Hydrogen and Redox reactions

Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻ are respectively

When Cl₂ gas reacts with hot and concentration sodium hydroxide solution,the oxidation number of chlorine changes from

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated.During the reaction which element undergoes maximum change in the oxidation number

The oxidation states of Mn in MnSO₄,MnO₂,K₂MnO₄ and KMnO₄ are respectively

Oxidation numbers of carbon in CH₂Cl₂,CO₂ and CO₃²⁻ are respectively

Oxidation number of iron in [Fe(CN)₆]⁴⁻ is

K₃Fe(CN)₆ + e⁻ → K₄Fe(CN)₆ is known as

H₂S acts only as a reducing agent while SO₂, can act both as a reducing and oxidizing agent because

The oxidation state of chlorine in HClO₄ is

KMnO₄ acts as an oxidising agent in the netural medium and gets reduced to MnO₂. The equivalent weight of KMnO₄ in neutral medium will be

In Cr₂O₇²⁻ the oxidation numbers are

Among the following, identify the compound which cannot act as both oxidising and reducing agents

Which of the following can act as an oxidising as well as reducing agent

The reaction : Ag²⁺(aq) + Ag(s) ⇌ 2Ag⁺(aq) is an example of

The oxidation state of halogen atom is ‘+3’ in

Equivalent weight of KMnO₄ in basic medium is (mol.wt. of KMnO₄ = 158)

If HNO₃ changes into N₂O, the oxidation number is changed by

In the following change,KMnO₄ → MnO₂, the oxidation state of Mn changes as

The equivalent weight of phosphoric acid (H₃PO₄) in the reaction
NaOH + H₃PO₄ → NaH₂PO₄ + H₂O is

In acidic medium, the equivalent weight of KMnO₄ is

A 2.5 mol sample of N₂H₄ loses 25 mol of electrons in being converted to a new compound X, Assuming that all of the nitrogen appears in the new compound, what is the oxidation state of nitrogen in the compound

In which of the following compounds manganese has oxidation number equal to that of iodine in KIO₄

The oxidation number of sulphur is -1 in

Which of the following is a disproportionation reaction

Of the following reaction, only one is a redox reaction.Identify this reaction

Volume of 0.1 M K₂Cr₂O₇ required to oxidize 35 mL of 0.5 M FeSO₄ solution is

Which of the following is the strongest oxidising agent

The strongest reducing agent among the following is

The oxidation number of xenon in XeOF₂ is

During a redox titration involving a solution containing Fe²⁺ ions against MnO₄⁻ in the presence of excess of H⁺ ions, the number of electrons that get transferred is

In which of the following compounds, carbon exhibits a valency of 4 but oxidation state -2

H₂O₂ reduces MnO₄⁻ ion to

In the conversion of Br₂ to BrO₃⁻, the oxidation number of Br changes from

What is the equivalent mass of IO₄⁻ when it is converted into I₂ in acid medium

Which of the following is redox reaction

The number of electrons involved in the reduction of one nitrate ion to hydrazine is

An example of redox reaction

Oxidation state of Fe in Mohr’s salt is

The oxidation states of S atoms in S₄O₆²⁻ from left to right respectively

The oxidation state of S in H₂SO₄ is

If KMnO₄ is reduced by oxalic caid, in an acidic medium, then oxidation number of Mn changes from

The oxidation number of nitrogen in (N₂H₅)⁺ is

The oxyacid of phosphorus, in which phosphorus has the lowest oxidation state, is

Oxidation number of Fe in Fe₃O₄ is

Oxidation state of oxygen atom in potassium peroxide is

The oxidation state of Fe in brown ring complex [Fe(H₂O)₅NO]SO₄ is

In the following reaction reducing agent is
2K₃[Fe(CN)₆] + H₂O₂ + 2KOH → 2K₄[Fe(CN)₆] + 2H₂O + O₂

The oxidation number of nitrogen in HNO₃ is

The oxidation number of P in Mg₂P₂O₇ is

Which conversion is an oxidation

What is the oxidation state of P in Ba(H₂PO₂)₂

Which of the following acts as an oxidising as well as reducing agent

Which is the redox reaction

The oxidation number of As in H₂AsO₄⁻ is

Which of the following acts as both reducing and oxidising agent

The equilibrium weight of MnSO₄ is M/2 when it changes into

M⁺³ ion loses 3e⁻. Its oxidation number will be

Numbers of moles of K₂Cr₂O₇ reduced by one mole os Sn²⁺

H₂S is not a

oxidation state of oxygen in F₂O is

when a manganous salt is fused with a mixture of KNO₃ and solid NaOH the oxidation number of Mn changes from +2

Pure nascent hydrogen is based obtained by

Hydrogen cannot be obtained by

Last molecule of H₂O is evolved from H₂O₂ by

Which of the following statement regarding hydrogen peroxide is false

Which of the following is heavy water

Which of the following statement is correct

The boiling point of heavy water is

Para and ortho-hydrogen differ in

Heavy water is obtained by

Bond angle in H₂O₂ is

What is the value of carbonate hardness of water sample if 100 mL of it took 5 mL of 0.09 N HCl solution ? (Molecular weight of Na₂CO₃ = 106)

The maximum number of hydrogen bonds formed by a water molecule in ice is

Hydrogen burns in air with a

Triple point of water is

By which of the following processes permanent hardness of water can be removed

Hydrogen can be fused to form helium at

Which of the following can produce hydrogen from water

H₂ will not reduce which of following oxide?

Deuterium nucleus contains

Which of the following metals reacts with water

The volume of 3.0 N-H₂O₂ strength is

Which of the following reaction produces hydrogen

The reagent commonly used to determine hardness of water titrimetrically is

The mixture of concentrated HCl and HNO₃ made in 3:1 ratio contains

In solid ice, oxygen atom is surrounded

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

Which of the following pairs of substance on reaction will not evolve H₂ gas

A 6 volume sample of H₂O₂

What is the approximate percentage of H₂O₂ in a sample labelled as 10 V?

The percentage strength (in g litre⁻¹) of 10 mL of 20 vol.solution of H₂O₂ is

Which of the following statement about water is wrong?

A deutrium is

In the softening of the water by passing it through cationic and anionic exchange resins, when water is passed only through the cation exchanger

In the reaction of H₂O₂ with acidified KMnO₄

In which of the following reaction, the hydrogen peroxide is a reducing agent?

Position of hydrogen in periodic table is such that it can be placed in

Hardness of water due to presence of salts of

5 g of hydrogen peroxide is present in 56 mL of solution. The solution will correspond to

Calculate the amount of [Ca(OH)₂] required to remove the hardness of water from 60,000 litres containing 16.2 g of Ca(HCO₃)₂ per 100 litre

If a given sample of water contains 0.06 g of Ca²⁺ ion per kg, calculate the ppm level of Ca²⁺ ions

Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda.When CO₂ is bubbled through A, it turns cloudy. what is A?

If 2 g of aluminium is treated, first with excess of dilute H₂SO₄ and then with excess of NaOH, the ratio of the volumes of hydrogen evolved is

If 10 cm³ solution of H₂O₂ ,on decomposition gives 150 cm³ of O₂ at STP, then volume strength of H₂O₂ is

Ammonia gas dissolves in water to form NH₄OH.In this reaction water acts as

Water is a

What is the volume of ’20 volume H₂O₂. required to get 5000 cm³ of oxygen at STP?

Alum is a water purifier because it

The reaction in which hydrogen peroxide acts as a reducing agent is

Action of water or dilute mineral acids on metals can give

Water softening by Clark’s process uses

The normality of 10 volume hydrogen peroxide is

The H – O – O bond angle in H₂O₂ is

The bond angle in water is

The hybridization of oxygen atom in H₂O₂ is

Which one of the following statements is incorrect with regard to ortho and para-dihydrogen

Zeolite used to soften hardness of water is, hydrated

Which among the following is kinetically inert towards water?

Permanent hardness of water is due to the presence of

Syngas is a mixture of

The strength of H₂O₂ (in g/litre) in 11.2 volume solution of H₂O₂ is

Which one of the following statements is not correct for ortho and para hydrogen?

Which of the following is not correct for D₂O

When sodium is added to ethanol

The temperature, at which heavy water has maximum density is

Water is oxidised to oxygen by

The volume occupies by one molecules of water is [density of water =1g/cm³

Oxygen is not evolved on reaction of ozone with

In aqueous solution of H₂O₂ oxidises H₂S

In H₂O₂ molecules, the angle between two O-H planes is

Ionic hydrides reacts with water to give

H₂O₂ is manufactured these days by

Which of the following will not displace hydrogen

Heavy water is

ortho and para hydrogen differ in the

Tritium is the isotope of

Water has high boiling point because

On reaction with Mg, very dilute nitric acid produces

Electronic configuration of hydride ion is

Ortho and para-hydrogen have