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P-block Elements (Group 15,16,17 and 18) Practice Questions - DPP for NEET

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1. The oxyacid of phosphorous in which phosphorous has the lowest
oxidation state is
(a) hypophosphorous acid
(b) orthophosphoric acid
(c) pyrophosphoric acid
(d) metaphosphoric acid
2. The decreasing values of bond angles from NH
3
 (106º) to SbH
3
 (101º)
down group-15 of the periodic table is due to
(a) decreasing lp-bp repulsion
(b) decreasing electronegativity
(c) increasing bp-bp repulsion
(d) increasing p-orbital character in sp
3
3. The deep blue colour produced on adding excess of ammonia to copper
sulphate is due to  presence of
(a)
Page 2


1. The oxyacid of phosphorous in which phosphorous has the lowest
oxidation state is
(a) hypophosphorous acid
(b) orthophosphoric acid
(c) pyrophosphoric acid
(d) metaphosphoric acid
2. The decreasing values of bond angles from NH
3
 (106º) to SbH
3
 (101º)
down group-15 of the periodic table is due to
(a) decreasing lp-bp repulsion
(b) decreasing electronegativity
(c) increasing bp-bp repulsion
(d) increasing p-orbital character in sp
3
3. The deep blue colour produced on adding excess of ammonia to copper
sulphate is due to  presence of
(a)
(b)
(c)
(d)
4. In nitroprusside ion, the iron and NO exist as Fe
++
 and NO
+
 rather than
Fe
+++
 and NO. These forms can be differentiated
by
(a) estimating the concentration of iron
(b) measuring the concentration of 
(c) measuring the solid state magnetic moment
(d) thermally decomposing the compound
5. The brown ring test for  and  is due to the formation of
complex ion with a formula
(a) [Fe(H
2
O)
6
]
2+
(b) [Fe(NO)(CN)
5
]
2+
(c) [Fe(H
2
O)
5
NO]
2+
(d) [Fe(H
2
O)(NO)
5
]
2+
6. Concentrated hydrochloric acid when kept in open air sometimes
produces a cloud of white fumes. The explanation for it is that
(a) oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine
gas
(b) strong affinity of HCl gas for moisture in air results in forming of droplets
of liquid solution which appears like a cloudy smoke.
(c) due to strong affinity for water, concentrated hydrochloric acid pulls
moisture of air towards itself. This moisture forms droplets of
water and hence the cloud.
(d) concentrated hydrochloric acid emits strongly smelling HCl gas all the
Page 3


1. The oxyacid of phosphorous in which phosphorous has the lowest
oxidation state is
(a) hypophosphorous acid
(b) orthophosphoric acid
(c) pyrophosphoric acid
(d) metaphosphoric acid
2. The decreasing values of bond angles from NH
3
 (106º) to SbH
3
 (101º)
down group-15 of the periodic table is due to
(a) decreasing lp-bp repulsion
(b) decreasing electronegativity
(c) increasing bp-bp repulsion
(d) increasing p-orbital character in sp
3
3. The deep blue colour produced on adding excess of ammonia to copper
sulphate is due to  presence of
(a)
(b)
(c)
(d)
4. In nitroprusside ion, the iron and NO exist as Fe
++
 and NO
+
 rather than
Fe
+++
 and NO. These forms can be differentiated
by
(a) estimating the concentration of iron
(b) measuring the concentration of 
(c) measuring the solid state magnetic moment
(d) thermally decomposing the compound
5. The brown ring test for  and  is due to the formation of
complex ion with a formula
(a) [Fe(H
2
O)
6
]
2+
(b) [Fe(NO)(CN)
5
]
2+
(c) [Fe(H
2
O)
5
NO]
2+
(d) [Fe(H
2
O)(NO)
5
]
2+
6. Concentrated hydrochloric acid when kept in open air sometimes
produces a cloud of white fumes. The explanation for it is that
(a) oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine
gas
(b) strong affinity of HCl gas for moisture in air results in forming of droplets
of liquid solution which appears like a cloudy smoke.
(c) due to strong affinity for water, concentrated hydrochloric acid pulls
moisture of air towards itself. This moisture forms droplets of
water and hence the cloud.
(d) concentrated hydrochloric acid emits strongly smelling HCl gas all the
time.
7. The hybridization in ICl
7
 is
(a) sp
3
d
3
(b) d
2
sp
3
(c) sp
3
d
(d) sp
3
8. The compound of sulphur that can be used as refrigerant is
(a) SO
2
(b) SO
3
(c) S
2
Cl
2
(d) H
2
SO
4
9. Which of the following is a saline oxide ?
(a) Na
2
O
2
(b) BaO
2
(c) Na
2
O
(d) Fe
2
O
3
10. Which one of the following substances has the highest proton affinity ?
(a) H
2
S (b) NH
3
(c) PH
3
(d)  H
2
O
11. Which one of the following statement regarding helium is incorrect ?
(a) It is used to produce and sustain powerful superconducting magnets
(b) It is used as a cryogenic agent for carrying out experiments at low
temperatures
(c) It is used to fill gas balloons instead of hydrogen because it is lighter and
Page 4


1. The oxyacid of phosphorous in which phosphorous has the lowest
oxidation state is
(a) hypophosphorous acid
(b) orthophosphoric acid
(c) pyrophosphoric acid
(d) metaphosphoric acid
2. The decreasing values of bond angles from NH
3
 (106º) to SbH
3
 (101º)
down group-15 of the periodic table is due to
(a) decreasing lp-bp repulsion
(b) decreasing electronegativity
(c) increasing bp-bp repulsion
(d) increasing p-orbital character in sp
3
3. The deep blue colour produced on adding excess of ammonia to copper
sulphate is due to  presence of
(a)
(b)
(c)
(d)
4. In nitroprusside ion, the iron and NO exist as Fe
++
 and NO
+
 rather than
Fe
+++
 and NO. These forms can be differentiated
by
(a) estimating the concentration of iron
(b) measuring the concentration of 
(c) measuring the solid state magnetic moment
(d) thermally decomposing the compound
5. The brown ring test for  and  is due to the formation of
complex ion with a formula
(a) [Fe(H
2
O)
6
]
2+
(b) [Fe(NO)(CN)
5
]
2+
(c) [Fe(H
2
O)
5
NO]
2+
(d) [Fe(H
2
O)(NO)
5
]
2+
6. Concentrated hydrochloric acid when kept in open air sometimes
produces a cloud of white fumes. The explanation for it is that
(a) oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine
gas
(b) strong affinity of HCl gas for moisture in air results in forming of droplets
of liquid solution which appears like a cloudy smoke.
(c) due to strong affinity for water, concentrated hydrochloric acid pulls
moisture of air towards itself. This moisture forms droplets of
water and hence the cloud.
(d) concentrated hydrochloric acid emits strongly smelling HCl gas all the
time.
7. The hybridization in ICl
7
 is
(a) sp
3
d
3
(b) d
2
sp
3
(c) sp
3
d
(d) sp
3
8. The compound of sulphur that can be used as refrigerant is
(a) SO
2
(b) SO
3
(c) S
2
Cl
2
(d) H
2
SO
4
9. Which of the following is a saline oxide ?
(a) Na
2
O
2
(b) BaO
2
(c) Na
2
O
(d) Fe
2
O
3
10. Which one of the following substances has the highest proton affinity ?
(a) H
2
S (b) NH
3
(c) PH
3
(d)  H
2
O
11. Which one of the following statement regarding helium is incorrect ?
(a) It is used to produce and sustain powerful superconducting magnets
(b) It is used as a cryogenic agent for carrying out experiments at low
temperatures
(c) It is used to fill gas balloons instead of hydrogen because it is lighter and
non-inflammable
(d) It is used in gas-cooled nuclear reactors
12. The acid which forms two series of salts is
(a) H
3
PO
4
(b) H
3
PO
3
(c) H
3
BO
3
(d)
13. Gaseous HCl is a poor conductor of  electricity while its aqueous
solution is a good conductor this is because
(a) is a good conductor of electricity
(b) a gas cannot conduct electricity but a liquid can
(c) HCl gas does not obey Ohm’s law, whereas the solution does
(d) HCl ionises in aqueous solution
14. The number of hydrogen atom(s) attached to phosphorus atom in
hypophosphorous acid is
(a) three
(b) one
(c) two
(d) zero
15. What products are expected from the disproportionation reaction of
hypochlorous acid?
(a) HCl and Cl
2
O
(b) HCl and HClO
3
(c) HClO
3
 and Cl
2
O
Page 5


1. The oxyacid of phosphorous in which phosphorous has the lowest
oxidation state is
(a) hypophosphorous acid
(b) orthophosphoric acid
(c) pyrophosphoric acid
(d) metaphosphoric acid
2. The decreasing values of bond angles from NH
3
 (106º) to SbH
3
 (101º)
down group-15 of the periodic table is due to
(a) decreasing lp-bp repulsion
(b) decreasing electronegativity
(c) increasing bp-bp repulsion
(d) increasing p-orbital character in sp
3
3. The deep blue colour produced on adding excess of ammonia to copper
sulphate is due to  presence of
(a)
(b)
(c)
(d)
4. In nitroprusside ion, the iron and NO exist as Fe
++
 and NO
+
 rather than
Fe
+++
 and NO. These forms can be differentiated
by
(a) estimating the concentration of iron
(b) measuring the concentration of 
(c) measuring the solid state magnetic moment
(d) thermally decomposing the compound
5. The brown ring test for  and  is due to the formation of
complex ion with a formula
(a) [Fe(H
2
O)
6
]
2+
(b) [Fe(NO)(CN)
5
]
2+
(c) [Fe(H
2
O)
5
NO]
2+
(d) [Fe(H
2
O)(NO)
5
]
2+
6. Concentrated hydrochloric acid when kept in open air sometimes
produces a cloud of white fumes. The explanation for it is that
(a) oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine
gas
(b) strong affinity of HCl gas for moisture in air results in forming of droplets
of liquid solution which appears like a cloudy smoke.
(c) due to strong affinity for water, concentrated hydrochloric acid pulls
moisture of air towards itself. This moisture forms droplets of
water and hence the cloud.
(d) concentrated hydrochloric acid emits strongly smelling HCl gas all the
time.
7. The hybridization in ICl
7
 is
(a) sp
3
d
3
(b) d
2
sp
3
(c) sp
3
d
(d) sp
3
8. The compound of sulphur that can be used as refrigerant is
(a) SO
2
(b) SO
3
(c) S
2
Cl
2
(d) H
2
SO
4
9. Which of the following is a saline oxide ?
(a) Na
2
O
2
(b) BaO
2
(c) Na
2
O
(d) Fe
2
O
3
10. Which one of the following substances has the highest proton affinity ?
(a) H
2
S (b) NH
3
(c) PH
3
(d)  H
2
O
11. Which one of the following statement regarding helium is incorrect ?
(a) It is used to produce and sustain powerful superconducting magnets
(b) It is used as a cryogenic agent for carrying out experiments at low
temperatures
(c) It is used to fill gas balloons instead of hydrogen because it is lighter and
non-inflammable
(d) It is used in gas-cooled nuclear reactors
12. The acid which forms two series of salts is
(a) H
3
PO
4
(b) H
3
PO
3
(c) H
3
BO
3
(d)
13. Gaseous HCl is a poor conductor of  electricity while its aqueous
solution is a good conductor this is because
(a) is a good conductor of electricity
(b) a gas cannot conduct electricity but a liquid can
(c) HCl gas does not obey Ohm’s law, whereas the solution does
(d) HCl ionises in aqueous solution
14. The number of hydrogen atom(s) attached to phosphorus atom in
hypophosphorous acid is
(a) three
(b) one
(c) two
(d) zero
15. What products are expected from the disproportionation reaction of
hypochlorous acid?
(a) HCl and Cl
2
O
(b) HCl and HClO
3
(c) HClO
3
 and Cl
2
O
(d) HClO
2
 and HClO
4
16. Shape of  XeOF
4
 is
(a) octahedral
(b) square pyramidal
(c) pyramidal
(d) T-shaped
17. Yellow ammonium sulphide is
(a)
(b)
(c)
(d)
18. The correct order of increasing bond angles in the following species are
:
(a)
(b)
(c)
(d)
19. Which one of the following reactions of xenon compounds is not
feasible?
(a) 
(b)
(c)
(d)
20. Trigonal bipyramidal geometry is shown by :
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