Which of the following is not a redox reaction ?

• KCN + Fe(CN)₂ $\to$K₄[Fe(CN)₆]

• Rb + H₂O $\to$ RbOH + H₂

• H₂O₂ $\to$ H₂O + O

• CuI₂ $\to$ CuI + I₂

Consider the reaction ,

Fe²⁺ $\rightleftharpoons$ Fe³⁺ + e^-

• the reaction towards the left is a reduction

• the reduction towards the right is a reduction

• the reaction towards the right is an oxidation

• the reaction towards the right is an oxidation and the reaction towards the left is an reduction

Oxidation state of iron in haemoglobin is

• 0

• +2

• -2

• +3

Which of the following statement is not true for hydrolysis of XeF₆?

• XeOF₄ is formed.

• XeO₂F₂ is formed.

• It is a redox reaction.

• XeO₃ is formed

When SO₂ gas is passed through an acidified K₂Cr₂O₇ solution :

• the solution becomes blue

• SO₂ gets reduced

• Cr(SO₄)₃ is formed

• the solution becomes colourless

In the following reaction ,

P₄ + 3NaOH + 3H₂O $\to$ PH₃ + 3NaH₂PO₂

• phosphorus is oxidised

• phosphorus is oxidised and reduced

• phosphorus is reduced

• sodium is oxidised

Which of the following ion does not exist?

• [CuI₄]^2-

• VO${}_4^{3-}$

• WO${}_4^{2-}$

• CrO${}_4^{2-}$

MnO₃ in an acidic medium dissociates into

• ${\mathrm{MnO}}_2 \mathrm{and} {\mathrm{MnO}}_4^{-}$

• $\mathrm{MnO} \mathrm{and} {\mathrm{MnO}}_4^{-}$

• ${\mathrm{MnO}}_2 \mathrm{and} \mathrm{MnO}$

• ${\mathrm{MnO}}_2 \mathrm{and} {\mathrm{MnO}}_3$

Assertion : Cu is stronger reducing agent than H₂.

Reason : E° of Cu²⁺/Cu is negative.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

When KMnO₄ reacts with KBr in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to

• +6

• +4

• +3

• +2