F.sc.2.Chemistry.Ch.05 Solved Test (Malik Xufyan)

F.sc.2.Chemistry.Ch.05. Solved Test (Malik Xufyan)
Cell # 0313-7355727
Name: Class: 12 Portion inorganic
Paper: Chemistry Objective Part Marks: 17
Time: 20 Minutes. Test: 15 Chapter no: 5
Q 1. Each question has FOUR possible answers. Choose the correct answer and encircle it. 17
Sr#. Statement. A B C D
1. The color F2 is: Yellow Pale yellow Reddish
yellow
Greenish yellow
2. The oxidation state of F is: -1 +1 -2 +2
3. The color of HCl at room temperature is: Greenish
yellow
Violet Colorless Yellow
4. What type of bonding is present in HF? Ionic Covalent Dipole Hydrogen
5. The Cl2O7 is _____ liquid. Oily Concentrated Dilute All
6. The formula of bleaching powder is: CaOCl2 CaCO3 NaOH Ca(OH)2
7. Which is used to prepare chlorine? Caustic soda Baking soda Bleaching
powder
None of theses
8. Fluorine is used to prepare: Ferons Nylon Fibers PVA
9. The melting point of XeF4 is: 141◦C 146◦C 114◦C 104◦C
10. The mixture used for breathing by the sea
divers contain oxygen to about:
80% 20% 40% 50%
11. Which of the following HX is the weaker
acid in solution?
HF HI HCl HBr
12. Which is the strongest acid? HClO HClO2 HClO3 HClO4
13. Structure of OF2 is: Linear Planer Trigonal Bent
14. Halothane is used as? Antiseptic Antipyretic Anesthetic Anti-
inflammatory
15. The XeO3 is ____ . Weakly
acidic
Strongly
acidic
Basic Neutral
16. Electronegative of fluorine is: 3 2.5 4 2.58
17. Perchloric acid is ________ agent. Reducing Oxidizing Dehydrating Dehydrogenating

Cell # 0313-7355727
Name: Class: 12 Portion Inorganic
Paper: Chemistry Subjective Part Marks: 68
Time: 2:40 Test: 15 Chapter no: 5
SECTON –I
Q 2. Give the short answers of the any EIGHT
questions. 16
i. What is bleaching powder? How it is
prepared give names of different
methods.
ii. Discuss the oxides of chlorine.
iii. What are disportionation reactions? Give
an example.
iv. What is iodized salt?
v. What are ferons and Teflon?
vi. Why iodine has metallic lustre?
vii. Give the various uses of halogens and
their derivatives.
viii. Name the gas, which is used for earth
quack prediction.
ix. What are noble gases? Explain their
inertness on the basis of their electronic
configuration.
x. What do you know about oxyflourides of
xenon?
xi. Write down the names and formulas of
ores of halogens.
xii. Give some chemical properties of
Perchloric acid.
Q 3. Give the short answers of the any EIGHT
questions. 16
i. Give the applications of noble gases.
ii. Give the preparation of xenon
oxytetraflourides.
iii. Give the physical properties of noble
gases.
iv. What do you know about noble gases
write down?
v. What is meant by the available chlorine?
Give some uses of chlorine.
vi. Give general features of oxyacids of
halogens.
vii. What do you know about decolorization
of halogens?
viii. Discuss the preparation and properties of
iodine pentoxides.
ix. Write down about chlorine dioxides.
x. Give the preparation of bromine
monoxides.
xi. Give the uses of Beckmann’s method.
xii. Give the general features of oxyacids of
halogens.
Q 4. Give the short answers of the any SIX
questions.
12
i. What is meant by the bond dissociation
energy of halogens?
ii. What factors affecting the oxidizing
power of halogens?
iii. Give the trends in oxidizing power of
halogens.
iv. Give the properties of HF.
v. Give the preparation and properties of
oxides of fluorine.
vi. Give the physical properties of bleaching
powder and uses of bleaching powder.
vii. Give the construction of Beckmann’s
method.
viii. How bleaching powder acts as an
oxidizing agent?
SECTION-ll
Give the answers of the following THREE
questions. Each question is of FOUR marks.
24
Q 5.A) Give the similarities and dissimilarities of
fluorine to their groups.
B) Give the oxidizing properties of halogens.
Q 6.A) Discuss in detail of compounds of halogens.
B) Give the reaction of chlorine with cold and hot
NaOH.
Q 7.A) How bleaching powder is manufactured on
industrial scale?
B) Discuss in detail about compounds of xenon.

Cell # 0313-7355727
Name: Class: 12 Portion Inorganic
Paper: Chemistry Subjective Part Marks: 68
Time: 2:40 Test: 15 Chapter no: 5
SECTON –I
Q 2. Give the short answers of the any EIGHT questions.
16
xiii. What is bleaching powder? How it is prepared give names of different methods.
Chemical formula of bleaching powder is CaOCl2 or Ca( OCl )Cl. It can be prepared on
industrial scale. Different methods are used for the manufacturing of bleaching powder.
These methods are
1. Hasenclever’s method.
2. Beckmann’s method.
Hasenclever’s method is an old method while Beckmann’s method is a modern method.
xiv. Discuss the oxides of chlorine.
Oxides of chlorine are unstable. They are not prepared by the direct reaction of chlorine aand
oxygen. These are used extensively for bleaching wood, paper pulp in industry and for water
treatment. There are two oxides of chlorine. These are chlorine dioxide and chlorine
heptaoxide.ClO2 is prepared by the following reaction.
2ClO3ˉ + 2Clˉ + 4H⁺ 2ClO2 + Cl2 + 2H2O
Chlorine heptachloride is prepared by the following reaction.
2HClO4 + P2O5
-10 o
C
Cl2O7 + 2HPO3
ClO2 used as antiseptic. It is used for purification of water. it is also used to bleach cellulose
material.
xv. What are disproportion reactions? Give an example.
A reaction in which specie (atom, ion or molecule) is oxidized and reduced simultaneously is
called disproportion reaction. For example:
Reaction of Cl2 with cold and hot NaOH is an example of disproportion reaction.
xvi. What is iodized salt?
When some amount of iodide ions are added in common salt (NaCl) , this is called iodized
salt. Usually, for this purpose NaI or KI is mixed with NaCl. Insufficient amount of iodine
causes the enlargement of thyroid glands.
xvii. What are ferons and Teflon?
Flourochlorocarbons are called ferons. These are CCl2F2 (diflourodichloromethane) & CClF3
(tifluorochloromethane). These gases are used as refrigerant and aerosol poll ants. Teflon is a
polymer of ( [ CF2-CF2 ]n ). It is an important plastic.
xviii. Why iodine has metallic lustre?
Metallic luster in iodine is due to the excitation of electrons of iodine at room temperature.
Due to the bigger size of iodine the electrons of iodine at room temperature take energy and
go to higher energy states. When excited electrons come back, they emit some radiations of
particular wavelength. Therefore, they appear as luster grayish black solid.

Cell # 0313-7355727
xix. Give the various uses of halogens and their derivatives.
Uses of halogens or their derivatives are
 Fluorine is used in the preparation of ferons and Teflon.
 Fluorides in toothpastes build a protective coating on teeth.
 Chlorine is used in the manufacturing of bleaching powder, PVC, CHCl3 and CCl4.
 Bromine is used as fungicide and as AgBr in photography.
 Iodine is used in pharmaceutical company. It is added as NaI or KI as a table salt.
xx. Name the gas, which is used for earthquake prediction.
Radon is used for earthquake prediction.
xxi. What are noble gases? Explain their inertness on the basis of their electronic
configuration.
Elements Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Ra)
that are placed in zero group or VIII group or periodic table are called noble gases. These are
also called inert gases or rare gases because they are chemically inert and present in very
small amount in atmosphere. All noble gases have their complete octet. Therefore, they are
chemically inert.
xxii. What do you know about oxyflourides of xenon?
Oxytetraflourides are colorless volatile liquid. It can be kept in nickel vessel. it reacts with
water to give XeO3. Xenon oxytetraflourides are prepared rapidly by the rapid reaction of
XeF6 with silica.
2XeF6 + SiO2 2XeF4 + SiF4
xxiii. Write down the names and formulas of ores of halogens.
Ores of fluorine are Fluorspar (CaF), Cryolite (Na3AlF6) and Apatite [(CaF2.3Ca3(PO4)2].
Ores of chlorine are Halite (NaCl), Carnallite (KCl.MgCl2.6H2O) (salt beds, brine wells, sea
water).
Ores of bromine are Brine wells, sea water, NaBr, KBr and MgBr2.
Ores of iodine are NaIO3, NaIO4 deposits in Chile brine walls.
xxiv. Give some chemical properties of Perchloric acid.
 It reacts with organic compounds violently.
 Dissolving power of HClO4 is enhanced due to increase in oxidizing strength.
 Cold and dilute Perchloric acid is a very weak oxidizing agent.
 It is the strongest of all acids in aqueous medium.
Q 3. Give the short answers of the any EIGHT questions.
16
xiii. Give the applications of noble gases.
Application of noble gases is
 He is used in weather balloons, in welding and in traffic signal lights.
 Ne and He arc is used in making glass lasers.
 Xe is used in bactericidal lamps.
 Radon being radioactive is used in radiotherapy for cancer and for earth quack prediction.

Cell # 0313-7355727
 Krypton is used to fill fluorescent tubes and in flash lamps for high speed.
xiv. Give the preparation of xenon oxytetraflourides.
1. Xenon oxytetraflourides are prepared rapidly by the rapid reaction of XeF6 with silica.
2XeF6 + SiO2 2XeF4 + SiF4
2. Hydrolysis of XeF6 with small amount of water gives XeOF4.
XeF6 + H2O XeOF4 + 2HF
xv. Give the physical properties of noble gases.
All noble gases are colorless and odourless gases. They are chemically inert. Due to complete
shell it is difficult to remove electrons from valance shell. Therefore, they have high
ionization energy. They have low melting and boiling point and heat of vaporization. They
are less soluble in water. Their solubility increases down the group due to increase in atomic
size.
xvi. What do you know about noble gases write down?
Elements Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Ra)
that are placed in zero group or VIII group or periodic table are called noble gases. These are
also called inert gases or rare gases because they are chemically inert and present in very
small amount in atmosphere. All noble gases have their complete octet. Therefore, they are
chemically inert.
All noble gases are colorless and odourless gases. They are chemically inert. Due to
complete shell it is difficult to remove electrons from valance shell. Therefore, they have high
ionization energy. They have low melting and boiling point and heat of vaporization. They are
less soluble in water. Their solubility increases down the group due to increase in atomic size.
xvii. What is meant by the available chlorine? Give some uses of chlorine.
The amount of chlorine which is set free during the reaction of bleaching powder with an
acid is called available chlorine. Chlorine is used in:
 Chlorine is used in the manufacturing of bleaching powder.
 It is also used in the manufacturing of HCl, which is cheapest industrial acid. It is
used in the manufacturing of antiseptics and insecticides, weed killer.
 It is used in the manufacturing of PVC plastics.
 It is used as disinfectant in swimming pool and water treatment plants.
xviii. Give general features of oxyacids of halogens.
General features of oxyacids of halogens are
 Stable oxyacids of fluorine do not exist. HOF has been prepared but is highly
unstable.
 Most of oxyacids of halogens are unstable compound. They generally exist only in
aqueous solution in the form of their salts. They cannot be isolated.
xix. What do you know about decolorization of halogens?
F2 and Cl2 can oxidize colored dyes to colorless substances e.g. litmus, universal indicators
etc. during bleaching Cl also act as oxidizing agent.
xx. Discuss the preparation and properties of iodine pentoxides.

Cell # 0313-7355727
Iodine penta oxide is prepared by heating acidic acid at 240˚C.
2HIO3
240 o
C
I2O5 + H2O
 Iodine penta oxide is a white crystalline solid.
 It is stable up to 300˚C.
 It has polymeric structure.
 It is insoluble in organic solvents.
xxi. Write down about chlorine dioxides.
Chlorine dioxide is a pale yellow gas. On warming, it explodes into Cl2 and O2. It is soluble
in water. it is stable in dark. It is used as antiseptic and for the purification of water. it is
prepared by the following reaction.
2ClO3ˉ + 2Clˉ + 4H⁺ 2ClO2 + Cl2 + 2H2O
xxii. Give the preparation of bromine monoxides.
It can be prepared by reaction of bromine vapours with mercuric oxide.
HgO + 2Br2
50 o
C
HgBr2 + Br2O
It is also prepared by the treating suspension of HgO in CCl4 with bromine.
HgO + 2Br2 HgBr2 + Br2O
xxiii. Give the uses of Beckmann’s method.
1. This method is used in the manufacturing of chloroform.
2. This method is used for bleaching cotton, linen and paper pulp
3. This method is used for making unshrinkable wool.
4. This method is used for the laboratory preparation of chlorine and oxygen.
xxiv. Give the general features of oxyacids of halogens.
1. Stable oxyacids of fluorine do not exist. HOF has been prepared but is highly
unstable.
2. Most of the oxyacids of halogens are unstable compound. They generally exist only
in aqueous solution in the form of their salts. They cannot be isolated.
Q 4. Give the short answers of the any SIX questions.
12
ix. What is meant by the bond dissociation energy of halogens?
Bond dissociation energy of halogens decreases with increase in size of halogen atoms.
Dissociation occurs in the following order.
HF < HCl < HBr < HI
Thus HI is dissociated more and HF is dissociated least.
x. What factors affecting the oxidizing power of halogens?
Following factors affect oxidizing power.
 Energy of dissociation.
 Electron affinities of atoms
 Hydration energy of ions.

Cell # 0313-7355727
 Heats of vaporization.
xi. Give the trends in oxidizing power of halogens.
If a halogen has low energy of dissociation, high electron affinity and high hydration energy
of its ions, then it will be a better oxidizing agent. Thus oxidizing power of F2 is high due to
low dissociation energy and high hydration energy of Fˉ ion.
Thus general trend of oxidizing power is
F2 > Cl2 > Br2 > I2
xii. Give the properties of HF.
Properties of HF are
 HF is a colorless volatile liquid. HF attacks glass. It is handled in teflon (poly tetra
flour ethylene) containers. In dry state, it can be stored in copper stainless-steel
containers under vacuum.
 It is strongly fuming liquid.
 It is used as non-aqueous solvent.
 HF is a strongly hydrogen bonded liquid.
xiii. Give the preparation and properties of oxides of fluorine.
Trioxygen di fluoride (O3F2) is prepared by passing electric discharge through a mixture of
oxygen and fluorine. 2F2 + 3O2 2O3F2
Properties of oxides of fluorine are
 At 363˚C, it is dark red viscous liquid but turns to reddish brown solid at 350˚C.
 It decomposes on heating to give oxygen gas and other oxides of fluorine.
2O3F2 2O2F2 + O2
xiv. Give the physical properties of bleaching powder and uses of bleaching powder.
It is yellowish white powder. It has strong smell of chlorine. It is used for the preparation of
chlorine and oxygen. It is used in the manufacturing of chloroform. It is used as disinfectant
and in the sterilization of water. it is used for making unshrinkable wool.
xv. Give the construction of Beckmann’s method.
The apparatus of Beckmann’s method consists of;
 Cast iron tower.
 This tower has eight horizontal shelves.
 Each shelve has a rotating rake.
 There is a hopper is present at the top.
 Bleaching powder is collected at the bottom of the tower.
 There are inlets for Cl2 and hot air, at the base of tower.
xvi. How bleaching powder acts as an oxidizing agent?
Bleaching powder acts as an oxidizing agent due to the generation of hypochlorite ion (OCl-
)
in water.
Ca(OCl)Cl
H2O
Ca2+
+ Cl-
+ ClO-
SECTION-ll

Cell # 0313-7355727
Give the answers of the following THREE questions. Each question is of FOUR marks.
24
Q 5.A) Give the similarities and dissimilarities of fluorine to their groups.
See the topic of peculiar behavior of fluorine.
B) Give the oxidizing properties of halogens.
See the topic of oxidizing properties.
Q 6.A) Discuss in detail of compounds of halogens
See the topic of compounds of halogens.
B) Give the reaction of chlorine with cold and hot NaOH.
See the topic of reactions of chlorine with cold and hot NaOH.
Q 7.A) How bleaching powder is manufactured on industrial scale?
See the topic of manufacturing of bleaching powder.
B) Discuss in detail about compounds of xenon.
See the topic of compounds of xenon.

Cell # 0313-7355727
Exercise
Q 7. (a) How the halogen acids are ionized in water.
Halogen acids are ionized in water to give H+
ions.
HX + H2O H3O+
+ OH-
The order of acid strength is given below.
HF > HCl > HBr > HI
Q 13. Give the short answers of the following.
(i) What is “Iodized salt”?
When some amount of iodide ions added in common salt (NaCl), this is called iodized salt.
Usually, for this purpose NaI or KI is mixed with NaCl. Insufficient amount of iodine causes
the enlargement of thyroid glands.
(ii) What are Ferons and Teflon?
Flourochlorocarbons are called ferons. These are CCl2F2 (diflourodichloromethane) & CClF3
(tifluorochloromethane). These gases are used as refrigerant and aerosol poll ants. Teflon is a
polymer of ( [ CF2-CF2 ]n ). It is an important plastic.
(iii) Arrange the following ions in order of increasing size.
F-
, Cl-
, I-
, Br-
I-
> Br-
> Cl-
> F-
Ionic radii increase downward from top to bottom in a group. F-
Has smallest size while I-
has greater size.
(iv) Why iodine has metallic lustre?
Metallic luster in iodine is due to the excitation of electrons of iodine at room temperature.
Due to the bigger size of iodine the electrons of iodine at room temperature take energy and
go to higher energy states. When excited electrons come back, they emit some radiations of
particular wavelength. Therefore, they appear as luster grayish black solid.
(v) Which halogen sublimes to violets vapours?
Iodine is grayish black solid and emits vapours of violet color.
(vi) Which halogen is used as an antiseptic?
Iodine is used as antiseptic in the form of iodine tincture and iodex.
(vii) Which halogen is used in water treatment to kill bacteria?
Chlorine is disinfectant and used to kill pathogenic bacteria. It is used in drinking water and
swimming pools as disinfectant.
(viii) Name the gas, which is used for earth quack prediction.
Radon is used for earth quack prediction.
(ix) Name the gas, which is used in bacterial lamps.
Xenon is used in bacterial lamps.

F.sc.2.Chemistry.Ch.05 Solved Test (Malik Xufyan)

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