12th Class Chemistry Chapter 5 (The Helogens and Noble Gasses) Online Preparation

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Chemistry - 12th Class Chemistry Chapter 5 Short Questions Preparation

Question # 1

On what factor oxidizing power of halogens depends upon?

Ans 1:
1. Energy of dissociation
2. Electrons affinity of atoms
3. Heat of vapourization

Question # 2

How bleaching powder is prepared by Hasenclever method?

Ans 1: The apparatus used in this method consists of 4 to 8 iron cylinders placed one above the other horizontal ,They are interconnected and provided with stirrers,The slaked lime is added in through a hopper in the upper cylinder and transported from one cylinder rises p and reacts with slacked lime form bleaching powder ,which is collected through the outlet in the lower cylinder.

Question # 3

Halogens are strong oxidizing agents ,Justify.

Ans 1: All the free halogens acts as oxidizing agents when they reacts with metals or nonmetals.On forming ionic compounds with metals,the halogen s gain electron and are converted to negative halide ions.

Question # 4

Why HF is weaker acid that other halogen acid?

Ans 1: In water hydrogen halides give hydrofluoric ,hydrochloric ,hydrobromic and hydroiodic acid,The strength hydrogen halogen bond is very high in HF.The bond strength is reflected in the case of dissociation of hydrogen and halides,Hydrofluoric acid is week acid due to limited ionization,The other three acid are very strong acids,The acidic strength increase in order.

Question # 5

Give one method of preparation and one use of I₂O₅?

Ans 1: Preparation : It can be prepared by heating iodic acid at 240^oDegree,
it is used for the quantitative analysis of CO.

Question # 6

Why oxidizing power of halogens decreases down the group?

Ans 1: Oxidizing power of halogens depends upon the following factors:
1. Energy of dissociation
2. Electron affinity of atoms
3. Hydration energy if ions
4. Heat of vapourization
While going down the group all above mentioned factors decreases, All the free halogens acts as oxidizing agents when they reacts with metals or non metals,On forming ionic compound with metals ,the hydrogens as gain of electrons and are converted to negative halide ions.

Question # 7

Write two uses of halogen?

Ans 1:
1. Fluorine is used for the preparation of freons,which is being used in refrigerator and aerosol propellants.
2. Chlorine is used in the manufacturing of bleaching powder.

Question # 8

What is meant by available chlorine?

Ans 1: If excess of an acid is added to bleaching powder ,chlorine is given out.
The amount of chlorine thus set free is called available chlorine,The activity of bleaching powder is measured in terms of available chlorine,The average percentage of available chlorine in bleaching powder is 35-40%.

Question # 9

Give reason that fluorine is gas ,iodine is solid?

Ans 1: Iodine molecule has larger size than fluorine,The intermolecular attraction is greater in the larger molecule having greater masses.Due to the larger size of iodine molecule the van der Waal forces are stronger than smaller size molecule of fluorine.

Question # 10

Arrange the following oxyacids in increasing order of acid strength and oxidizing power ; HCIO₄>HCIO₂>HCIO

Ans 1: HCIO₄>HCIO₂>HCIO

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Prepare Complete Set Wise Questions For Chapter 5 "12th Class Chemistry Chapter 5 Short Questions Preparation "

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Set 2

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Set 3

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12th Class Chemistry Chapter 5 Short Questions Preparation - Set 1

Question # 1

On what factor oxidizing power of halogens depends upon?

Ans 1:
1. Energy of dissociation
2. Electrons affinity of atoms
3. Heat of vapourization

Question # 2

How bleaching powder is prepared by Hasenclever method?

Ans 1: The apparatus used in this method consists of 4 to 8 iron cylinders placed one above the other horizontal ,They are interconnected and provided with stirrers,The slaked lime is added in through a hopper in the upper cylinder and transported from one cylinder rises p and reacts with slacked lime form bleaching powder ,which is collected through the outlet in the lower cylinder.

Question # 3

Halogens are strong oxidizing agents ,Justify.

Ans 1: All the free halogens acts as oxidizing agents when they reacts with metals or nonmetals.On forming ionic compounds with metals,the halogen s gain electron and are converted to negative halide ions.

Question # 4

Why HF is weaker acid that other halogen acid?

Ans 1: In water hydrogen halides give hydrofluoric ,hydrochloric ,hydrobromic and hydroiodic acid,The strength hydrogen halogen bond is very high in HF.The bond strength is reflected in the case of dissociation of hydrogen and halides,Hydrofluoric acid is week acid due to limited ionization,The other three acid are very strong acids,The acidic strength increase in order.

Question # 5

Give one method of preparation and one use of I₂O₅?

Ans 1: Preparation : It can be prepared by heating iodic acid at 240^oDegree,
it is used for the quantitative analysis of CO.

Question # 6

Why oxidizing power of halogens decreases down the group?

Ans 1: Oxidizing power of halogens depends upon the following factors:
1. Energy of dissociation
2. Electron affinity of atoms
3. Hydration energy if ions
4. Heat of vapourization
While going down the group all above mentioned factors decreases, All the free halogens acts as oxidizing agents when they reacts with metals or non metals,On forming ionic compound with metals ,the hydrogens as gain of electrons and are converted to negative halide ions.

Question # 7

Write two uses of halogen?

Ans 1:
1. Fluorine is used for the preparation of freons,which is being used in refrigerator and aerosol propellants.
2. Chlorine is used in the manufacturing of bleaching powder.

Question # 8

What is meant by available chlorine?

Ans 1: If excess of an acid is added to bleaching powder ,chlorine is given out.
The amount of chlorine thus set free is called available chlorine,The activity of bleaching powder is measured in terms of available chlorine,The average percentage of available chlorine in bleaching powder is 35-40%.

Question # 9

Give reason that fluorine is gas ,iodine is solid?

Ans 1: Iodine molecule has larger size than fluorine,The intermolecular attraction is greater in the larger molecule having greater masses.Due to the larger size of iodine molecule the van der Waal forces are stronger than smaller size molecule of fluorine.

Question # 10

Arrange the following oxyacids in increasing order of acid strength and oxidizing power ; HCIO₄>HCIO₂>HCIO

Ans 1: HCIO₄>HCIO₂>HCIO

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12th Class Chemistry Chapter 5 Short Questions Preparation - Set 2

Question # 1

Write two use of bleaching powder?

Ans 1: Bleaching powder is used :
1. for the laboratory preparation of chlorine and oxygen.
2. for making unshrinkable wool.

Question # 2

Give one method of preparation and one use of I₂O₅?

Ans 1: Preparation : It can be prepared by heating iodic acid at 240^oDegree,
it is used for the quantitative analysis of CO.

Question # 3

Give two application of Radon gas.

Ans 1: 1.Radon is being radioactive is used in earthquake prediction.
2.Radon being radioactive is used in radiotherapy for cancer.

Question # 4

How halogen acids are ionized in water?

Ans 1: In water hydrogen halides give hydroflorine ,hydrochloric,hydrobromic and hydrochloric acids.Hydrofluoric acid is week acid due to limited ionization,The other three acids are vert strong acid,The acidic strength increases in the order.

Question # 5

Halogens are strong oxidizing agents ,Justify.

Ans 1: All the free halogens acts as oxidizing agents when they reacts with metals or nonmetals.On forming ionic compounds with metals,the halogen s gain electron and are converted to negative halide ions.

Question # 6

What is meant by available chlorine?

Ans 1: If excess of an acid is added to bleaching powder ,chlorine is given out.
The amount of chlorine thus set free is called available chlorine,The activity of bleaching powder is measured in terms of available chlorine,The average percentage of available chlorine in bleaching powder is 35-40%.

Question # 7

Define "disproportion reaction".

Ans 1: A reaction in which a species(molecule atom or ion )is simultaneously oxidized and reduced is called disproportion reaction.

Question # 8

Describe factor of acidic strength of oxyacids of halogens?

Ans 1:
1. Number of oxygen atoms attached to the oxyacid halogens.
2. oxidation state of hydrogen in oxyacid of halogens.
3. Tendency to lose proton from oxyacid of halogens.

Question # 9

What are the commercial use of halogens and their compounds?

Ans 1:
1. Fluorine is used for the preparation of ferons,Which is being used in refrigerants and aerosol propellants.
2. Fluorine is used to prepare Teflon.
3. Iodine is used in pharmaceutical industries as disinfectants and germicides.

Question # 10

What are noble gasses?Why are they inert?

Ans 1: Elements of group VIII-A are called noble gases because these elements are colourless odourless monatomic gases which are chemically unreactive.
Noble gases are inert due to the completion of their outermost shell. These gases have complete electronic configuration and have filled duplet and octet.

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12th Class Chemistry Chapter 5 Short Questions Preparation - Set 3

Question # 1

Why Fluorine acts as a strong oxidation agent?

Ans 1: Oxidizing power of fluorine is higher,because it has low energy of dissociation and higher hydration energy of its ions,Due to the relative strength as oxidizing agents,it is possible for each free halogen to oxidize the ions of other halogens next to it in the family .Fluorine can oxidize all the halide ions molecule halogens.

Question # 2

Give reason that fluorine is gas ,iodine is solid?

Ans 1: Iodine molecule has larger size than fluorine,The intermolecular attraction is greater in the larger molecule having greater masses.Due to the larger size of iodine molecule the van der Waal forces are stronger than smaller size molecule of fluorine.

Question # 3

What is bleaching powder?

Ans 1: Bleaching powder is yellowish white powder with strong smell of chlorine and is used to bleach different things.It has chlorine known as "available chlorine".

Question # 4

On what factor oxidizing power of halogens depends upon?

Ans 1:
1. Energy of dissociation
2. Electrons affinity of atoms
3. Heat of vapourization

Question # 5

What is peculiar behaviour of Fluorine?

Ans 1: The halogen form a homologous series but fluorine differ from the other halogens in many respects which is due to :
1. Small in size of D atom and F ion,
2. High first ionization energy and electronegativity.
3. Low dissociation energy of F₂molecule as compared to CI₂and Br₂.
4. Restriction of the valence shell to an octet
5. Direst combination with inert gasses.

Question # 6

What is iodize salt?

Ans 1: When sodium or potassium iodine is added to the common salt,then the common salt is called iodized salt.

Question # 7

Write two uses of halogen?

Ans 1:
1. Fluorine is used for the preparation of freons,which is being used in refrigerator and aerosol propellants.
2. Chlorine is used in the manufacturing of bleaching powder.

Question # 8

The elements of group VIII-A are called noble gases.Comment?

Ans 1: Elements of group VIII-A are called noble gases because,these elements are colourless,odourless monoatomic gases which are chemically un-reactive.

Question # 9

What is meant by available chlorine?

Ans 1: If excess of an acid is added to bleaching powder ,chlorine is given out.
The amount of chlorine thus set free is called available chlorine,The activity of bleaching powder is measured in terms of available chlorine,The average percentage of available chlorine in bleaching powder is 35-40%.

Question # 10

Why the lattice energy of Fluorides is greater than Chlorides?

Ans 1: Due to small size of fluoride ions(f),there will be a better overlap of orbitals and consequently leads to shorter and stronger bonds with other elements.Ionic fluorides have higher lattice energies than the chlorides and the value is responsible for the insolubility of the fluorides in water.Due to low dissociation energy of fluorine molecule,it is highly reactive.The other halogens react slowly under similar conditions.The fluorides are,however more stable with respect to dissociation into elements.

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12th Class Chemistry Chapter 5 Preparation

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2nd Year Chemistry Chapter 5 (The Helogens and Noble Gasses) Online Preparation

Online Short Questions For Chapter 5 "12th Class Chemistry Chapter 5 Short Questions Preparation "

Chemistry - 12th Class Chemistry Chapter 5 Short Questions Preparation

On what factor oxidizing power of halogens depends upon?

How bleaching powder is prepared by Hasenclever method?

Halogens are strong oxidizing agents ,Justify.

Why HF is weaker acid that other halogen acid?

Give one method of preparation and one use of I2O5?

Why oxidizing power of halogens decreases down the group?

Write two uses of halogen?

What is meant by available chlorine?

Give reason that fluorine is gas ,iodine is solid?

Arrange the following oxyacids in increasing order of acid strength and oxidizing power ; HCIO4>HCIO2>HCIO

Prepare Complete Set Wise Questions For Chapter 5 "12th Class Chemistry Chapter 5 Short Questions Preparation "

Set 1

Set 2

Set 3

12th Class Chemistry Chapter 5 Short Questions Preparation - Set 1

On what factor oxidizing power of halogens depends upon?

How bleaching powder is prepared by Hasenclever method?

Halogens are strong oxidizing agents ,Justify.

Why HF is weaker acid that other halogen acid?

Give one method of preparation and one use of I2O5?

Why oxidizing power of halogens decreases down the group?

Write two uses of halogen?

What is meant by available chlorine?

Give reason that fluorine is gas ,iodine is solid?

Arrange the following oxyacids in increasing order of acid strength and oxidizing power ; HCIO4>HCIO2>HCIO

12th Class Chemistry Chapter 5 Short Questions Preparation - Set 2

Write two use of bleaching powder?

Give one method of preparation and one use of I2O5?

Give two application of Radon gas.

How halogen acids are ionized in water?

Halogens are strong oxidizing agents ,Justify.

What is meant by available chlorine?

Define "disproportion reaction".

Describe factor of acidic strength of oxyacids of halogens?

What are the commercial use of halogens and their compounds?

What are noble gasses?Why are they inert?

12th Class Chemistry Chapter 5 Short Questions Preparation - Set 3

Why Fluorine acts as a strong oxidation agent?

Give reason that fluorine is gas ,iodine is solid?

What is bleaching powder?

On what factor oxidizing power of halogens depends upon?

What is peculiar behaviour of Fluorine?

What is iodize salt?

Write two uses of halogen?

The elements of group VIII-A are called noble gases.Comment?

What is meant by available chlorine?

Why the lattice energy of Fluorides is greater than Chlorides?

12th Class Chemistry Chapter 5 Preparation

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Give one method of preparation and one use of I₂O₅?

Arrange the following oxyacids in increasing order of acid strength and oxidizing power ; HCIO₄>HCIO₂>HCIO

Give one method of preparation and one use of I₂O₅?

Arrange the following oxyacids in increasing order of acid strength and oxidizing power ; HCIO₄>HCIO₂>HCIO

Give one method of preparation and one use of I₂O₅?