Lead Dioxide and Lead Tetraoxide

Q. Bleaching action of chlorine is due to

1. Oxidation
2. Reduction
3. Hydrolysis
4. Acidic nature

Q. The poisonous gas ‘Lewisite’ is obtained by reaction of

1. 
2. 
3. 
4. 

Q.

Which of the following is the correct statement for red lead

1. It is an active form of lead

2. Its molecular formula is $P{b}_2{O}_3$

3. It decomposes into Pb and $C{O}_2$

4. It decomposes into PbO and $O_2$

Q. Explain Kolbe's reaction with one example.

Q. Write the structure of the foul-smelling compound obtained when aniline is treated with chloroform in the presence of $KOH$.

Q. Consider the following sequence of reactions.
$C_6{H}_{5}N{H}_2\underset{Heat}{\overset{{Ac}_{2}O}{\to }}A\underset{\begin{array}{c}Conc.H_{2}S{O}_4\\ 0-{15}^{o}C\end{array}}{\overset{Conc.HN{O}_3}{\to }}\underset{\left(Minor\right)}{B}\underset{Heat}{\overset{aq.H_{2}S{O}_4}{\to }}\underset{\left(Major\right)}{C}$
The major product $\left(C\right)$ is:

1. 2, 4, 6-trinitroaniline
2. p-nitroacetanilide
3. p-nitroaniline
4. m-nitroaniline

Q. When $Pb{O}_2$ reacts with conc $HN{O}_3$, the gas evolved is:

1. $N{O}_2$
2. $O_2$
3. $N_2$
4. $N_{2}O$

Q.

Lead (IV) Oxide is:

1. a good oxidizing agent

2. used in lead-acid batteries

3. is amphoteric

4. all of the above

Q. When oxalic acid reacts with conc. $H_{2}S{O}_4$, two gases produced are neutral and acidic in nature respectively. Potassium hydroxide absorbs one of the two gases. The product formed during this absorption and the gas which gets absorbed are respectively:

1. $K_{2}C{O}_3$ and $C{O}_2$
2. $K_{2}C{O}_3$ and $CO$
3. $KHC{O}_3$ and $CO$
4. $KHC{O}_3$ and $C{O}_2$

Q. Number of moles of $SnC{l}_2$ required for the reduction of $K_{2}C{r}_2{O}_7$ into $C{r}_2{O}_3$ is (in acidic medium) :

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

Q. The gas which has no effect on acidified $K_{2}C{r}_2{O}_7$ or $KMn{O}_4$ is :

1. $C{O}_2$
2. $S{O}_2$
3. $N{O}_2$
4. $H_2$

Q. When sulphur is burnt in air, the product obtained is:

1. $H_{2}S$
2. $S{O}_3$
3. $S{O}_2$
4. all of these

Q. At $673K$, which is the better reducing agent carbon or carbon monoxide?

Q.

Which of the following is the correct statement for red lead

1. It is an active form of lead

2. Its molecular formula is Pb₂O₃

3. It decomposes into Pb and CO₂

4. It decomposes into PbO and O₂

Q. Red lead is :

1. PbO
2. HgS
3. $Pb{O}_2$
4. $P{b}_3{O}_4$

Q. Which is the correct statement for red lead

1. It decomposes into
2. 
   Its molecular formula is
3. It decomposes into
4. Its an active form of lead

Q.

$(C{H}_{3}COO{)}_{2}Pb+Ca(OH{)}_2\to A+(C{H}_{3}COO{)}_{2}Ca$

$A+CaOC{l}_2\to B+CaC{l}_2+H_{2}O$

Identify A and B.

1. $PbO$

2. $P{b}_{2}O$

3. $Pb(OH{)}_2$

4. $Pb{O}_2$

Q.

$(C{H}_{3}COO{)}_{2}Pb+Ca(OH{)}_2\to A+(C{H}_{3}COO{)}_{2}Ca$

$A+CaOC{l}_2\to B+CaC{l}_2+H_{2}O$

Identify A and B.

1. 

2. 

3. 

4. 

Q. A mixture of $N{a}_{2}C{O}_3$ and $N{a}_{2}S{O}_3$ is treated with dilute $H_{2}S{O}_4$ in a setup such that the gaseous mixture emerging can pass first through a solution of $BaC{l}_2$ and then gases mixture passes through acidified $K_{2}C{r}_2{O}_7$. Which of the following will you observe?

1. The $BaC{l}_2$ solution remains unaffected and the acidified dichromate solution turns green
2. The $BaC{l}_2$ solution gives a white precipitate and the acidified dichromate solution remains unaffected
3. The $BaC{l}_2$ solution gives a white precipitate and the acidified dichromate solution turns green
4. Both the solutions remain unaffected

Q. Lead sulphide in dilute nitric acid gives :

1. lead nitrate
2. sulphur dioxide
3. sulphur trioxide
4. colloidal sulphur

Q. When $Pb{O}_2$ reacts with conc $HN{O}_3$, the gas evolved is:

1. NO₂

2. O₂

3. N₂

4. N₂O

Q. Chromyl chloride vapours are dissolved in water and solution is treated with acetic acid and lead acetate solution is added, then :

1. the solution will become dark green
2. the solution will remain colourless
3. a yellow solution will be obtained
4. a yellow precipitate will be obtained

Q. $H_2$ gas is liberated when $H_2{O}_2$ reacts with:

1. $O_3$
2. $HCHO$
3. acidified $KMn{O}_4$
4. acidified $K_{2}C{r}_2{O}_7$

Q. Write the main products of the following reactions:
(i) $C_6{H}_5{N}_2^{+}C{l}^{-}\stackrel{H_{3}P{O}_2+H_{2}O}{\to }$?

Q.

The only element that exhibits positive SRP value is _______

1. V
2. Zn
3. Fe
4. Cu

Q. Acids of boron on heating with alcohol in presence of conc. $H_{2}S{O}_4$ gives:

1. non-volatile esters
2. non-volatile ethers
3. volatile esters
4. volatile ethers

Q.

Match List I with List II and select the correct answer using the codes given below the lists

1. A B C D

   4 3 2 1

2. A B C D

   3 2 1 4

3. A B C D

   4 2 3 1

4. A B C D

   4 1 2 3

Q. Litharged is chemically:

1. $PbO$
2. $Pb{O}_2$
3. $P{b}_3{O}_4$
4. $(C{H}_{3}COO{)}_{2}Pb$

Q. Which of the following statements is/are incorrect?

1. Ammonia is oxidisied to $N{O}_2$ by oxygen at ${800}^{o}C$ in presence of a catalyst platinum
2. Nitric acid on standing slowly turns yellow
3. $N_2{O}_3$ gas dissolves in water giving a pale blue solution
4. Colloidal sulphur is formed when $H_{2}S$ gas is passed through nitric acid solution

Q. In the test for iodine, when $I_2$ is treated with sodium thiosulphate $N{a}_2{S}_2{O}_3$.

1. $N{a}_2{S}_4{O}_6$
2. $N{a}_{2}S{O}_4$
3. $N{A}_{3}IS{O}_4$
4. $N{a}_{2}S$