Question # 1

Which is the strongest acid?

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HClO

HClO₂

HClO₃

HClO₄

Which has the least oxidizing power?

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F₂

Cl₂

Br₂

I₂

The strongest hydrogen bond is in

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HF

HCl

HBr

Hl

Which of the following represents the correct electronic configuration of the outermost energy level of an element of zero (VIIA) group in the ground state?

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s²p²

s²p⁴

s²p⁵

s²p⁶

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

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He

Ne

Ar

Kr

Molecule of halogens exist as

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Monatomic

Diatomic

Triatomi

Polyatomic

Which has complete valence shell?

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C

N

O

Ne

Chlorin heptoxide reacts with water to form:

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

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

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HF

HBr

HI

HCl

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

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Cl₂

NH₃

CO₂

He

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

Gaseous HF exists in the form of

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Monomers

Cyclic hexamers

As single entity

Both a and b

Colour of chlorine is

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Pale yellow

Greenish yellow

Red brown

Greyish black

Smell of halogen is

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Fruity

Sweet

Irritating

Rotten egg

the anhydride of HCIO₄is

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CIO₃

ClO₂

Cl₂O₅

Cl₂O₇

Noble gases in the atmosphere are

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4%

3%

2%

1%

Gaseous HF exists in the form of

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Monomers

Cyclic hexames

As single entity

Both (a) and (b)

Halogens are called

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Salt former

Light bearing

Copper forming

none of these

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

Radioactive element in halogens is

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Astatine

bromine

Iodine

Fluorine

The only non-metal in liquid form is

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S

Cl

Br

P

Hydrogen bond is the strongest between the molecules of

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HF

HCl

HBr

HI

Smell of halogens is:

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Fruity

Sweet

Irritating

Rotten egg

Non sticking coating in cooking utensils is done by

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Iron

Cooper

Plastic

Teflon

Chlorine heptoxide (Cl2O7) reacts with water to form

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Hypochlorous acid

chloric acid

Perchloric acid

Chlorine and Oxygen

Second most element in the universe is

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He

Ne

Ar

Kr

Which is used as cooling medium in nuclear reactors?

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He

Ne

Ar

Kr

Bleaching powder is prepared by the reaction of Cl₂with.

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Lime stone

Lime water

slaked lime

Lime

The strongest acid is

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HF

HCl

HBr

HI

Half life period of astatine is

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8.1 hrs

8.2 Hrs

8.3 hrs

8.4 hrs

Hydrogen bond is the strongest between the molecules of:

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HF

HCl

HBr

Hl

Astatine belongs to group

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I-A

II-A

III-A

VII-A

Bleaching powder is agent:

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Dehydrating

Oxidazing

reducing

all

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

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ECAT Chemistry Chapter 16 The Halogens and The Noble Gases Online Test MCQs With Answers

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