Question # 1

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

Helium is used in weather balloons and airships instead of H2 becuse it is.

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Lighter than hydrogen

Incombustible

More abundant than hydrogen

Radiactive

The specific gravity of H2SO4 is

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1.37

1.84

1.17

1.57

Which is incorrect statement for Xe F2.

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It has linear structure.

It is hydrolyzed rapidly in aqueous solution of a base

It oxidizes Cl and I to Cl2 and I 2 respectively

It cannot act as F donor

Metals are

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Transparent

Tranalucant

Opaque

None of above

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

Black and white photographic film contain small grains of.

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Silver bromide

Silver cholride

Silver iodide

Any of above

Molecules have zero dipole moment

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CO2

BCl3

CH4 & CCl4

All above

Which of the group 13 element does not form M (III) idodie.

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Al

Ga

Ti

In

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

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

The yellow colour of chromates changes to orange red on acidification, due to the formation of.

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Cr3+

Cr2O3

Cr2O7^2-

Cro3

Zeigler Natta catalyst is.

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Pt/PtO

TiCl4/Al(C2H5)3

Pt/Rh

Pt

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide or comentite

Graphite

Partly as iron carbide and partly as graphite

The correct increasing order of bond dissociation energy for N2, O2, F2 and Cl2 is

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N2 < O2 < F2 < Cl2

F2 < Cl2 < O2 < N2

F2 < Cl2 < N2 < O2

N2 < Cl2 < F2 < O2

Aluminium is used for.

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Making ultensile & framea

Making alloys

Reducing agent

All above

Which of the following alkaline earth metals occurs in radioactive form in nature.

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Ca

Mg

Ra

Ba

The elements with highest electron affinity belongs to.

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Period 2 , group 17

Period 3, group 17

Period 2, group 18

Period, 2 , group 1

Aque regia is made by dissolving a mixture of HNO3 and HCl with ratio.

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1 : 1

1 : 3

1 : 2

1 :10

Beryllium shows diagonal relationship with.

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Mg

Al

Na

B

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