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

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)

Given the following data:

In light of the data given above, the uncertainty involved in the measurement of velocity within a distance of 0.1 $\stackrel{°}{\mathrm{A}}$ will be:
1. 5.79 x 10⁶ ms^-1       
2. 5.79 x 10⁷ ms^-1
3. 5.79 x 10⁸ ms^-1         
4. 5.79 x 10⁵ ms^-1

The orientation of an atomic orbital is governed by:

1. Azimuthal quantum number

2. Spin quantum number

3. Magnetic quantum number

4. Principal quantum number

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

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

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

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

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⁺