Question # 1

What % if nickel is present in the major ore Pentlandite.

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22%

18%

14%

10%

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

A molecule the cannot be susperimposed on its mirror image is said to exhibit which of the following.

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Geometrical isomerism

Optical isomerism

Linkage isomerism

Reactive isomerism

The formula of bleaching powder is.

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Ca OCl2

CaCIO3

Ca(CIO)3)2

CaOCI

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

Bryllium salts on hydrolysis give.

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Basic solutions

Acidic solutions

Neutral solutions

Amphoteric solutions.

Concentrated aqueous sodium hydroxide can separate a mixture of.

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Al3+ and Sn2+

Al3+ and Fe3+

Al3+ and Zn2+

Zn2+ and Pb2+

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

Since the acid gives both acidic and normal salts so the acid is.

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di acid

di basic

double salt

Any of above

The compound which does not act as Lewis acid is.

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BF3

AlCl3

BeCl2

SnCl4

HCIO4, HNO3 and HCL are all strong acids in aqueous solution inglacial acetic acid medium, their acid strength is such that.

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HCIO4 > HCL > HNO3

HNO3 > HCIO4 > HCl

HCl > HCIO4 > HNO3

The solution of the transition metal complexes having one or more unpaired electrons in the d-orbital are.

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Coloured

Colourless

White

None of above

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

Which of the following elements of group 15 is a typical metal.

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P

As

Bi

Sb

The purification of Bauxite can be carried out.

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Baeyer's process

Hall's process

Serpek's process

Any of above

H2SO4 acts as gent

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Reducing

Oxidizing

Both A and B

None of above

The first ionization energies of the elements of the first transition series. (Ti _____ Cu)

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Increases as the atomic number increases

decreases as the atomic number increases

Do not show any change as the addition of electrons takes place in the inner (n-1) d -orbitals.

Increases from Ti to Mn and then decreases from Mn to Cu

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

The alkali metal with highest melting point is

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K

Na

Li

Ca

Which of the following is not a proper use of Ni.

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It is used as catalyst

It is used in alloy formation

It is used in the preparation of Monel metal

It is attached by alkalis

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