Oxidising Reagent and Reducing Reagent

Q.

Explain the term disproportionation reaction.

Q. What is the oxidation of Ni (Ni(CO)4)

Q.

Identify the reducing agent in the following reactions: ${\mathrm{H}}_2\mathrm{O}+{\mathrm{F}}_2\to \mathrm{HF}+\mathrm{HOF}$

Q.

Check whether the reaction $H_{2}S+S{O}_2\to H_{2}O+S$ is a redox reaction or not? If yes, what will be the oxidant?

1. Yes, ${\mathrm{SO}}_2$

2. Yes, $\mathrm{S}$

3. Yes, ${\mathrm{H}}_2\mathrm{S}$

4. No, this is not redox

Q.

Which of the following hydride is not a reducing agent?

1. ${\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{H}}_2\mathrm{S}$

3. ${\mathrm{H}}_2\mathrm{Te}$

4. ${\mathrm{H}}_2\mathrm{Se}$

Q.

Oxidation is defined as:

1. loss of electron

2. gain of electron

3. loss of proton

4. gain of proton

Q.

The compound $Ag{F}_2$ is an unstable compound. However, if formed, the compound acts as a very strong oxidizing agent. Why?

Q.

Give Reasons: ${\mathrm{Cr}}^{2+}$ is a strong reducing agent whereas ${\mathrm{Mn}}^{2+}$ is not. $[\mathrm{Cr}=24,\mathrm{Mn}=25]$

Q. Assertion: Aryl iodides can be prepared by reaction of arenes with iodine in the presence of an oxidising agent.

Reason: Oxidising agent oxidises $I_2\text{into}HI$

1. Assertion and reason both are correct statements but reason is not correct explanation of assertion.

2. Assertion and reason both are wrong statements.
3. Assertion and reason both are correct and reason is the correct explanation of assertion.
4. Assertion is correct but reason is wrong statement
5. Assertion is wrong but reason is correct statement.

Q. Assertion: Electrolysis of NaCl solution gives chlorine at anode instead of $O_2$.Reason: Formation of oxygen at anode requires overvoltage.

1. Assertion is false but the reason is true.
2. Both assertion & reason are fals
3. Both assertion and reason are true but reason is not the correct explanation of assertion
4. Assertion is true but the reason is false
5. Both assertion and reason are true and reason is the correct explanation of assertion.

Q.

The decomposition of ${\mathrm{KCIO}}_3$, to $\mathrm{KCI}$ and ${\mathrm{O}}_2$ on heating is an example of

1. Intermolecular redox change

2. Intramolecular redox change

3. Disproportionation or auto redox change

4. None of the above

Q. Amount of oxalic acid present in a solution can be determined by its titration with $KMn{O}_4$ solution in the presence of $H_{2}S{O}_4$ The titration gives unsatisfactory result when carried out in the presence of $HCl$, because $HCl$

1. Gets oxidised by oxalic acid to chlorine
2. Oxidises oxalic acid to carbon dioxide and water
3. Reduces permanaganate to $M{n}^{2+}$
4. Furnishes $H^{+}$ ions in addition to those from oxalic acid

Q.

Separate out exothermic and endothermic process from the following:

When iron fillings are added to a solution of copper sulphate, heat is liberated.

Q.

Predict condition under which Al might be expected to reduce MgO.

Q. The oxidation of ketones involves carbon−carbon bond cleavage. Name the products formed on the oxidation of $2,5-$dimethylhexan$-3-$one.

Q.

While sulphur dioxide and hydrogen peroxide can act as oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why?

Q. From the following statements regarding $H_2{O}_2$ choose the incorrect statement.

1. It can act only as an oxidixing agent
2. It decomposed on exposure to light
3. It has to be stored in plastic or wax lined glass bottles in dark
4. It has to be kept away from dust

Q.

How are the following indicated in a chemical equation?

Evolution or absorption of heat.

Q.

Write the reaction of thermal decomposition of sodium azide.

Q. Does the hydrolysis of $Xe{F}_6$ lead to a redox reaction?

Q. Consider a first order gas phase decomposition reaction given below : $A\left(g\right)\to B\left(g\right)+C\left(g\right)$ The initial pressure of the system before decomposition of A was pi. After lapse of time ‘t’, total pressure of the system increased by x units and became ‘pt’. The rate constant k for the reaction is given as _________.

1. $k=\frac{2.303}{t}log\frac{pi}{pi-x}$
2. $k=\frac{2.303}{t}log\frac{pi}{2pi+pt}$
3. $k=\frac{2.303}{t}log\frac{pi}{pi+x}$
4. $k=\frac{2.303}{t}log\frac{pi}{2pi-pt}$

Q.

The Oxidising Agent for the following reaction is ________.

${\mathrm{CH}}_4\left(\mathrm{g}\right)+2{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

Q. $6\times {10}^{-3}$ moles of $K_{2}C{r}_2{O}_7$ react completely with $9\times {10}^{-3}$ moles of $X^{n+}$ to give $X{O}_3^{-}$ and $C{r}^{3+}$. The value of $n$ is :

1. 1
2. 2
3. 3
4. None of these

Q.

Give two examples of reduction.

Q. In the reaction
$2Ag+2H_{2}S{O}_4\to A{g}_{2}S{O}_4+2H_{2}O+S{O}_2$
Sulphuric acid acts as

1. Oxidizing agent
2. Reducing agent
3. Oxidizing agent as well as reducing agent
4. None of the above

Q.

How do you count for the following observations?
Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction.

When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

Q.

When crystals of FeSO₄, are strongly heated the residue obtained is:

1. red in colour

2. blue in colour

3. green in colour

4. colourless

Q.

Justify giving reactions that among halogens, fluorine is the best oxidant and among hydrohalic compounds, hydroiodic acid is the best reductant.

Q.

If excess of ${\mathrm{AgNO}}_3$ solution is added to 100 mL of a 0.024 M solution of dichlorobis (enthylenediamine) cobalt (III) chloride, how many moles of $\mathrm{AgCl}$ be precipitated?

Q. Statement-I : Leaching of gold with cyanide ion in absence of air/$O_2$ leads to cyano complex of Au(III).
Statement-II : Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements, choose the correct answer from the options given below.