Oxidising and Reducing Nature

Q. If $10$ volumes of dihydrogen gas react with five volumes of dioxygen gas, how many volumes of water vapor would be produced?

Q. a first ordre rection has a rate constant of 2.303 into 10 power minus 3.the time required for 40 g of reactant to reduce to 10 g will be

Q.

What is the oxidation number of $\mathrm{N}$ in ${\mathrm{HNO}}_3$?

Q.

What is the oxidation number of $\mathrm{N}$ in $\mathrm{NO}$?

Q.

Which among the following does not disproportionate in the alkaline medium?
${\mathrm{F}}_2,{\mathrm{Cl}}_2,{\mathrm{S}}_8,{\mathrm{P}}_4$

Q.

What is the oxidation number of H in ${\mathrm{H}}_2\mathrm{O}$?

Q.

Which of the following will have highest density?

1. CHCl₃

2. CCl₄

3. CH₃Cl

4. CH₂Cl₂

Q. Least stable hydride is:

1. Stannane
2. Silane
3. Plumbane
4. Germane

Q. The reducing power of divalent species decreases in the order

1. $G{e}^{2+}>S{n}^{2+}>P{b}^{2+}$
2. $S{n}^{2+}>G{e}^{2+}>P{b}^{2+}$
3. $P{b}^{2+}>S{n}^{2+}>G{e}^{2+}$
4. None of these

Q.

It is because of the inability of $n{s}^2$ electrons of the valence shell to participate in bonding that

1. $S{n}^{2+}$ is oxidizing while $P{b}^{2+}$ is reducing

2. $S{n}^{2+}$ and $P{b}^{2+}$ are both oxidizing and reducing

3. $S{n}^{4+}$ is reducing while $P{b}^{4+}$is oxidizing

4. $S{n}^{2+}$ is reducing while $P{b}^{4+}$is oxidizing

Q.

Rationalise the given statements and give chemical reactions:
• Lead (II) chloride reacts with $C{l}_2$ to give $PbC{l}_4$.
• Lead (IV) chloride is highly unstable towards heat.
• Lead is known not to form an iodide, $Pb{I}_4$.

Q. KP for the following reaction at 700k is 1.3*10^-3. The Kc at the same temperature for the reaction
2SO2 + O2 gives 2SO3 will be
Answer
Kc = 1.3*10^-3/(0.0821*700)^{-1 =} 7.4*10^-2
I want to know in (0.0821*700)^-1 means what especially power minus one means

Q. $Pb{F}_4,PbC{l}_4$ exists but $PbB{r}_4$ and $Pb{I}_4$ do not exist because of:

1. Strong reducing character of $P{b}^{4+}$
2. Low electronegativity of $B{r}^{–}and{I}^{–}$
3. Large size of $B{r}^{–}and{I}^{–}$
4. Strong oxidising character of $P{b}^{4+}$

Q. Ge(II) compounds are powerful reducing agents whereas Pb(IV) compounds are strong oxidants. It is because

1. $\text{Pb is more electropositive than Ge}$
2. $\text{Ionic radii of}P{b}^{2+}\text{and}P{b}^{4+}\text{are larger than those of}G{e}^{2+}\text{and}G{e}^{4+}$
3. $\text{Ionization potential of lead is less than that of Ge}$
4. $\text{Lead is heavier than Germanium}$

Q. Given that $E^0$ values of $A{g}^{+}/Ag,K^{+}/K,M{g}^{2+}/Mg$ and $C{r}^{3+}/Cr$ are $0.80V,-2.90V,-2.37V$ and $-0.74V$ respectively. Which of the following orders regarding the reducing power of the metals is correct?

1. $Ag>Cr>Mg>K$
2. $Ag<Cr<Mg<K$
3. $Ag>Cr>K>Mg$
4. $Cr>Ag>Mg>K$

Q. When acidified $K_{2}C{r}_2{O}_7$ solution is added to $S{n}^{2+}$ changes to:

1. $S{n}^{4+}$
2. $S{n}^{+}$
3. $S{n}^{3+}$
4. $Sn$

Q. Element which act as a strong oxidising agent in its +4 oxidation state is

1. C
2. Sn
3. Pb
4. Si

Q. The most commonly used reducing agent among the following is

1. $AlC{l}_3$
2. $PbC{l}_2$
3. $SnC{l}_4$
4. $SnC{l}_2$

Q.

Discuss the pattern of variation in the oxidation states of
$BtoTl$

$CtoPb$

Q.

What is the oxidation number of manganese in ${\mathrm{MnO}}_4^{-}$, ${\mathrm{Mn}}_2{\mathrm{O}}_3$, and ${\mathrm{MnO}}_2$?

Q.

State one appropriate observation.

Excess Chlorine gas reacted with Ammonia gas.

Q.

Each of the following ions contains vanadium in a +5 oxidation state except:

1. ${\mathrm{VO}}^{2+}$

2. $\mathrm{V}{\left(\mathrm{OH}\right)}^{4+}$

3. ${{\mathrm{VO}}_2}^{+1}$

4. ${\left[{\mathrm{VO}}_3\mathrm{OH}\right]}^{2-}$

Q. An oxy-acid of phosphorous is prepared by hydrolysis and oxidation of red P by $NaOCl$ or yellow P by $H_{2}O$ and air. What is the basicity of the oxyacid?

Q. Convert:
(d) aluminium carbide into methane.

Q.

For elements A, B and C the standard reduction potential are +0.65V , -2.25V and -0.45V respectively. The correct order of their reducing power is:

1. A>C>B

2. B>C>A

3. C>B>A

4. A>B>C

Q. Why $PbC{l}_4$ exist but $Pb{I}_4$ doesn't ?

1. because $I^{-}$ get oxidised to $I_2$
2. because $I^{-}$ is a strong reducing agent
3. because $I_2$ is a gas
4. because $I^{-}$ is a strong oxidising agent

Q.

The correct order of the oxidizing power of Cl₂, Br₂, I₂ and O₂ is:

1. Cl₂>Br₂>I₂>O₂

2. O₂>I₂>Cl₂>Br₂

3. Cl₂>Br₂>O₂>I₂

4. I₂>O₂>Br₂>Cl₂

Q. Why $PbC{l}_4$ exist but $Pb{I}_4$ doesn't ?

1. because Iodine has electronegativity value
2. because $I^{-}$ is a strong reducing agent
3. because $I_2$ is a gas
4. because Iodine has large size

Q.

Which is more stable ${\mathrm{PbCl}}_2\mathrm{or}{\mathrm{PbCl}}_4$?

Q. Assertion :Manganese (atomic number 25) has a less favourable electron affinity than its neighbours on either side. Reason: The manganese has stable, $[Ar{]}^{18}3d^{5}4s^2$ electrons configuration.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct