Question # 1

CFSE for d⁷ ion is.

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0.8

-0.8

-1.8

1.8

Law of octaves was proposed by

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Lother meyer

D.I.Mendeleev

J.A.R. Newlands

J.W. Dobereiner

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

In which of the following characteristics does hydrogen resemble halogens.

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Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

Which is the purest form of iron.

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Pig iron

Cast iron

Wrought iron

Steel

Nitric acid has the property

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Nitrating

Reducing

Redoxing

None of above

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

The most stable oxidation state of chromium is.

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+6

+3

+4

+2

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

Which of the following is not a property of Cr.

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it is brilliant silvery metal

it is malleable

It can take very high polish

Its surface is tarnished easily

Dolmite is a mineral whose formula is.

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CaCO3

Mg CO3

CaCO3, MgCO3

CaSO4

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+

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

Which of the following is most soluble in water

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CaSO4

Sr SO4

MgSO4

BaSO4

Which of the following is diamagnetic

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O2

O2+

O2-

O2 ^2-

Which of the following does not apply to metallic bond.

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Overlapping valence orbitals

Mobile valency electron

Delocalized electrons

Highly directed bonds

The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called.

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calcination

Roasting

Froth floatation

Bessemerization

How many varieties of commercial iron are known.

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1

2

4

3

Explosive trioxide XeO3 is produced when

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XeOF4 reacts with water

XeOF4 reacts with silica

XeF4 reacts with water

Any of above statements

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .

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2

1

0

3

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