Common Oxidation States

Q. The pair of compounds in which both the metals are in the highest possible oxidation state is (1) FeSO, CuS2 (2) CrO2Cl2, MnO4 (3) TIO2, MnO2 (4) [Co(CN)g MnO 2- 4

Q. The oxidation number Ba in barium peroxide is

1. 6
2. 2
3. 1
4. 4

Q.

The process in which the strength of an unknown solution is calculated using a known standard solution is known as

1. titration

2. oxidation

3. reduction

4. none of these

Q. Assign oxidation number to the underlined element in $Na{H}_2\underset{–}{P}{O}_4$.

Q.

Oxygen exhibits +2 oxidation state in the compound:

1. MgO

2. H₂O

3. OF₂

4. Na₂O

Q.

The oxidation number of oxygen in superoxides is

1. -1

2. -2

3. 1

4. -1/2

Q.

Which of the following statement is wrong for the transition elements?

1. Last electron enters in orbital

2. Exhibits variable valency

3. General electronic configuration is

4. Transition elements are placed from and period

Q. 25.Oxidation number of chromium atom in CrO5 and K3CrO8 respectively is

Q. 8. What is the oxidation state of each element in sodium nitroprusside and sodium thionitroprusside

Q. 38. In which of the following compounds nitrogen exhibits highest oxidation state? 1) N3H 2) NH2OH 3) N2H4 4) NH3

Q. Assign oxidation number to the underlined element in $K_2\underset{–}{Mn}{O}_4$

Q. 12.Among the following outermost configuration of metals , which shows the highest oxidation state 1) 3d3 4s2 2) 3d5 4s1 33d5 4s2 4)3d6 4s2

Q. 42. How to find oxidation state of central atom maximum oxidation state. A.Cl2O7 B.Cl2O7 C.HClO2 D.ClO2

Q. 2.The oxidation number of oxygen in H_2O_2 and O_2 respectively are A)–1, 2 B)–2, 2 C)0, –2 D)–1, 0 ​

Q. 41. In Wacker oxidation of ethene, product formed is??

Q. oxidation number of A , B , C are +2 +5 -2 resp .possible formula of the compound is?

Q. 19. Why does the Mn (magnise) shows two different oxidation number?

Q.

In the conservation $B{r}_2⟶BR{O}_3^{-}$, the oxidation state of bromine changes from

1. - 1 to - 1

2. 0 to - 1

3. 0 to + 5

4. 0 to - 5

Q. The product of oxidation of $I^{-}$ with $Mn{O}_4^{-}$ in alkaline medium is:

1. $I{O}_3^{-}$
2. $I_2$
3. $I{O}^{-}$
4. $I{O}_4^{-}$

Q. Assertion: The formal oxidation number of sulphur in Na2S4O6 is 2.5 Reason: Two S-atoms are not directly linked with O-atomsselect: Assertion: The formal oxidation number of sulphur in Na2S4O6 is 2.5 Reason: Two S-atoms are not directly linked with O-atoms

Q.

What is the oxidation number of hydrogen, oxygen sulphur in the equation H2SO4? How to make out which element posses which oxidation number? Is oxidation number equals its valency? Then why not oxidation number of sulphur -2?

Q. 33. Oxidation state of each element in sodium thionitroprusside

Q. 66 Why cant the oxidation state of group 15 elements exceed upto +8 ?

Q. 67. How many have two different oxidation number same element 1) Cr O5 5) Na2 S4 O6 2) K3 Cr O8 6) Br3 O8 3) H3 PO5 7) H2 [Cu H4] 4) H2 N2 O2 8) NH4 NO2

Q. what are the peroxides and wh y the oxidation state of oxygen is -2?

Q. 34. Are the oxidation state and covalency of Al in [AlCl(H2O)5]2+same?What will be the oxidation state and covalency?How?

Q. If we calculate the oxidation state of oxygen in Na2O2, why is it + 1 ?

Q. Assign oxidation number to the underlined element in $NaH\underset{–}{S}{O}_4$.

Q. In acidic medium, $H_2{O}_2$ changes $C{r}_2{O}_7^{2-}$ to $Cr{O}_5$ which has two ( - O - O -) bonds. Oxidation state of Cr in $Cr{O}_5$ is

1. 5
2. 3
3. 6
4. -10

Q. if oxidation state of A is +2 of B is +3 And of c its _2 then whatis possible formula for compound 1\}A3(B2C)2 2\}A2(BC)2 3\} B3(AC3)2 4\} A3(BC3)