Substances that are oxidised and reduced in the following reaction are respectively

N₂H₄ (l) + 2H₂O₂ (l) $\to$N₂ (g) + 4H₂O (l)

• N₂H₄, H₂O

• N₂H₄, H₂O₂

• N₂, H₂O₂

• H₂O, N₂

During the decomposition of H₂O₂ to give oxygen, 48 g O₂ is formed per minute at a certain point of time. The rate of formation of water at this point is

• 0.75 mol min^-1

• 1.5 mol min^-1

• 2.25 mol min^-1

• 3.0 mol min^-1

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

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

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

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

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