Group – 15 Elements
1 MARK QUESTIONS
1.
Which one of PCl4 and PCl4 is not likely to exist and why? [Delhi 2012]
2.
Complete the following chemical reaction equation:
P4
+
SO2Cl2
[Delhi 2012] 3.
Draw the structure of the following Molecule : H3 PO2 [Delhi 2012; All India 2012, 2009]
4.
Explain the following : The chemical reactivity of nitrogen is much less than that of phosphorus. [Foreign 2012; All India 2012; Delhi 2009, 2008C]
5.
Which is a stronger reducing agent, SbH3 or
BiH3 and why?
[All India 2012, 2011] 6.
NF3
is an exothermic compound whereas NCl3 is not. [All India 2012, 2011; Delhi 2011, 2011, 2010]
7.
Draw the molecular structure of N 2 O5 . [All India 2012, 2009]
8.
Complete the following equation Cu + HNO3 (dilute) [All India 2012; Foreign 2009]
9.
Phosphorus has' greater tendency for catenation than nitrogen. [All India 2012]
10.
What is the basicity of H3 PO2 and why? [All India 2012]
2
Group – 15 Elements
11.
The N—O bond in
NO 2
is shorter than the N —O bond in NO3 .
[Delhi 2011; All India 2011] 12.
All the P— Cl bonds in PCl5 , molecule are not equivalent [Delhi 2011; All India 2009, 2006C; Foreign 2006]
13.
Complete the following chemical equation. [Delhi 2011, 2010; Foreign 2011, 2010] P4
NaOH
H 2O
OR P4
14.
SO2Cl2
Tendency to form pent halides decreases down the group in group 15 of the Periodic Table. [Delhi 2011]
15.
Complete the following chemical equation : [Delhi 2011] l2
16.
HNO3 (conc.)
Draw the structure of HPO3 3 and why? [All India 2011, 2009; All India 2009C]
17.
Complete the following chemical equations. [Foreign 2012, 2011, 2010, 2009 All India 2011, 2009] HgCl2 + PH 3
18.
What is the basicity of H3 PO3 and why? [All India 2011]
3
Group – 15 Elements
19.
Mention optimum conditions for the Industrial manufacture of ammonia by Haber's process. [Foreign 2011; All India 2008]
20.
Red phosphorus is less reactive than white phosphorus. Why? [Foreign 2011; AB India 2008]
21.
Draw the structure of NF3 and H 3 PO3 molecules. [Foreign 2011]
22.
Nitrogen does not form penthalides. [All India 20HC, 2009; Delhi 2010; 2008C]
23.
Ammonia is more basic than phosphine. [All India 2011C; Delhi 2010, 2009, 2008]
24.
NH3 acts as a good ligand.
[Delhi 2011C] 25.
BiCl3 is less covalent than
PCl3 .
[Delhi 2011C] 26.
Why does NO2 dimerise? [Delhi 2010]
27.
The stability of + 5 oxidation state decreases down the group in group 15 of the Periodic Table. [Delhi 2010; Foreign 2009]
28.
Solid phosphorus pent chloride behaves as an ionic compound. [Delhi 2010, 2010C]
4
Group – 15 Elements
29.
Draw the structure of H 4 P2 O7 . [Delhi 2010]
30.
The stability of +3 state increases down the group in group 15 of the Periodic Table [Foreign 2010, 2009]
31.
Complete the following chemical reaction equations [Foreign 2010] AgCl (s) + NH3 (aq)
32.
Arrange the following in order of the increasing basic strength. [Delhi 2010, 2009C] PH 3 , NH3 , SbH3 ,
33.
AsH3
Draw the structure and predict the shape of H3 PO3 . [Delhi 2010C; All India 2006]
34.
N 2 is not particularly reactive, explain.
[Delhi 2010C] 35.
What is the covalence of nitrogen in
N 2 O5 ?
[All India 2010C] 36.
What happens when H3 PO3 (orthophosphorous acid) is heated? [All India 2011C]
37.
Nitrogen shows weaker tendency for Catenation than phosphorus. [All India 2010C, 2009; Foreign 2009]
38.
Complete the following chemical reaction equations. [Delhi 2009; Foreign 2009] 5
Group – 15 Elements P4 (
39.
is) + NaOH (aq) + H 2 O (I)
In the structure of HNO3 molecule, the N —O bond (121 pm) is shorter than N —OH bond (140 pm). [Delhi 2009; All India 2009]
40.
Draw the structure of PCl5 (s). [All India 2009, 2008]
41.
Ammonia has higher boiling point than phosphine. [All India 2009]
42.
Bi (V) is a stronger oxidizing agent than Sb (V). [All India 2009, 2008; Delhi 2006C]
43.
Complete the following reaction equation [Foreign 2009] PCl5 + H 2 O (excess)
44.
Give reason : PH 3 is a weaker base than NH3 [Delhi 2009C]
45.
Give reason: In the solid state, PCl5 behaves as an ionic species. [Delhi 2009C, 2006]
46.
The basic character of the hydrides of group 15 elements decreases with increasing B atomic numbers. [All India 2009]
47.
Complete the following reactions : [All India 2009] NH3 + NaOCI
48.
Write chemical equation for the following process : Orthophosphous acid is heated [Delhi 2008] 6
Group – 15 Elements
49.
Complete the following chemical equation : [Delhi 2008] Cu 2 (aq) + NH3 (aq)
50.
Complete the following chemical equation : [Delhi 2008, 2006] Ca3 P2 (s ) H 2O(l )
51.
Why the bond angle in is PH3 is lesser than that in NH3 molecule? [All India 2008]
52.
Ammonia has greater affinity for protons than phosphine( PH 3 ) [All India 2008]
53.
What happens when white phosphorus heated with cone, atmosphere?
NaOH solution in an inert gas
[All India 2008C] 54.
(i)
Write the reaction of thermal decomposition of sodium azide .
(ii)
What happens when PCI5 is healed? [Delhi 2007]
55.
How does ammonia react with a solution of Cu 2 ?
[All India 2007] 56.
H3 PO2 acts as a monobasic acid. Give reason.
[Foreign 2007; All India 2006] 57.
Nitric oxide becomes brown when released in air, why? [Delhi 2006]
7
Group – 15 Elements
58.
Write the chemical equations involved in the preparation of the H3 PO3 . [All India 2006]
59.
Concentrated nitric acid turns yellow on exposure to sunlight, why? [Foreign 2006]
60.
H3 PO3 is a diprotic acid. Give reason.
[Delhi 2006C] 2 MARKS QUESTIONS
61.
Explain the following observations: (i)
The molecules
(ii)
All the bonds in PCI5 molecule are no equivalent.
NH 3
and
NF3 have dipole moments which are of opposite direction.
[Delhi 2012] 62.
Draw the structures of white phosphorus and red phosphorus. Which one of these two types of phosphorus is more reactive and why? [Delhi 2010]
63.
Complete the following chemical reaction equations : [All India 2010]
64.
(i)
I2
+ conc. HNO3
(ii)
HgCl2 + PH3
(i)
PH 3 has lower boiling point Than NH3 , why?
[Delhi 2007] (ii)
Write balance equation, when ammonia is dissolved in water. [Delhi 2007]
65.
State the difference in properties of white and red phosphorus. [All India 2006C]
8
Group – 15 Elements
3 MARKS QUESTIONS
66.
Explain each of the following : (i)
Nitrogen is much less reactive that phosphorus.
(ii)
The stability of +5 oxidation state decreases down group 15.
(iii)
The bond angles (O—N—O) are not of the same value in
NO 2
and
NO 2
. [Delhi 2012]
5 MARKS QUESTIONS
67.
How is ammonia manufactured industrially? Draw flow chart for the manufacture of ammonia. Give any two uses. [All India 2007]
68.
(i)
Explain the Ostwald’s process to manufacture nitric acid.
[Delhi 2006C] (ii)
Write the balanced reaction when nitric acid react with (a) I 2 (b) C (c)
(iii)
S8
(d)
P4
Give any two uses.
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