Properties and Reactions of Sodium Peroxide

Q.

The linear structure is assumed by__?

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

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

3. ${\mathrm{NO}}_2^{+}$

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

Q. Which of the following does not contain the true peroxide ion?

1. $N{a}_2{O}_2$
2. $H_2{O}_2$
3. $Ba{O}_2$
4. $Sr{O}_2$

Q. On combustion in excess of air sodium mainly forms:

1. $Na{O}_3$
2. None
3. $N{a}_{2}O$
4. $N{a}_2{O}_2$

Q. 1) $N{a}_2{O}_2\underset{0{}^{o}C}{\overset{Water}{\to }}P+Q$

2) $N{a}_2{O}_2\underset{25{}^{o}C}{\overset{Water}{\to }}P+R\uparrow +S$
Calculate the sum of bond orders between same bonded atoms in Q and R compounds.

Q. Two test tubes containing nitrate and bromide are treated separately with conc. $H_{2}S{O}_4$; brown fumes evolved are passed in water. The water will be coloured by vapours evolved from the test tube containing

1. 
   Nitrate
2. 
   Bromide
3. 
   Both (A) and (B)
4. 
   None of these

Q. $200cc$ of acetylene is formed form a certain mass of calcium carbide. Find the volume of oxygen required and carbon dioxide formed during its complete combustion. The combustion reaction can be represented as:

1. 500 cc, 400 cc
2. 600 cc, 400 cc
3. 600 cc, 500 cc
4. 700 cc, 500 cc

Q.

Statement-1: Hydrogen is inflammable and combustible gas.
Statement-2: It burns with blue flame in $O_2$ but does not support burning.

1. Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
2. Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1
3. Statement-1 is true, Statement-2 is false
4. Statement-1 is false, Statement-2 is true

Q. Which of the following statement is incorrect about the properties of $CuC{l}_2$?

1. It crystallised as $CuC{l}_2.2H_{2}O$ of emerald green colour
2. Its dilute solution is green in colour due to formation of $\left[Cu\right(H_{2}O{)}_6{]}^{2+}$ complex
3. On addition of $KCl$ to its solution, colour changes into yellow due to the formation of $[CuC{l}_4{]}^{2-}$
4. Its concentrated aqueous solution is green because of formation of $\left[Cu\right(H_{2}O{)}_6{]}^{2+}$ and $[CuC{l}_4{]}^{2-}$ complexes

Q. A soft silver-white metal 'A' burns with a golden-yellow flame to give a yellow power 'B, ' which on treatment with water gives a clear solution 'C'. The solution placed on $Al$ attacks this metal, liberating a gas 'D' forming a water-soluble compound 'E'. The metal 'A' dissolves in liquid $N{H}_3$ to form a deep-blue solution which is a good conductor and an excellent reducing agent. Identify 'C':

1. $KOH$
2. $Al(OH{)}_3$
3. $NaOH$
4. $LiOH$

Q. $N{a}_2{O}_2$ is an oxide of alkali metal which is used in life saving devices.
If true enter 1, else enter 0.

Q.

To an acidified dichromate solution, Na₂O₂ is added and shaken. What is observed?

1. Bluish-given precipitate

2. Blue colour

3. Copious evolution of oxygen

4. Orange colour changing to green directly

Q. What is the colour of flame when $H_{2}S$ burns with $O_2$?

1. Green
2. Pink
3. Blue
4. Magenta

Q. Write the correct balance chemical for the following reaction:

1. H${}_2$SO${}_4$(aq) + 2Al(s) $\to$ Al${}_2$(SO${}_4$)${}_3$(aq) + H${}_2$
2. H${}_2$SO${}_4$(aq) + 4Al(s) $\to$2 Al${}_2$(SO${}_4$)${}_3$(aq) + 3H${}_2$
3. 3H${}_2$SO${}_4$(aq) + 2Al(s) $\to$ Al${}_2$(SO${}_4$)${}_3$(aq) + 3H${}_2$
4. 3H${}_2$SO${}_4$(aq) + Al(s) $\to$ Al${}_2$(SO${}_4$)${}_2$(aq) + 3H${}_2$

Q. Identify F:

1. $HF$
2. $N{H}_3$
3. $H{N}_3$
4. None ofthese

Q. It is a pale yellow powder, but on exposure to moisture and $C{O}_2$ it turns to white. What are we talking about?

1. NaOH

2. Na₂O₂

3. Na₂O

4. 

Q. Oxone is:

1. $CaO$
2. $N_{2}O$
3. $N{a}_2{O}_2$
4. $NaB{O}_3$

Q. Conc. $HN{O}_3$ can be stored in a container made of:

1. Al
2. Cu
3. Zn
4. Sn

Q. Formation of a green-edged flame on igniting the vapors evolved by heating a given inorganic salt with a few ml of ethyl alcohol and conc. $H_{2}S{O}_4$ indicates the presence of a:

1. tartrate
2. oxalate
3. borate
4. acetate

Q.

In order to obtain $1$ tonne of aluminum, the following inputs are required: four tonnes of bauxite, $150Kg$ of sodium hydroxide, and $600Kg$ of graphite. The aluminum compound in bauxite is aluminum oxide and the main impurity is iron $\left(III\right)$ oxide. Aluminum is obtained by the electrolysis of aluminum oxide dissolved in cryolite.

When bauxite is treated with sodium hydroxide solution what happens to:

aluminum oxide?

Q. The function of anhydrous aluminium chloride in the Friedel-Crafts reaction is to:

1. Absorb water
2. Produce an electrophile
3. Acts as Lewis base
4. Produce nucleophile

Q. Which of the following compounds (s) give(s) $N_2$ gas on heating?

1. $N{H}_{4}Cl{O}_3$
2. $N{H}_{4}Cl{O}_4$
3. $N{H}_{4}N{O}_3$
4. $N{H}_{4}Cl$

Q. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $A$ and an alkaline solution. The solution on exposure to air the produces a thin solid layer of $B$ on the surface. Now that thin layer is peeled off and reacted with sulphuric acid and allowed to cool down and gain its water of hydration}. This compound is heated to $1000K$ to give a black coloured compound $X$ along with an acidic gas ($Y$).
$Y$ in aqueous solution along with $H_{2}S$ turn the solution yellow. Gas $A$ is :

1. key ingredient for the formation of iodide of millions base
2. carbon dioxide
3. belonging to group zero in analysis of cations
4. sulphur dioxide

Q.

Sodium acts as as a strong reducing agent. Which of the following reaction/ reactions exemplifies this behaviour.

1. 

2. 

3. 

4. 

Q. Identify $\left(C\right)$ :

1. $N_2$
2. $H_2$
3. $O_2$
4. $N_{2}O$

Q. A soft silver-white metal (A) burns with a golden-yellow flame to give a yellow powder (B) which on treatment with water liberates oxygen giving a clear solution (C). The solution, when mixed with $Al$, attacks the metal, liberating a gas (D) and forming a water-soluble compound (E). The metal (A) dissolves in liquid $N{H}_3$ to form a deep blue solution which is a good conductor and an excellent reducing agent. Identify E:

1. $NaOH$
2. $NaAl{O}_2$
3. $Ca(Al{O}_2{)}_2$
4. None of these

Q.

$4D_{2}O+3Fe\stackrel{red-hot}{\to }F{e}_3{O}_4+gas.$ The gas produced in the above reaction is:

1. $H_2$
2. $D_2$
3. none
4. $O_2$

Q. An element X when heated is oxygen, above 300 ${}^{\circ }C$ burns with a pale blue flame to give a colourless gas Y and traces of gas Z. Identify X, Y and Z.

Q. Calculate the sum of bond orders between same bonded atoms in $Q$ and $R$ compounds.

Q. Which of the following is not formed when $H_{2}S$ reacts with acidic $K_{2}C{r}_2{O}_7$ solution?

1. $S$
2. $C{r}_2(S{O}_4{)}_3$
3. $CrS{O}_4$
4. $H_{2}O$

Q. A soft silver-white metal (A) burns with a golden-yellow flame to give a yellow powder (B) which on treatment with water liberates oxygen giving a clear solution (C). The solution, when mixed with $Al$, attacks the metal, liberating a gas (D) and forming a water-soluble compound (E). The metal (A) dissolves in liquid $N{H}_3$ to form a deep blue solution which is a good conductor and an excellent reducing agent. Identify (D):

1. $N_2$
2. $C{l}_2$
3. $N{H}_3$
4. $H_2$