Question # 1

Used for sterilizationof drinking water

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F

Br

Cl

I

Al Cl3 is used in

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Manufacturing of petrol

In borax bead test

Prezervation of food

All above

Monel metal is a alloy of Ni which constrains Ni uptown

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50%

60%

70%

80%

Which of the following statements about anhydrous aluminium chloride is correct.

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It exist as AlCl3 molecules

It is not easily hydrolysed

It sublimes at 100 ^oC under vacuum

Boron does not form B³⁺ ions

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

The first ionization energy of Mg is lower than

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Na

Ca

Al

Be

Solid substances consist of an ordered any of ions and solid as a whole is electrically.

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Conductor

Neurtal

Acidic

Basic

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

Which one of following is paramagnetic and has the bond order equal to 0.57

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N2

H2+

O2

F2

When Phosphate rock Ca3(PO4) 2 is converted to phosphorus.

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One of the products of the reaction is water

Sulphuric acid is added to generate insoluble calcium sulphate

Hydrogen is used to reduce the phosphate to phosphorus

Silica is added to form a calcium silicate slag

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

in monel metal copper is alloyed wiht which metal.

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Fe

Mn

Ni

All

Transition elements, in general, exhibit the following properties, except one, Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

In urea the amount of nitrogen is

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82.0%

46.0%

33.0%

21.0%

Metals are

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Transparent

Tranalucant

Opaque

None of above

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

Which of the following orbitals has maximum penetration effect.

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s

p

d

f

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

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

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One

Two

Three

Four

Which of the following is the third most abundant element in the nature.

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Oxygen

Sulphur

Aluminum

Hydrogen

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