Question # 1

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

Which of the following property is not related to aluminum.

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it is silvery white metal with brilliant lusture

It is a very light metal with specific gravity as 2.7

It is good conductor of heat

It is the least reactive element of III Group.

The geometry of the molecule is primarily decided by

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Bond pairs around the central atom

No of k bond around the central atom

No of bond pairs as well as lone pairs around the central atom

No. of lone pairs on central atom

For covalent bond to form between two atoms A and B

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Transference of electrons must take place from A to B

A pair of electrons of A is shared by both A and B

A and B contribute equal no. of electrons for mutual sharing by A and B

One of the atom A or B must already have octet of electrons.

The nature of bonds in compounds of carbon and silicon is mostly

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Covalent

Electrovalent

Metallic

Both A and B

Which halide of cesium will be highly ionic in nature.

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K+

Ag+

Rb+

Ca+

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

In order to understand the nature of H , bond the theory has been suggested.

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Electrostatic approach

Molecular orbital approach

Valance bond approach

All the above approaches

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Which of the following process is not involved in the purification of bauxite.

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Bayer's process

Serpek's process

Hall's process

Goldsmith's process

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

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CaO

CaCl2

CaCO3

Ca(NO3)2

Lux -Flood concept is a dono-acceptor system of.

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Proton

Electron pair

Neurtron

Oxide ion

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

Elements in the same vertical group of the periodical have same

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Number of electron

Atomic number

Number of valence elections

Electronic configuration

Which one of the following oxides is basic.

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MnO

Mn2O3

MnO2

Mn2O7

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

The Ostwald process is the main method for the manufacture of nitric Acid in the fist step in this process is.

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Nitrogen and hydrogen react to form NH3

Ammonia is burned in O2 to generate N2 and H2O

Nitrogen and oxygen react to form NO2

Ammonia is burned with O2 to generate NO and H2O

Fluorine does not show variable oxidation state because of.

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its high electronegativity

Its small sixe

low dissociation energy of F-F bond

Non availability of d-orbitals

Reacts violently with water

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AlH3

AlCl3

Lia IH4

Al2Cl6

Which of the following elements has the highest value of IE.

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Na

K

Mg

Ca

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