbitalD. same as that of `2p_(x) and 2p_(z)` orbital
Answer» Correct Answer - D

Discussion

1830.	The `2p_(x) ,2p_(y)` and ` 2p_(z)` orbitals of atom have identical shapes but differ in their …………A. SizeB. ShapeC. OrientationD. Spin
Answer» Correct Answer - C `m_(L)` represent orientatio of orbital

Discussion

1831.	The `2p_(x) 2p_(y)` and ` 2p_(z)`orbital of atom have identical shapes but differ in their …………
Answer» Correct Answer - Orientyations

Discussion

1832.	The `2p_(x) ,2p_(y)` and ` 2p_(z)` orbitals of atom have identical shapes but differ in their …………
Answer» Correct Answer - Orientation

Discussion

1833.	Which of the following statement is //are correct ?A. There is no probability of finding a p- electron right as the nuclessB. The orbital `d_(2)^(2)` has two libes of electron density directed along the z-axis and a ring of electron density (called dought dough not ) center is the xy- plajneC. The oriention of p and d orbital minimies electron repalsion in many electron atomD. None is correct
Answer» Correct Answer - A::B::C

Discussion

1834.	Which of the following statement is//are correct ?A. For all value of n the p orbital have the d=same shape but the overal l size in creases as n increases for a given atomB. The fact then there is a particular direction along which each p orbit has maximum electron density plsys an important rule in determining molecular grometriesC. The change closed of a single electron ibn `2 p_(x)` atomicD. None is correct
Answer» Correct Answer - A::B::C

Discussion

1835.	According to pauli erxclasion principle , the maximum number of electron that be can accomodated is an orbital is……….
Answer» Correct Answer - Two

Discussion

1836.	The total number of electron is `1. g CH_4` are :A. `N//10`B. `N`C. `2N`D. `3N`
Answer» Correct Answer - B `:. 1.4 . G CH_4` has N molecules and each molecule has `10 ` elecrons . ` :. 1.6 g CH_4 has N/(10)` molecules `= n/(100 xx 1)` electrons .

Discussion

1837.	The maxium number of electron that electron that can be accomodated in p-subshell in 3rd orbitalA. 2B. 4C. 6D. 10
Answer» Correct Answer - C

Discussion

1838.	(1) The probability of finding an electron is maxium at certain places in space (2) Energy change takes place only during excitation or deexcitation of electron (3) Electron has both particle and wave nature (4) Angular momentum of the electron revolving in different ellipticals orbits is quantised Arrange the above statements of different models or principals in the chronological order , which ultimately led to the development of modern structure of the atomA. 1,2,3,4B. 2,4,3,1C. 4,3,2,1D. 2,3,1,4
Answer» Energy change takes place only during excita-tion or deexcitation of electrons. Angular momentum of the electrons revolv-ing in different elliptical orbits is quantised. Electron has both particle and wave nature. ltbrrgt The probability of finding an electron is maxi- mum at certain places in space.

Discussion

1839.	What is the nergy difference ( in kJ `mol^(-1)`) between the first and second shell fo H-atom if the first emission in the Lyman series occurs at ` lambda = 121.5` nm ?
Answer» I line of Lyman series is due to ` E_(2) - E_(1) = Delta E` ` therefore Delta E //mol e = ( h.c.N_(A))/(lambda)` `= (6.626 xx 10^(-34) xx 3 .0 xx 10^8 xx 6.023 xx 10^(23))/(121.5 xx 10^(-9))` `= 9.85 xx 10^(5) "J mol"^(-1) = 985k "J mol"^(-1)`.

Discussion

1840.	Which of the following sets of quantum numbers represents an impossible arrangement?A. `n, 3 l, 2 , m-2 s, 1//2`B. `n, 4, l, 0 m, 0 , s, 1//2`C. `n, 4, l, 3 s, -3 1//2`D. `n5, l, 3, s0, s, 1//2`
Answer» Correct Answer - C For `l= 2` m can have values `-l ` to `+l` including zero.

Discussion

1841.	A metal surface fo threshold frequency ` 5 . 3 xx 10^(14) "src" ^(-1)`. Is exposed to a photon fo radiation having energy ` 3. 5 xx 10 ^(-19)` J will it exhibit photoelectic effect ?
Answer» ` E//"photon" = hv "or" v = ( 3.5 xx 10^(-19))/(6.626 xx 10^(-34)) ` ` = 5. 28 xx 10^(14) sec ^(-1)` Since the frequency of the radiaiton used ` v lt v_0` i.e., threshold frequency or minimum frequency to show photoelectric effect it will not show photoelectric effect .

Discussion

1842.	Show that radius fo (II) shell fo H- atom is almost four times fo (I) shell .
Answer» `therefore r_n prop n^2` Thus ` r_1 prop 1^2` and ` r_2 prop 2^2` `therefore r_2 = 4 xx r_1` .

Discussion

1843.	The ratio of speed of gamma-rays and X-rays is :A. `1`B. `lt1`C. >1D. None of these
Answer» Correct Answer - A Both are wavers of radint energy .

Discussion

1844.	Which fo the following product in a hdrogen atom are independent fo the principal quantum bumber (n) ?A. `v_n`B. `E_r`C. `E_n`D. `v_r`
Answer» Correct Answer - A::B

Discussion

1845.	Which of the following does not characteristic X -rays ?A. The radistiaon can ionise gaseB. It causes ` ZnS` to fluoresecenceC. Defected by electroic or magentic fieldD. Have wavelength shorter than the UV rays
Answer» Correct Answer - C X-rays are electromagnetic waves and carry no chare .

Discussion

1846.	Which of the following does not characteristic X -rays ?A. The radiation can ionise gasesB. It causes `ZnS` to fluoresceC. Deflected by electric and magnetic fieldsD. Have wavelengths shorter than ultraviolet rays
Answer» Correct Answer - C

Discussion

1847.	If `lambda_(1)` and `lambda_(2)` are the wavelength of characteristic `X` - rays and gamma rays respectively , then the relation between them isA. `lambda_(1) = (1)/(lambda_(2))`B. `lambda_(1) = lambda_(2)`C. `lambda_(1) gt lambda_(2)`D. `lambda_(1) lt lambda_(2)`
Answer» Correct Answer - C more energy less wave length

Discussion

1848.	Proton isA. Nucleus of deuteriumB. Ionised hydrogen moleculeC. Ionised hydrogen atomD. An `alpha-"particle"`
Answer» Correct Answer - C ( c) Proton is ionised hydrogen atom, i.e., `H^+`.

Discussion

1849.	Which of the following does not characteristic X -rays ?A. The radiation can ionize gasesB. It causes `ZnS` to fluorescenceC. Deflected by electric and magnetic fieldsD. Have wavelengths shorter than ultraviolet rays.
Answer» Correct Answer - C ( c) `X-rays` can ionize gases and cannot get deflected by electric and magnetic fields, wavelength of these rays is `150` to `0.1 Å`. Thus the wavelength of `X-rays` is shorter than that of `UV` rays.

Discussion

1850.	The electron in a hydrogen atom makes a transition ` n_1 rar n_2` wher `n_1` and ` n_2` are the principal quuantum numbers fo the two states . Assume the Bohr model to gbe veloid the time pertiod fo the electron in the initial state is eight times that tin the final state . The posible velues of ` n_1` and `n_2` are :A. ` n_1 =4, n_2 =2`B. `n_1 =8, n_2 =2`C. ` n_1 =8,n_2 =1`D. `n_1 = 6, n_2 =3`
Answer» Correct Answer - A::D

Discussion

Explore topic-wise InterviewSolutions in .

Which one of the following combinations will give the highest stability to a nucleus with atomic number Z and mass number NA. Even Z and odd NB. Odd Z and even NC. Even Z and even ND. Odd Z and odd N

Number of protons, neutrons and electrons in the element `._89^231 Y` is.A. 89,231,89B. 89,89,242C. 89,142,89D. 89,71,89

The mass number of a particular element which has equal number of protons and neutrons is 32. What is the electronic configuration of the atom and its stable ion ?

Write down the (a) electronic configuration, (b) number of neutrons and (c) number of neutrons and (d) nature of the element, for the following . (1) `""_(6)X^(12)" "(2)""_(10)Y^(20)" "(3)""_(19)Z^(39)`

The charge on eletron was determined byA. SchrodingerB. ChadwickC. ThomsonD. Millikan

The atomic numbers of elements `X,Y`,and `Z` are `19,21`, and `23`, respectively. The number of eletron present in the `M` shells of these elements follows the orderA. `Z gt X gt Y`B. `X gt Y Z`C. `Z gt Y gt X`D. `Y gt Z gt X`

The maximum number of electrons present in an orbit. `l = 3`, is .A. 6B. 8C. 10D. 14

The atomic number of sodium is 11. How many protons are there in the nucleus of sodium atom ? How manu electrons does an atom of sodium contain ? How many electrons and protons does an ion of sodium which has a charge of +1 contain ?

A neutral atom of an element has a nucleus with nuclear charge 12 times and mass 24 times that of hydrogen. Calculate the number of electrons, protons and neutrons in its stable positively charged ion.

Elements of the same mass number but of different atomic number are known as ……….

Isotopes of an element differ in the number of ………in their nuclei

The mass of a hydrogen is ..........kg.

The frequency of radiations emitted when electron falls from `n = 4` to `n = 1` in `H-"atom"` would be (Given `E_1` for `H = 2.18 xx 10^-18 J "atom"^-1` and `h = 6.625 xx 10^-34 Js`.)A. `1.54xx10^(15)s^(-1)`B. `1.03xx10^(15)s^(-1)`C. `3.08xx10^(15)s^(-1)`D. `2xx10^(15)s^(-1)`.

Neutron was discovered by ………A. J.J. ThomsonoB. ChadwickC. RutherfordD. Priestley.

a. What is the shape of ltbrltgt i. s orbital ii. P orbital b. Which of the following orbital are spherically symmerical ? i. `p_(x) ` ii. `s` iii. `p_(y)`

The light radiations with discrete quantities of energy are called …………

Neutron was discovered by ………

The number of spherical nodes in `4s` orbital isA. `4`B. `prop`C. `2`D. `3`

The shape of s orbital is ………white the shape of p orbital

The ratidal part of wave function dependds on the quantum numbersA. nB. lC. `l,m_(1)`D. n only

How many spherical nodes are present in `4s` orbital in a hydrogen atom ?

The shape of the orbital is determined byA. spin quantum numberB. Magnetic quantum numberC. azimuthal quantum numberD. principal quantum number

The shape of orbital is determined by ………quantum number

Which represents and orbital ?A. `psi`B. `psi^2`C. `| psi^2 |psi`D. `None of these

Two electrons occupying the same orbital are distinguished by :A. Principal quantum numberB. azimuthal quantum numberC. magnetic quantum numberD. spin quantum number

The energy of an electron of `2p_(1)` orbital isA. Greater than `2p` orbitalB. Less than `2p_(x)` orbitalC. Equal to `2s` orbitalD. Sum of that of`2p_(x)` and `2p_(z)` orbital

The energy of an electron of `2p_(y)` orbital isA. greater than `2p_(x)` orbitalB. less than 2`p_(z)` orbitalC. equal to 2s orbitalD. same as that of `2p_(x) and 2p_(z)` orbital

The `2p_(x) ,2p_(y)` and ` 2p_(z)` orbitals of atom have identical shapes but differ in their …………A. SizeB. ShapeC. OrientationD. Spin

The `2p_(x) 2p_(y)` and ` 2p_(z)`orbital of atom have identical shapes but differ in their …………

The `2p_(x) ,2p_(y)` and ` 2p_(z)` orbitals of atom have identical shapes but differ in their …………

According to pauli erxclasion principle , the maximum number of electron that be can accomodated is an orbital is……….

The total number of electron is `1. g CH_4` are :A. `N//10`B. `N`C. `2N`D. `3N`

The maxium number of electron that electron that can be accomodated in p-subshell in 3rd orbitalA. 2B. 4C. 6D. 10

What is the nergy difference ( in kJ `mol^(-1)`) between the first and second shell fo H-atom if the first emission in the Lyman series occurs at ` lambda = 121.5` nm ?

Which of the following sets of quantum numbers represents an impossible arrangement?A. `n, 3 l, 2 , m-2 s, 1//2`B. `n, 4, l, 0 m, 0 , s, 1//2`C. `n, 4, l, 3 s, -3 1//2`D. `n5, l, 3, s0, s, 1//2`

A metal surface fo threshold frequency ` 5 . 3 xx 10^(14) "src" ^(-1)`. Is exposed to a photon fo radiation having energy ` 3. 5 xx 10 ^(-19)` J will it exhibit photoelectic effect ?

Show that radius fo (II) shell fo H- atom is almost four times fo (I) shell .

The ratio of speed of gamma-rays and X-rays is :A. `1`B. `lt1`C. >1D. None of these

Which fo the following product in a hdrogen atom are independent fo the principal quantum bumber (n) ?A. `v_n`B. `E_r`C. `E_n`D. `v_r`

Which of the following does not characteristic X -rays ?A. The radistiaon can ionise gaseB. It causes ` ZnS` to fluoresecenceC. Defected by electroic or magentic fieldD. Have wavelength shorter than the UV rays

Which of the following does not characteristic X -rays ?A. The radiation can ionise gasesB. It causes `ZnS` to fluoresceC. Deflected by electric and magnetic fieldsD. Have wavelengths shorter than ultraviolet rays

If `lambda_(1)` and `lambda_(2)` are the wavelength of characteristic `X` - rays and gamma rays respectively , then the relation between them isA. `lambda_(1) = (1)/(lambda_(2))`B. `lambda_(1) = lambda_(2)`C. `lambda_(1) gt lambda_(2)`D. `lambda_(1) lt lambda_(2)`

Proton isA. Nucleus of deuteriumB. Ionised hydrogen moleculeC. Ionised hydrogen atomD. An `alpha-"particle"`

Which of the following does not characteristic X -rays ?A. The radiation can ionize gasesB. It causes `ZnS` to fluorescenceC. Deflected by electric and magnetic fieldsD. Have wavelengths shorter than ultraviolet rays.