QBManager

CHEMISTRY(KCET)

285232 Consider the following sets of quantum numbers:
Which of the below setting is not permissible arrangement of electrons in an atom?

1

n = 4

,

l = 0

,

m = 0

,

s = - \frac{1}{2}

2

n = 5

,

l = 3

,

m = 0

,

s = + \frac{1}{2}

3

n = 3

,

l = 2

,

m = - 2

,

s = - \frac{1}{2}

4

n = 3

,

l = 2

,

m = - 3

,

s = + \frac{1}{2}

Explanation:

(d) For a given value of ' $l$ 'the permissible values of ' $m$ ' are $- l, - (l - 1)$ $(l - 1), l$
Thus, for $l = 2, m$ cannot have a value of -3 .

Karnataka CET 2016

CHEMISTRY(KCET)

285233 The two electrons have the following sets of quantum numbers:

$P = 3, 2, - 2, + \frac{1}{2} : Q = 3, 0, 0, + \frac{1}{2}$
Which of the following statements is true?

1 P has greater energy thanQ .

2 P and Q represent same electron.

3

P

and

Q

have same energy.

4 P has lesser energy than Q.

Explanation:

(a) From the given quantum numbers, it can be inferred that:
P electron belongs to $3 d$ orbital.
Q electron belongs to $3 s$ orbital.
Hence, P has greater energy than Q .

Karnataka CET 2015

CHEMISTRY(KCET)

285234 Among the elements from atomic number 1 to36 , the number of elements which have an unpaired electron in their $s$ -subshell is

1 4

2 7

3 6

4 9

Explanation:

(c) $_{1} H = 1 s^{1};_{3} Li = 2 s^{1};_{11} Na = 3 s^{1}$ ;
$_{19} K = [Ar] 4 s^{1};_{24} Cr = [Ar] 3 d^{5} 4 s^{1}$
$_{29} Cu = [Ar] 3 d^{10} 4 s^{1}$

Karnataka CET 2014

CHEMISTRY(KCET)

285235 The statement that is not correct is

1 angular quantum number signifies the shape of the orbital

2 energies of stationary states in hydrogen like atoms is inversely proportional to the square of the principal quantum number

3 total number of nodes for 3 s orbital is three

4 the radius of the first orbit of

{He}^{+}

is half that of the first orbit of hydrogen atom.

Explanation:

(c) No. of nodes for any orbital
$= n - l - 1$
For 3 s -orbital, $n = 3$ and $l = 0$
Hence, no. of nodes for 3 s -orbital
$= 3 - 1 = 2$

Karnataka CET 2014

CHEMISTRY(KCET)

285232 Consider the following sets of quantum numbers:
Which of the below setting is not permissible arrangement of electrons in an atom?

1

n = 4

,

l = 0

,

m = 0

,

s = - \frac{1}{2}

2

n = 5

,

l = 3

,

m = 0

,

s = + \frac{1}{2}

3

n = 3

,

l = 2

,

m = - 2

,

s = - \frac{1}{2}

4

n = 3

,

l = 2

,

m = - 3

,

s = + \frac{1}{2}

Explanation:

(d) For a given value of ' $l$ 'the permissible values of ' $m$ ' are $- l, - (l - 1)$ $(l - 1), l$
Thus, for $l = 2, m$ cannot have a value of -3 .

Karnataka CET 2016

CHEMISTRY(KCET)

285233 The two electrons have the following sets of quantum numbers:

$P = 3, 2, - 2, + \frac{1}{2} : Q = 3, 0, 0, + \frac{1}{2}$
Which of the following statements is true?

1 P has greater energy thanQ .

2 P and Q represent same electron.

3

P

and

Q

have same energy.

4 P has lesser energy than Q.

Explanation:

(a) From the given quantum numbers, it can be inferred that:
P electron belongs to $3 d$ orbital.
Q electron belongs to $3 s$ orbital.
Hence, P has greater energy than Q .

Karnataka CET 2015

CHEMISTRY(KCET)

285234 Among the elements from atomic number 1 to36 , the number of elements which have an unpaired electron in their $s$ -subshell is

1 4

2 7

3 6

4 9

Explanation:

(c) $_{1} H = 1 s^{1};_{3} Li = 2 s^{1};_{11} Na = 3 s^{1}$ ;
$_{19} K = [Ar] 4 s^{1};_{24} Cr = [Ar] 3 d^{5} 4 s^{1}$
$_{29} Cu = [Ar] 3 d^{10} 4 s^{1}$

Karnataka CET 2014

CHEMISTRY(KCET)

285235 The statement that is not correct is

1 angular quantum number signifies the shape of the orbital

2 energies of stationary states in hydrogen like atoms is inversely proportional to the square of the principal quantum number

3 total number of nodes for 3 s orbital is three

4 the radius of the first orbit of

{He}^{+}

is half that of the first orbit of hydrogen atom.

Explanation:

(c) No. of nodes for any orbital
$= n - l - 1$
For 3 s -orbital, $n = 3$ and $l = 0$
Hence, no. of nodes for 3 s -orbital
$= 3 - 1 = 2$

Karnataka CET 2014

CHEMISTRY(KCET)

285232 Consider the following sets of quantum numbers:
Which of the below setting is not permissible arrangement of electrons in an atom?

1

n = 4

,

l = 0

,

m = 0

,

s = - \frac{1}{2}

2

n = 5

,

l = 3

,

m = 0

,

s = + \frac{1}{2}

3

n = 3

,

l = 2

,

m = - 2

,

s = - \frac{1}{2}

4

n = 3

,

l = 2

,

m = - 3

,

s = + \frac{1}{2}

Explanation:

(d) For a given value of ' $l$ 'the permissible values of ' $m$ ' are $- l, - (l - 1)$ $(l - 1), l$
Thus, for $l = 2, m$ cannot have a value of -3 .

Karnataka CET 2016

CHEMISTRY(KCET)

285233 The two electrons have the following sets of quantum numbers:

$P = 3, 2, - 2, + \frac{1}{2} : Q = 3, 0, 0, + \frac{1}{2}$
Which of the following statements is true?

1 P has greater energy thanQ .

2 P and Q represent same electron.

3

P

and

Q

have same energy.

4 P has lesser energy than Q.

Explanation:

(a) From the given quantum numbers, it can be inferred that:
P electron belongs to $3 d$ orbital.
Q electron belongs to $3 s$ orbital.
Hence, P has greater energy than Q .

Karnataka CET 2015

CHEMISTRY(KCET)

285234 Among the elements from atomic number 1 to36 , the number of elements which have an unpaired electron in their $s$ -subshell is

1 4

2 7

3 6

4 9

Explanation:

(c) $_{1} H = 1 s^{1};_{3} Li = 2 s^{1};_{11} Na = 3 s^{1}$ ;
$_{19} K = [Ar] 4 s^{1};_{24} Cr = [Ar] 3 d^{5} 4 s^{1}$
$_{29} Cu = [Ar] 3 d^{10} 4 s^{1}$

Karnataka CET 2014

CHEMISTRY(KCET)

285235 The statement that is not correct is

1 angular quantum number signifies the shape of the orbital

2 energies of stationary states in hydrogen like atoms is inversely proportional to the square of the principal quantum number

3 total number of nodes for 3 s orbital is three

4 the radius of the first orbit of

{He}^{+}

is half that of the first orbit of hydrogen atom.

Explanation:

(c) No. of nodes for any orbital
$= n - l - 1$
For 3 s -orbital, $n = 3$ and $l = 0$
Hence, no. of nodes for 3 s -orbital
$= 3 - 1 = 2$

Karnataka CET 2014

CHEMISTRY(KCET)

285232 Consider the following sets of quantum numbers:
Which of the below setting is not permissible arrangement of electrons in an atom?

1

n = 4

,

l = 0

,

m = 0

,

s = - \frac{1}{2}

2

n = 5

,

l = 3

,

m = 0

,

s = + \frac{1}{2}

3

n = 3

,

l = 2

,

m = - 2

,

s = - \frac{1}{2}

4

n = 3

,

l = 2

,

m = - 3

,

s = + \frac{1}{2}

Explanation:

(d) For a given value of ' $l$ 'the permissible values of ' $m$ ' are $- l, - (l - 1)$ $(l - 1), l$
Thus, for $l = 2, m$ cannot have a value of -3 .

Karnataka CET 2016

CHEMISTRY(KCET)

285233 The two electrons have the following sets of quantum numbers:

$P = 3, 2, - 2, + \frac{1}{2} : Q = 3, 0, 0, + \frac{1}{2}$
Which of the following statements is true?

1 P has greater energy thanQ .

2 P and Q represent same electron.

3

P

and

Q

have same energy.

4 P has lesser energy than Q.

Explanation:

(a) From the given quantum numbers, it can be inferred that:
P electron belongs to $3 d$ orbital.
Q electron belongs to $3 s$ orbital.
Hence, P has greater energy than Q .

Karnataka CET 2015

CHEMISTRY(KCET)

285234 Among the elements from atomic number 1 to36 , the number of elements which have an unpaired electron in their $s$ -subshell is

1 4

2 7

3 6

4 9

Explanation:

(c) $_{1} H = 1 s^{1};_{3} Li = 2 s^{1};_{11} Na = 3 s^{1}$ ;
$_{19} K = [Ar] 4 s^{1};_{24} Cr = [Ar] 3 d^{5} 4 s^{1}$
$_{29} Cu = [Ar] 3 d^{10} 4 s^{1}$

Karnataka CET 2014

CHEMISTRY(KCET)

285235 The statement that is not correct is

1 angular quantum number signifies the shape of the orbital

2 energies of stationary states in hydrogen like atoms is inversely proportional to the square of the principal quantum number

3 total number of nodes for 3 s orbital is three

4 the radius of the first orbit of

{He}^{+}

is half that of the first orbit of hydrogen atom.

Explanation:

(c) No. of nodes for any orbital
$= n - l - 1$
For 3 s -orbital, $n = 3$ and $l = 0$
Hence, no. of nodes for 3 s -orbital
$= 3 - 1 = 2$

Karnataka CET 2014

Question Bank Series

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation: