AIIMS Chemistry Redox Reactions Class 11 Questions

Assertion: I₂O₅ is used to detect CO. Reason : In I₂O₅ the oxidation number of I is 5.

Which of the following can react with K₂Cr₂O₇

Which give colored carbonate precipitate?

The reaction of zinc with dilute and concentrated metric acid, respectively, produces:

Which element can have oxidation state from 4 to 6 ?

Which of the following complex is optically inactive

Which of the following is incorrect about $\text{K}_2\text{Cr}_2\text{O}_7$?

Choose the correct product of below reaction.

In order to oxidise a mixture of one mole of each of FeC₂O₄, Fe₂(C₂O₄)₃, FeSO₄ and Fe₂(SO₄)₃ in acidic medium, the number of moles of KMnO₄ required is:

Appropriate reducing agent for the following conversion is– $$\text{CH}_2=\text{CH}-\text{CH}_2-\text{C}(=\text{O})-\text{H} \longrightarrow \text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CH}_2\text{OH}$$

Which of the following can react with $\text{K}_2\text{Cr}_2\text{O}_7$

Blue colour disappears in which solution by passing $\text{SO}_2$

For the reaction, $$\text{Cr}_2\text{O}_7^{2-} \xrightarrow{\text{pH}=x} \text{CrO}_4^{2-} \xrightarrow{\text{pH}=y} \text{Cr}_2\text{O}_7^{2-}$$

The mass of potassium dichromate crystals required to oxidise 3 750 $cm^{3}$ of 0.6 M Mohr's salt solution is (Given, molar mass, potassium dichromate = 294, Mohr's salt = 392)

Best reagent for the conversion of AgNO₃ to Ag is

Chlorine oxidizes sodium thiosulphate to form

Substances that are oxidized and reduced in the following reaction are respectively. N₂H₄(l) + 2H₂O₂(l) → N₂(g) + 4H₂O(l)

Which of the following can be oxidized by SO₂?

In electrorefining of copper some gold is deposited at

Butyne-1 on oxidation with hot alkaline KMnO4 would give

K₂Cr₂O₇ in acidic medium converts into

MnO₃ in an acidic medium dissociates into

Predict the product of reaction of I₂ with H₂O₂ in basic medium.

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

Assertion : Sulphur is oxidised by H₂O₂ in presence of Fe (III). Reason : Fe (III) oxidises sulphur to sulphate.

Assertion : Chlorine undergoes disproportionation reaction in alkaline medium.

Assertion: The formal oxidation no. of sulphur in Na2S4O6 is 2.5.

Bromine is added to cold dilute aqueous solution of NaOH. The mixture is boiled. Which of the following statements is not true?

To a 25 ml H₂O₂ solution, excess of acidified solution of KI was added. The iodine liberated required 20 ml of 0.3 N Na₂S₂O₃ solution. The volume strength of H₂O₂ solution is

Which two of the following salts are used for preparing iodized salt? (i) KIO₃, (ii) KI, (iii) I₂, (iv) HI

In the balanced chemical reaction IO₃⁻ + aI⁻ + bH⁺ → cI₂ + dH₂O a, b, c and d respectively corresponds to

Assertion : Reaction of SO₂ and H₂S in the presence of Fe₂O₃ catalyst gives elemental sulphur. Reason : SO₂ is a reducing agent.

Assertion : Ozone is a powerful oxidising agent in comparison to O₂. Reason : Ozone is diamagnetic but O₂ is paramagnetic.

For decolourization of 1 mole of KMnO₄, the moles of H₂C₂O₄ required is

Assertion : HClO₄ is a stronger acid than HClO₃. Reason : Oxidation state of Cl in HClO₄ is +8 and in HClO₃, +5.

MnO₂ (± 1 mole) in neutral aqueous medium is disproportionated to

Assertion : PbI₄ is a stable compound. Reason : Iodide stabilizes higher oxidation state.

Oxidation state of Fe in Fe₃O₄ is

Assertion : Stannous chloride gives grey precipitate with mercuric chloride, but stannic chloride does not do so. Reason : Stannous chloride is a powerful oxidising agent which oxidises mercuric chloride to metallic mercury.

Assertion (A) : In some cases oxygen shows positive oxidation number though it is an electronegative element. Reason (R) : Fluorine is more electronegative than oxygen.

Oxidation state of sulphur in S₈, H₂S and SF₂ is

Assertion: Formic acid reduces mercuric chloride to mercurous chloride on heating, while acetic acid does not. Reason: Formic acid is stronger than acetic acid.