Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

The oxidation states of Mn in K_(2)MnO_(4), KMnO_(4) and Mn_(2)O_(7) are respectively :

Answer»

`+6 + 7 + 8`
` + 4+6, + 8`
` + 6 + 7 + 7`
` + 7 + 6 + 7`

ANSWER :C
Discussion
2.

The oxidation states of phosphorus vary from:

Answer»

-1 to +3
-3 to +3
-3 to +5
-5 to +1

Answer :C
Discussion
3.

The oxidation states of P in H_4 P_2 O_5, H_4 P_2 O_6 and H_2 P_2 O_7 are respectively

Answer»

`+3`,+4,+5
`+3`,+5,+4
`+5`,+3,+4
`+5`,+4,+3

Solution :`H_(4)P_(2)O_(5) (+3) , H_(4)P_(2)O_(6) (+4), H_(4)P_(2)O_(7)(+5)`
Discussion
4.

The oxidation states of Cr in [Cr(H_(2)O)_(6)]Cl_(3), [Cr(C_(6)H_(6))_(2)] and K_(2)[Cr(CN)_(2)(O_(2))(O_(2))(NH_(3))] respectively are -

Answer»

`+3, +4 and +6`
`+3, +2 and +4`
`+3, 0 and +6`
`+3, 0 and +4`

Solution :`[CR(H_(2)O)_(6)]Cl_(3) rArr x+6xx0+3xx(-1)=0`
`rArr x=+3`
`[Cr(C_(6)H_(6))_(2)] rArr x+2xx0 rArr x=0`
`K_(2)[Cr(CN)_(2)(O)_(2)(O_(2))(NH_(3))]rArr+2xx(+1)+x+2(-1)+2xx(-2)+1xx(-2)+1xx0=0`
`rArr x=+6`
Discussion
5.

The oxidation state(s) of copper is (are)

Answer»

`+1`
`+2`
`+3`
`-1`

Solution :Cu SHOWS only +1,+2, OXIDATION STATES
Discussion
6.

The oxidation state shown by silicon when it combines with strongly electropositive metals is

Answer»

`-2`
`-4`
`+4`
`-2`

Solution :SILICON forms silicides with strongly ELECTROPOSITIVE metals (like NA, Mg, K ETC.) In these compounds. It has oxidation number `=-4`.
Discussion
7.

The oxidation state of Xe inXeF_4 is:

Answer»

+2
+4
Zero
+5

Answer :B
Discussion
8.

The oxidation state of Xe in XeO_(3) and the bond angle in it respectively, are

Answer»

`+6 , 109^@C`
`+8, 103^@`
`+6, 103^@`
`+8, 120^@`

Answer :C
Discussion
9.

The oxidation state of Xe inXeF_2 is:

Answer»

+2
+4
Zero
+3

Answer :A
Discussion
10.

The oxidation state of the noble gas element in xenon oxydifluoride [XeOF_2] is

Answer»

0
`+1`
`+4`
`+8`

ANSWER :C
Discussion
11.

The oxidation state of the most electronegative element in the product of the reaction between BaO_2 and H_2 SO_4 are

Answer»

`-1 and 0`
`-1 and -2`
`-2 and -1`
`0 and -1`

ANSWER :B
Discussion
12.

The oxidation state of the metal forming the complex K_2[PtCl_6] is

Answer»

`+1`
`+2`
`+3`
`+4`

ANSWER :D
Discussion
13.

The oxidaton sttae of sulphur in the anions follow the order

Answer»

`S_2O_4^(2-)ltSO_3^(2-)ltS_2O_6^(2-)`
`S_2O_4^(2-)ltS_2O_3^(2-)ltS_2O_6^(2-)`
`S_2O_4^(2-)ltS_2O_6^(2-)ltSO_3^(2-)`
`S_2O_6^(2-)ltS_2O_4^(2-)ltSO_3^(2-)`

ANSWER :A
Discussion
14.

The oxidation state of sulphur in peroxy disulphuric acid is

Answer»

`+2`
`+3`
`+4`
`+6`

ANSWER :D
Discussion
15.

The oxidation state ofS in [S_(2)(O_(2))O_(6)]^(2-)is

Answer»

`+2`
`+4`
`+6`
`+7`

Solution :`S_(2)O_(8)^(2-)`has structure
`.^(-)Ounderset(O)underset(||)overset(O)overset(||)(S)-O-Ounderset(O)underset(||)overset(O)overset(||)(S)-O^(-)`
2O ATOMS have peroxide LINKAGE so it may be written as `S_(2)(O_(2))O_(6)^(2-)`
`therefore2x-2+6(-2)=-2 "" thereforex=+6`
Discussion
16.

The oxidation state of S inNa_2S_4O_6 is:

Answer»

`+2`
`+4`
`+6`
`+2.5`

ANSWER :D
Discussion
17.

The oxidation state of S in Caro's acid (permono sulphuric acid) H_(2)SO_(5) is

Answer»

`+8`
`+6`
`+5`
`+4`

Solution :`H_(2)SO_(5)` has one peroxide bond as

So , it MAY be written as
`H_(2)S(O_(2))O_(3)`
`+2+x-2+3(-2)=0"" thereforex=+6`
Discussion
18.

The oxidation state of Pt in [Pt(C_(2)H_(4))Cl_(3)]^(-) is

Answer»

`+1`
`+2`
`+3`
`+4`.

ANSWER :B
Discussion
19.

Theoxidationstateof phosphorusin phosphonic acid is

Answer»

<P>`+5`
`+1`
`+3`
`+4`

Solution :Phosphonic Acid (Hypophosphorous acid) : `H_(3)PO_(2)`
`3HI + P + 2O` = ZERO
`therefore 3(+1) + X + 2(-2)=0`
`therefore +3 + x-4=0`
`therefore x-1=0, therefore x=+1`
Discussion
20.

The oxidation state of phosphorus in cyclotrimentaphosphoric acid is

Answer»

`+3`
`+5`
`-3`
`+2`

Solution :O.S. of P in `(HPO_(3))_(2)` is `(+1 + X - 6)_(3) = 0` or x = + 5
Discussion
21.

The oxidation state of phoshorus varies form :

Answer»

`-1` to `+1`
`-3` to `+3`
`-3` to`+5`
`-5` to`+1`

ANSWER :C
Discussion
22.

The oxidation state of phosphorous in various compounds vary between

Answer»

(-3) to +5
(-1) to +3
(-3) to +3
(-5) to +5

Answer :A
Discussion
23.

The oxidation state of oxygen is zero in

Answer»

CO
`O_(3)`
`SO_(2)`
`H_(2)O_(2)`

ANSWER :B
Discussion
24.

What is the oxidation state of oxygen in peroxide i.e.H2O2?

Answer»

`-1`
`+2`
`-2`
`+1`.

ANSWER :A
Discussion
25.

The oxidationstateof osmium (Os)in OsO_4 is

Answer»

`+7`
`+6`
`+4`
`+8`

SOLUTION :`O.N` ofOsin ` OsO_4 `
` x- 4 XX 2 =0or= +8`
Discussion
26.

The oxidation state of nitrogen is highest in

Answer»

`N_(3)H`
`NH_(2)OH`
`N_(2)H_(2)`
`NH_(3)`

Solution :`3XX x+1 (1)=0`
`3x+1=0`
`3x=-1, IMPLIES x= -1/3` in `N_(2)H`
`x+2(+1)+1(-2)+1(1)=0`
`x=-1` in `NH_(2)OH`
`x xx 2+4(1)=0""x=-4/2=-2` in `N_(2)H_(4)`
`x+3(1)=0""x=-3` in `NH_(3)`
Hence, highest in `N_(3)H`.
Discussion
27.

The oxidation state of nitrogen varies form :

Answer»

`-3 to +5`
`0 to + 5`
` -3 to 1`
`+3 to +5`

ANSWER :D
Discussion
28.

The oxidation state of nitrogen in peroxynitric acid is :

Answer»

`+3`
`+2`
`+7`
`+5.`

ANSWER :C
Discussion
29.

The oxidation state of nitrogen in NH_4NO_3 is:

Answer»

`-3` and `+5`
`+3` and `+5`
`+5`
`+3`

ANSWER :A
Discussion
30.

The oxidation state of nitrogen in hydrazine is

Answer»

`-1`
`-2`
`+1`
`+2`

ANSWER :B
Discussion
31.

The oxidation state of "Ni" in Ni(CO)_(4) is

Answer»

`+II`
ZERO
`+III`
`+VIII`

Answer :B
Discussion
32.

The oxidation state of nickel in [Ni(CO)_(4)] is

Answer»

4
0
2
3

Answer :B
Discussion
33.

The oxidation state of nickel in K_(4)[Ni(CN)_(4)] is:

Answer»

`+4`
0
`+2`
`-2`

ANSWER :B
Discussion
34.

The oxidation state of Ni in Ni(Co)_4 is:

Answer»

ZERO
`+4`
`+8`
`+2`

ANSWER :A
Discussion
35.

The oxidation state of nickle in[Ni(CO) _4] is ____________

Answer»

`+II`
ZERO
`+III`
`+VIII`

ANSWER :B
Discussion
36.

The oxidation state of Ni in [Ni(CN)_4]^(2-) ion is:

Answer»

`-2`
`+2`
`+4`
0

Answer :B
Discussion
37.

The oxidation state of Ni in nickel carbonyl is:

Answer»

Zero
1
2
3

Answer :A
Discussion
38.

The oxidation state of N in NH_(3) is

Answer»

`+3`
`-3`
`-1//3`
`+1//3`

ANSWER :C
Discussion
39.

The oxidation state of mo in its oxido-complex - complex species [Mo_(2)O_(4)[C_(2)H_(4))_(2)(H_(2)O)]^(2-) is

Answer»

`+2 `
`+3`
`+4`
`+5`

ANSWER :B
Discussion
40.

The oxidation state of Mo in its oxido-complex species [Mo_(2)O_(4)(C_(2)H_(4))_(2)(H_(2)O)_(2)]^(2-) is :

Answer»

`+2`
`+3`
`+4`
`+5`

SOLUTION :
Discussion
41.

The oxidation state of Mo in its oxo-complex species [Mo_2O_4(C_2H_4)_2(H_2O)_2]^(2-)is:

Answer»

`+2`
`+3`
`+4`
`+5`

Answer :B
Discussion
42.

The oxidation state of Mo in its oxido-complex species [Mo_(2)O_(4)(C_(2)H_(4))(H_(2)O)_(2)]^(2-) is

Answer»

`+2`
`+3`
`+4`
`+5`

ANSWER :B
Discussion
43.

The oxidation state of Mn in MnO_4^(2-) is

Answer»

`+8`
`+6`
`+7`
`+5`

Answer :B
Discussion
44.

The oxidation state of metal in inetal carbonyl is

Answer»

0
1
2
3

Answer :A
Discussion
45.

The oxidation state of metal in metal carbonyl is :

Answer»

Zero
1
2
3

Answer :A
Discussion
46.

The oxidation state of M^(3+) after removing three elelctrons is

Answer»

ZERO
`+3`
`+6`
`-6`

SOLUTION :After REMOVING three electrons from `M^(3+)` the OXIDATION state is `M^(6+)`.
Discussion
47.

The oxidation state of Lu in 4f ^(14) configuration is

Answer»

`+2`
`+3`
`+4`
`+6`

Answer :B
Discussion
48.

The oxidation state of iron in sodium nitroprusside is :

Answer»

`+2`
`+1`
ZERO
`+3`

ANSWER :A
Discussion
49.

The oxidation state of iron inK_(4)[Fe(CN)_(6)] is

Answer»

1
4
3
2

Solution :OXIDATION state of Fe in `K_(4)[Fe(CN)_(6)]`,
`+4 + X + 6(-1) = 0`
or, `x-2 = 0 Rightarrow x = +2`
Discussion
50.

The oxidation state of iron in Na_(4)[Fe(CN)_(5)(NOS) is:

Answer»

`+1`
`+2`
`+3`
zero

Answer :B
Discussion