Question # 1

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

Of all the noble gaes, easily available gases are

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He & Ar

He & Ne

Ne & Ar

Xe & Kr

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

In the long form of periodic table, elements are arranged according to.

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Increasing atomic number

Decreasing atomic number

Increasing atomic mass

Decreasing atomic mass

iodine is used as a

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Photography

Manufacture of dyes

Analgesic

All above

Dry ice is

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Solid CO

Solid CO2

Solid NH3

Solid SO2

All the member of group III A are metals except.

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B

Ai

Ga

In

Used in filling luminous tubes.

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Xenon

Krypton

Radon

Helium

The dipole moments of the given species are such that.

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BF3 > NF3 > NH3

NF3 > BF3 > NH3

NHE > NF3 >BF3

NH3 > BF3 > NF3

Which among the following is a false statement.

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SiO2 has a structure similar to that of CO2

Natural Si exists only in the combined state

Si can be prepared by reducing SiO2 with Mg

Si does not exist in graphite like structure, but exists only ni diamond like structure.

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

Argon is used in filling of.

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Discharge tubes

Luminous tube

Fluorescent tubes

None of above

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

The purification of Bauxite can be carried out.

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Baeyer's process

Hall's process

Serpek's process

Any of above

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4

Electronegativity of Oygen is.

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2.5

3.5

2.4

2.1

A combination of atomic orbitals produces a large number of closely special energy states brown as.

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Packet of energy

Band of energy

Botha a and b

None of the above

Electron affinities of halogens are in the order.

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F > Cl > Br > I

Cl > F > Br > I

Cl > Br > I > F

Cl > Br > F > I

The energy gap between tag and eg sets in denoted by

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A-

10 Dq

Both A and B

None of above

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.

Which of the following process is used for the conversion of matte is to nickel.

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Orford process

Mond's process

Electrolytio process

All

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