Oxides of Group 16

Q.

Why does ammonia has higher boiling point than phosphine?

Q. The acidic, basic and amphoteric oxides respectively are :

1. $MgO,C{l}_{2}O,A{l}_2{O}_3$
2. $N_2{O}_3,L{i}_{2}O,A{l}_2{O}_3$
3. $N{a}_{2}O,S{O}_3,A{l}_2{O}_3$
4. $C{l}_{2}O,CaO,P_4{O}_{10}$

Q.

Give the reaction when sodium peroxide dissolved in water.

Q.

In the manufacture of Sulphuric acid , the key step is the catalytic oxidation of sulphur dioxide with Oxygen to give:

1. SO₃

2. H₂SO₃

3. S₂O₃

4. H₂S₂O₈

Q.

What is Beta-black phosphorous?

Q. What is the oxidation state of oxygen in CrO5 ?

Q.

At which temperature $\mathrm{\beta }-\mathrm{sulfur}$ is stable.

Q.

When ether is exposed to air for sometime an explosive substance obtained is

1. Oxide

2. Peroxide

3. TNT

4. Superoxide

Q. The common oxidation state for sulphur is :

1. 4
2. 6
3. both a and b
4. none of these

Q. The number of coordinate bonds presents in $S{O}_3$ molecule are:

1. 1
2. 2
3. 3
4. none of these

Q. Match list-I with list-II:

List-I (Molecule)	List-II (Bond order)
(a)$N{e}_2$	(i) 1
(b)$N_2$	(ii) 2
(c)$F_2$	(iii) 0
(d)$O_2$	(iv) 3

Choose the correct answer from the options given below

1. $\left(a\right)-\left(iv\right);\left(b\right)-\left(iii\right);\left(c\right)-\left(ii\right);\left(d\right)-\left(i\right)$
2. $\left(a\right)-\left(ii\right);\left(b\right)-\left(i\right);\left(c\right)-\left(iv\right);\left(d\right)-\left(iii\right)$
3. $\left(a\right)-\left(i\right);\left(b\right)-\left(ii\right);\left(c\right)-\left(iii\right);\left(d\right)-\left(iv\right)$
4. $\left(a\right)-\left(iii\right);\left(b\right)-\left(iv\right);\left(c\right)-\left(i\right);\left(d\right)-\left(ii\right)$

Q. The correct order of bond length of $O-O$ in $O_2,H_2{O}_2,O_3$ is:

1. $O_3>H_2{O}_2>O_2$
2. $O_2>H_2{O}_2>O_3$
3. $O_2>O_3>H_2{O}_2$
4. $H_2{O}_2>O_3>O_2$

Q. Which of the following correctly depicts the bond line and condensed structure of the compounds?

1. (i)
2. (i) (ii) and (iii)
3. (ii)
4. (i) and (ii)

Q. Compounds with oxygen in an oxidation state of __ are referred to as peroxide.

1. $-3$
2. $-2$
3. none of these
4. $-1$

Q.

Sodium nitrate decomposes above 800°C and does not give:

1. O₂

2. NO₂

3. Na₂O

4. N₂

Q. what is released when hydrogen sulfide is passed through oxygen?

1. water
2. sulphur dioxide
3. sulphur trioxide
4. hydrogen

Q. The correct statement(s) among the following are:
I The most stable form (allotropic) of sulphur at room temperature is rhombic.
II Ozone is an allotropic form of oxygen and is a powerful reducing agent.
III The formula of oleum is $H_2{S}_2{O}_7$.

1. I, II and III
2. III only
3. I and III only
4. II and III only

Q. The oxidation states of S atoms in $S_4{O}_6^{2-}$ from left to right respectively, are:

1. +6, 0, 0, +6
2. +3, 1, +1, +3
3. +5, 0, 0, +5
4. None of above

Q. Oxidation number of oxygen and fluroine of HOF?

Q. Non-metallic oxides are either ..... or ..... in nature.

1. Neutral, acidic
2. Neutral, basic
3. acidic, acidic
4. acidic, basic

Q. A liquid which in the presence of a catalyst evolves oxygen

Q. Which of the following can form adducts with lewis base?

1. $S{O}_2$
2. $Se{O}_3$
3. $S{O}_3$
4. $Se{O}_2$

Q. Which of the following is released in the manufacture of calcium silicate cement $\left(CaSi{O}_4\right)$?

1. Sulfur trioxide
2. Sulfur dioxide
3. Water gas
4. Oxygen gas

Q. The correct order of bond length of $O-O$ in $O_2,H_2{O}_2,O_3$ is:

1. $O_3>H_2{O}_2>O_2$
2. $O_2>H_2{O}_2>O_3$
3. $O_2>O_3>H_2{O}_2$
4. $H_2{O}_2>O_3>O_2$

Q.

Which of the following is correct order of bond length?

1. 

2. 

3. 

4. 

Q. In which of the following the bond angle is maximum:

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

Q.

Among the chalcogens, the element that forms an amphoteric dioxide is:

1. Selenium

2. Sulphur

3. Tellurium

4. Polonium

Q. Wny Na cannot exhibit +2 oxidation state

Q. calculate the weight of oxygen produced by thermal decomposition of 10g of potassium chlorate

Q. Which of the following oxides is most acidic?

1. $A{l}_2{O}_3$
2. $S{O}_3$
3. $Si{O}_2$
4. $P_2{O}_5$