Types of Redox Reactions

Q.

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black) oxygen gas and a brown gas $\mathrm{X}$ is formed.

(a) Write a balanced chemical equation of the reaction

(b) Identify the brown gas $\mathrm{X}$ evolved

(c) Identify the type of reaction

(d) What could be the pH range of the aqueous solution of the gas $\mathrm{X}$?

Q.

What type of reaction is $\mathrm{Al}+\mathrm{NaOH}$? What are the products formed?

Q.

what is law of reciprocal proportion

Q. Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :

Then the species undergoing disproportionation is:

1. $B{r}_2$
2. $Br{O}_4^{-}$
3. $Br{O}_3^{-}$
4. $HBrO$

Q.

How would you balance: $\mathrm{Al}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3+{\mathrm{H}}_2$

Q.

Why $C{O}_2$ is not considered as an organic compound?

Q.

Why in the redox titration of $KMn{O}_4$ vs oxalic acid, we heat oxalic acid solution before starting the titration ?

Q.

10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralize it will be.

1. 4 ml

2. 8 ml

3. 12 ml

4. 16 ml

Q. Which of the following is correct formula for calculation of n factor for disproportionation reaction.

1. $n_f=(n_f{)}_{\text{oxidation}}+(n_f{)}_{\text{reduction}}$
2. $\frac{1}{n_f}=\frac{1}{(n_f{)}_{\text{oxidation}}}+\frac{1}{(n_f{)}_{\text{reduction}}}$
3. None of these.
4. $n_f=(n_f{)}_{\text{oxidation}}^2+(n_f{)}_{\text{reduction}}^2$

Q.

Hydrogen and oxygen combine to form two compounds the hydrogen content in one is 5.93 % and in other it is 11.2% show that this explain law of multiple proportion

Q.

When solutions of barium chloride (aq) and sodium sulfate (aq) are mixed, what is/are the spectator ion(s)?

Q.

Sulphur dioxide reacts with chlorine in the presence of charcoal to give

1. Sulphuryl chloride

2. Sulphuric acid

3. Oleum

4. Sulphur trioxide

Q.

Can I get a list of all catalysts and their functions related to organic chemistry class 12th?

Q.

Calculate the Equivalent mass of Sulphuric Acid?

Q.

In the reaction, ${\mathrm{Br}}_2+2{\mathrm{I}}^{-}\to 2{\mathrm{Br}}^{-}+{\mathrm{I}}_2$, the oxidizing agent is-

1. ${\mathrm{Br}}_2$

2. ${\mathrm{I}}^{-}$

3. $\mathrm{Br}$

4. ${\mathrm{I}}_2$

Q. $K_{2}C{r}_2{O}_7$ in acidic medium converts into

1. $C{r}^{4+}$
2. $C{r}^{2+}$
3. $C{r}^{3+}$
4. $C{r}^{5+}$

Q. Propene, $C{H}_3-CH=C{H}_2$ can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to make this conversion happen?

1. Alkaline $KMn{O}_4$
2. $O_3/\text{Zn dust}$
3. $Os{O}_4$
4. $B_2{H}_6$ and alkaline $H_2{O}_2$

Q. How to balance the equation by redox reaction by ion -electron method in basic medium

Q. A current of 2.0 A passed for 5 hours through a molten metal salt deposits 22.2 g of metal (At. wt. = 177). The oxidation state of the metal in the metal salt is:

1. 1
2. 2
3. 3
4. 4

Q. During the disproportionation of Iodine to iodide and iodate ions, the ratio of iodate and iodide ions formed in alkaline medium is:

$I_2\to I{O}_3^{-}+I^{-}$

1. 1 : 5
2. 5 : 1
3. 3 : 1
4. 1 : 3

Q.

Why is Copper (II) nitrate blue?

Q.

The $M{n}^{3+}$ ion is unstable in solution and undergoes disproportionation to give $M{n}^{2+}.Mn{O}_2$ and $H^{+}$ ion. Write a balanced ionic equation for the reaction.

Q.

What does the reaction ${\mathrm{H}}_2\mathrm{S}+{\mathrm{H}}_2{\mathrm{O}}_2\to \mathrm{S}+2{\mathrm{H}}_2\mathrm{O}$manifest?

Q.

Is colloidal solution homogeneous or heterogeneous?

Q.

When moist chlorine reacts with hydrogen sulfide, two products are formed:

A gas which fumes in moist air and, a yellow solid. Name these products.

Q.

An element A in a compound ABD has oxidation number A ^n-. It is oxidised by $C{r}_2{O}_7^{-2}$ in acidic medium. In the experiment 1.68$\times$${10}^{-3}$ x moles of$K_{2}C{r}_2{O}_7$ were used for 3.26$\times$${10}^{-3}$ moles of ABD. The new oxidation number of A after oxidation is:

1. +n

2. 3

3. 3-n

4. n-3

Q. Which of the following process represents disproportionation reaction?

1. $Cu+4HN{O}_3\to Cu(N{O}_3{)}_2+2N{O}_2+2H_{2}O$
2. $3I_2+6O{H}^{-}\to I{O}_3^{-}+5I^{-}+3H_{2}O$
3. $C{l}_2+I_2\to 2ICl$
4. $Zn+2HCl\to ZnC{l}_2+H_2$

Q. Which of the following reactions are comproportionation reactions?

1. $2H_{2}S\left(g\right)+S{O}_2\left(g\right)\to 3S\left(s\right)+2H_{2}O\left(g\right)$
2. $2A{g}^{2+}\left(aq\right)+Ag\left(s\right)\to 2A{g}^{+}\left(g\right)$
3. $CaC{O}_3\left(s\right)\stackrel{\Delta }{\to }CaO\left(s\right)+C{O}_2\left(g\right)$
4. $H_2\left(g\right)+I_2\left(g\right)\to 2HI\left(g\right)$

Q. Which of the following is not an intramolecular redox reaction?

1. $2KCl{O}_3\to 2KCl+3O_2$
2. $2M{n}_2{O}_7\to 4Mn{O}_2+3O_2$
3. $2H_2{O}_2\to 2H_{2}O+O_2$
4. None of the above

Q. What is an example of a single replacement reaction?

1. $A+X\to AX$
2. $AX\to A+X$
3. $A+BX\to AX+B$
4. $AX+BY\to AY+BX$
5. $A+X\to B+Y$