Question # 1

Arrange the following in order of increasing boiling point.

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CH3OH < CH3Cl < RbCl < CH4

CHOH < CH4 < CH3Cl < RbCl

RbCl < CH3Cl < CH3OH < CH4

CH4 < CH3Cl < CH3OH < RbCl

In Serpekr's process the ore is treated with which of the following.

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Carbon

Nitrogen gas

Both A and B

None of these

Which among the following hydride is ionic in nature.

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Ammonia

Protium oxide

Calcium hydride

Sulphane

The acetylene molecule contain a

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Single bond

Double bond

Triple bond

Co ordinate bond

In which of the following characteristics does hydrogen resemble halogens.

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Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

Pick out the incorrect statement for transition metals.

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Cu+ is not a transition metal ion

Transition metals do not exhibit variable oxidation states

Transition metal ions are coloured

Transition metals and majority of their compounds are paramagnetic

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

The noble gases are found in the atmosphere to the extent of about some percent by volume.

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0.5%

1.0%

1.5%

2.0%

A colorless gas with pleasant odour and sweet taste.

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N2O

N2O3

NO

N2O4

iodine is used as

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Tincture of iodine

Iodex and antiseptic

Treatment of goiter

All above

Which of the following has the maximum ionic character.

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HF

HCl

HI

HBr

Among the elements A, B,C and D having atomic numbers 7,8,9 AND 12 Respectively, the element with smallest size and highest IE is.

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A

B

C

D

The noble gases are used due to having property

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Chomical inertness

Low boiling point

Any of a or b

Both a and b

H-Bond has a preferred bonding direction like

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Ionic bond

Covalent bond

Co ordinate bond

None of these

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

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

Which one has a co ordinate bond.

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Al2Cl6

BF3

NaCl

O2

Drying agent which react with CO2 and removes water vapours is.

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CaO

CaCl2

CaCO3

Ca(NO3)2

Sodium Tetra borate is used

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As alkaline buffer in dying & bleaching process

In manufacture of opticl glass

in enameling and making glaze

All above

What is the following is incorrect.

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Water is more polar than H2S

H2O2 is a planar molecule

Heavy water is produced by the exhauative electrolysis of water made acidic

H2O2 act both as oxidising as well as reducing agent in acidic medium

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

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