Question # 1

The available chlorine is bleaching power is

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25-30%

30-35%

35-40%

40-45%

Halogens are called

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Salt former

Light bearing

Copper forming

none of these

Which has the least oxidizing power?

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F₂

Cl₂

Br₂

I₂

Which is the strongest acid?

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HClO

HClO₂

HClO₃

HClO₄

The most reactive elements are:

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Group IV-A

Group V-A

Group VI-A

Group VII -A

Gaseous HF exists in the form of

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Monomers

Cyclic hexamers

As single entity

Both a and b

Half life period of astatine is

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8.1 hrs

8.2 Hrs

8.3 hrs

8.4 hrs

Colour of Iodine is

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Pale yellow

Greenish yellow

Red brown

Greyish black

Astatine belongs to group:

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I-A

II-A

III-A

VII-A

Which halogen will react spontaneously with Au(s)to produce Au3++

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Br2

F2

I2

Cl2

Which noble gas is used in mixture used for breathing by divers?

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Cl₂

NH₃

CO₂

He

Which compound of noble gas xenon can be prepared?

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Oxides

Fluoride

Oxyfluorides

All of these

The compound with cyclic hexamer is

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HF

HCl

HBr

HI

Non sticking coating in cooking utensils is done by

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Iron

Cooper

Plastic

Teflon

Noble gases are placed in group

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Group IV-A

Group V-A

Group VI-A

Group VII-A

Oxidation state of fluorine is:

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+1

+2

-1

-2

An element that has a high ionization energy and tends to be chemically inactive would most likely to be

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an alkali metal

a transition element

a noble gas

a halogen

Astatine belongs to group

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I-A

II-A

III-A

VII-A

Which of the following hydrogen halide is the weakest acid in solution?

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HF

HBr

Hl

HCl

Second most element in the universe is

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He

Ne

Ar

Kr

Which is present as a result of radioactive decay on earth?

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He

Ne

Ar

Kr

The only non-metal in liquid form is

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S

Cl

Br

P

Which halogen occurs naturally in a positive oxidation state?

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Fluorine

Chlorine

Bromine

Iodine

Which is used in bacterial lamps

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He

Ne

Ar

Kr

Chlorin heptoxide reacts with water to form:

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

I₂O₅is used for quantitative study of

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CO₂

NO₂

NO

CO

The strongest acid is

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HF

HCl

HBr

HI

Which is used as cooling medium in nuclear reactors?

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He

Ne

Ar

Kr

Nobel gases are placed group:

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Group IV-A

Group V-A

Group VI-A

Group VII-A

Half life of most stable isotope of astatine is

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8.0 hrs

8.1 hrs

8.2 hrs

8.3 hrs

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