Question # 1

Which is the second most abundant element in the universe

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H

He

CO

C

Which statement is correct about the given reaction.

2NaOH + Cl2 --------------- NaCl + NaCIO + H2O

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Cl is oxidized and O is reduced

Cl is reduced and O is oxidized

Cl is oxidized as well as reduced

Neither Cl nor oxygen is reduced or oxidized

Which halogen occurs naturally in a positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

Hydrogen bond is the strongest between the molecules of

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HF

HCl

HBr

HI

Which is the strongest acid

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HCIO

HCIO₂

HCIO₃

HCIO₄

Which one of the following noble gases is least polarizable

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He

Ne

Ar

Kr

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

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Br₂

F₂

I₂

Cl₂

Which element form maximum compounds with Xenon

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F

Cl

Br

I

The chemical formula of Sodium Bromite is.

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NaBrO

NaBrO2

NaBrO3

NaBrO4

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

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HF

HBr

HI

HCl

Colour of which halogen is not correctly related.

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F2 --- colourless gas

Cl2---- greenish yellow gas

Br2----- Reddish brown liquid

I2-------- grayish Black solid

Hydrogen bond is the strongest between the molecules of.

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HF

HCl

HBr

HI

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

Iodine deficiency in diet is known to cause.

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Beri Beri

Goiter

Rickets

Night blindness

Chlorine heptoxide reacts with water to form

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

Bleaching powder may be produced by passing chlorine over

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calcium carbonate

hydrated calcium sulphate

calcium hydroxide

magnesium hydroxide

Which noble gas is used in radiotherapy

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Neon

Argon

Krypta

Radon

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