Question # 1

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

An sp3 hybrid orbital contains

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1/4 a character

1/2 a character

2/3 a character

3/4 a character

In the Aluminothermite process, aluminium acts as.

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An oxidizing agent

A reducing agent

A flux

A Solder

Which of the following bonds will be non polar.

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N - H

O - H

C - H

C l - Cl

Which of the following are neutral ligands.

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NH3

H2O

CO & NO

All of above

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

The chief ore of aluminium is.

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Cryolite

Bauxite

Kaolin

Carnalite

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

Hydrolith is the common name of

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NaH

CaH2

NaF

CaF2

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

The commonly used catalyst in the manufacture of H2SO4

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Fe2O3 with a little CuO

v2O5

Platinized asbestos and MgSO4

All above

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

Aluminium does not corrode as does iron because.

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AI does not react with O2

a-protective layer of Al2O3 forms on the metal surface

AI is harder to oxidize than is Fe

Fe gives chathodic protection to AI

Ammonia is utilized for

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Manufacture of urea

Oxidation to nitric acid

Manufacture of ammonium sulphate

All above

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

Ground state electronic configuration of valence shell in N2 m lecule is written as (a2s)2, (o*2s)2 , (pi sp)4, (o2p)2, Hence, the bond order of N2 molecule is.

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1

2

3

0

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

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Ca

Mg

Ba

Sr

Which of the following compounds has highest boiling point.

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HI

HF

HBr

HCl

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