Question # 1

Used in producing intense light in cinematography

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Xenon

Krypton

Radon

Helium

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

Highly dangerous acid and produces severe wounds on the skin.

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HCIO

HCIO2

HCIO3

HCIO4

Which of the following statement is not true regarding Open Hearth process.

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No iron is lost

The process is economical and simple

Steel obtained is of high quality

Scrap iron cannot be used in this process.

The pair of molecules or ions having identical geometry is.

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BCl3, PCl3

BF3, NH3

CHCl3, CCl4

SiCl4, CCl4

An equal volume mixture explodes with violence

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H2 & N2O

H2 & NO

H2 & N2O4

H2 & N2O3

Atomicity of which of the following pair of elements is not same as hydrogen.

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Phosphorus, Nitrogen

Nitrogen, Argon

Nitrogen, iodine

Iodine, sulphur

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

The penultimate shell of carbon contains electrons.

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s2

s2p6

s2p6d10

s2p6d8

Alums are generally used

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In Dying and water proofing of fabric

In arrest bleeding

IN water purification

All above

Which of the following is not a property of Cr.

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it is brilliant silvery metal

it is malleable

It can take very high polish

Its surface is tarnished easily

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

Types of carides

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Ionic carides

Covalent carbides

Interstitial carbides

All above

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

What is the oxidation number of the central meal atom in the coordination compound.[Pt(NH#)#Cl]Cl

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-1

0

+2

+3

In manufacturing of cement crystallization of amorphous dehydration products of clay

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500 ^oC to 800 ^oC

900 ^oC to 1200^oC

1250 ^oC ti 1400 ^oC

1000 to 1100 ^oC

Form electron deficient compounds

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B

AI

Both B and AI

None of above

The solution of NaOH pH -10.46 contain [OH-]

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2.0 X. 10^-4

4.6 X 10^-4

4.6 X 10^-2

4.6 X 10^-3

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