Q. No.Match Column-I with Column-II and mark the most appropriate option:
Column-I
(Metal ion)
Column-II
(Spin magnetic moment)
A.
Co3+
i.
√8 B.M.
B.
Cr3+
ii.
√35 B.M.
C.
Fe3+
iii.
√15 B.M.
D.
Ni2+
iv.
√24 B.M.
A
B
C
D
1.
iv
iii
ii
i
2.
i
ii
iii
iv
3.
iv
i
ii
iii
4.
iii
iv
i
ii
(Metal ion)
(Spin magnetic moment)
When copper is heated with conc. HNO3 it produces:
1. Cu(NO3) and NO
2. Cu(NO3)2, NO and NO2
3. Cu(NO3)2 and N2O
4. Cu(NO3)2 and NO2
| 1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
|
| 3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
| 1. | \(\text{ [Xe] } 4f^8 6 d^2\) | 2. | \(\text { [Xe]}4 f^9 5 s^1\) |
| 3. | \(\text { [Xe] } 4f^7 5 d^1 6 s^2\) | 4. | \(\text { [Xe]} 4f^6 5 d^2 6 s^2\) |
A pair among the following have nearly the same atomic radii:
(Numbers in the parenthesis are atomic numbers).
| 1. | Ti (22) and Zr (40) | 2. | Zr (40) and Nb (41) |
| 3. | Zr (40) and Hf (72) | 4. | Zr (40) and Ta (73) |
Which of the following processes does not involve the oxidation of iron?
| 1. | Rusting of iron sheets |
| 2. | Decolourisation of blue CuSO4 solution by iron |
| 3. | Formation of Fe(CO)5 from Fe |
| 4. | Liberation of H2 from steam by iron at high temperature |
The number of d -electrons in Fe2+ (atomic number Z = 26) is different from the number of:
1. s-electrons in Mg (Z = 12)
2. p-electrons in Cl (Z = 17)
3. d-electrons in Fe (Z = 26)
4. p-electrons in Ne (Z = 10)
The pair of compounds that can exist together is:
1. FeCl3, SnCl2
2. HgCl2, SnCl2
3. FeCl2, SnCl2
4. FeCl3, Kl
In acidic medium, H2O2 changes Cr2O7–2 to CrO5 which has two (–O – O–) bonds.
The oxidation state of Cr in CrO5 is:
1. +5
2. +3
3. +6
4. -10
2. Na2S > CuS > ZnS
3. Na2S > ZnS > Cus
4. Cus > ZnS > Na2S
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