Question # 1

Which is not an ore of aluminium.

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Baxuite

Cryolite

Monazite

Corundum

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 gas theory fails to explain

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Specific heat of metals

Electrical and thermal conductivity

Paramagnetic behavior of metals

All of the above

Which of the following elements does not impart any characteristic colour to the flame.

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Ca

Mg

Ba

Sr

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

Which of the following statement is not correct.

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The element with highest IE belongs to group 18

In each period the element with lowest IE belongs to group I

In each period the element with highest IE is a noble gas

In the second period as we move from left to right, ionization energy increases reqularly.

Red colour of glass of due to the presence of

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Cu2O

CoO

MnO2

CdS

Hydrogen bond is not electrostatic in nature is stated by

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Electrostatic approach

Valence bond approach

Molecular orbital approach

None of the abvoe

Used in producing intense light in cinematography

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Xenon

Krypton

Radon

Helium

The concentration of OH- ions in a certain household ammonia solution is 0.0025. This ammonia solution is.

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Basic

Acidic

Neutral

None of above

Fluorine form Fluorides reacting with

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Metals

Non metals

Metalloide

Any of above

Chlorine gas acts as a bleaching agent only in presence of.

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dry air

Moisture

Sunlight

Pure oxygen

Keeping in view the periodic law and periodic table, suggest which of the following elements should have maximum electronegative character.

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Oxygen

Nitrogen

Fluorine

Astatine

Of all the noble gaes, easily available gases are

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He & Ar

He & Ne

Ne & Ar

Xe & Kr

Which of the following has the maximum tendency to form complexes.

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K

Na

Rb

Li

Fluorine finds considerble use of DDFT which is used as.

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herbicide

Fungacide

Insecticide

Nomatocides

Ca H2 on reaction with water liberates

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H2

O2

Botha of these

None of these

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

Which of the following element has six electrons in the valance shell but cannot exhibit a maximum co valency of six.

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Sulpher

Oxygen

Salenium

Both A and B

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