Which one of the following ions has electronic configuration [Ar]3d6?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

1. Ni3+               

2. Mn3+

3. Fe3+               

4. Co3+

Subtopic:  AUFBAU Principle |
 78%
From NCERT
NEET - 2010
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Which one of the elements with the following outer orbital configurations may exhibit the

largest number of oxidation states ?

1. 3d3, 4s2

2. 3d5, 4s1

3. 3d5, 4s2

4. 3d2, 4s2

Subtopic:  AUFBAU Principle |
 63%
NEET - 2009
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Maximum number of electrons in a subshell of an atom can be determined by which of the following formula :

1. 4l + 2

2. 2l + 1

3. 4l - 2

4. 2n2

Subtopic:  Shell & Subshell |
 64%
From NCERT
NEET - 2009
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The energy absorbed by each molecule(A2) of a substance is 4.4×10-19J and bond energy per molecule is 4.0×10-19J the  energy of the molecule per atom will be:
1. 2.2×10-19J
2. 2.0×10-19J
3. 2.0×10-20J
4. 4.0×10-20J
 
Subtopic:  Planck's Theory |
NEET - 2009
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Which of the following is not permissible arrangement of electrons in an atom ?

1. n=4, l=0, m=0, s=-1/2

2. n=5, l=3, m=0, s=+1/2

3. n=3, l=2,m=-3, s=-1/2

4. n=3, l=2, m=-2, s=-1/2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 88%
From NCERT
NEET - 2009
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If uncertainty in position and momentum are both equal, then uncertainty in velocity is: 

1. 12mhπ

2. h2π

3. 1mhπ

4. hπ

Subtopic:  Heisenberg Uncertainty Principle |
 76%
From NCERT
NEET - 2008
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The measurement of the electron position is associated with an uncertainty in momentum which is equal to 1x10-18 g cm s-1. The uncertainty in velocity of the electron will be:

(mass of an electron is 9 x 10-28 g)

1. 1 x 109 cm s-1                     

2. 1 x 106 cm s-1

3. 1 x 105 cm s-1                     

4. 1 x 1011 cm s-1

Subtopic:  Heisenberg Uncertainty Principle |
 63%
From NCERT
NEET - 2008
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Consider the following sets of quantum numbers:

              n         l         m         s

(i)         3         0         0          +1/2

(ii)        2         2         1          +1/2

(iii)       4         3        -2           -1/2

(iv)       1         0        -1           -1/2

(v)        3         2         3           +1/2

Which of the following sets of quantum numbers is not possible?

1. ii, iii and iv                             

2. i, ii, iii and iv

3. ii, iv and v                               

4. i and iii

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 84%
From NCERT
NEET - 2007
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Which one of the following ions is the most stable in aqueous solution?

(1) Cr3+                         

(2) V3+

(3) Ti3+                         

(4) Mn3+

(At no. Ti=22, V=23, Cr=24, Mn=25)

Subtopic:  AUFBAU Principle |
NEET - 2007
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Given: The mass of electron is 9.11 x 10-31 kg

Planck constant is 6.626 x 10-34 Js

the uncertainty involved in the measurement of velocity within a distance of 0.1 A° is:

(a) 5.79 x 106 ms-1                      (b) 5.79 x 107 ms-1

(c) 5.79 x 108 ms-1                      (d) 5.79 x 105 ms-1

Subtopic:  Heisenberg Uncertainty Principle |
 56%
From NCERT
NEET - 2006
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