Question # 1

White Phosphorus is kept under

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Cold water

Ammonia liquor

Ethanol

Kerosene

Relative order of acidity of oxy acid

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HCIO > HCIO2 > HCIO3 > HCIO4

HCIO4 > HCIO3 >HCIO2 > HCIO

HCIO3 > HCIO2 > HCIO > HCIO4

HCIO2 > HCIO4 > HCIO3 > HCIO

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

In the Lewis structure of H2SO4 molecule the total number of unshared electrons in valence shell of various atoms is.

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8

16

12

20

Gases and dust particles are removed from H2SO4 by

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Tydal effect

Drying tower

Absorption tower

Contact converter

Cryolite is used in the electrolytic extraction of aluminium to.

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Obtain more aluminium

Reduce alumina

Protective electrodes

Dissolve bauxite and increase the electrical conductivity

Example of peseudohalonge group.

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Cyanogen

Thiocyanogen

Selenocyanogen

All above

Aluminum occurs in nature as.

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Native

Combined form

Both native and combined

Free

Which of the following has the highest melting point.

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NaCl

KCl

MgO

BaO

The compound insoluble in acetic acid is.

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Calcium oxide

Calcium carbonate

Calcium oxalate

Calcium hydroxide

The compound which does not act as Lewis acid is.

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BF3

AlCl3

BeCl2

SnCl4

Noble gases are used in discharge tubes to give different colours. Raddish orange glow is due to.

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Ar

Ne

Xe

Kr

The attraction which exists between carbon dioxide molecules in solid carbon dioxide is due to.

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Van der Waal's forces

Molecule ion forces

ionic bonds

hydrogen bonds

Anything that influence the valence electrons will affect the chemistry of the element Which of the following factors does not affect the valency shell.

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Valence principle quantum number in

Nuclear charge (Z)

Nuclear mass

Number of core electrons

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

The configuration of valence shell of certain atom X is 3s2 , 3p5, which valences can it exhibit.

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1,3 only

1,5 only

1,3,5,7

1,3,4

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

The formula of Tetraboric acid is.

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H2BO3

HBO2

H2B4O7

H6B4O9

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

The Lewis structure of which of the following does not have coordinate bond.

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SO2

HNO3

H2SO4

HNO2

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

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