Question # 1

Lithium shows diagonal relationship with

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Beryllium

Sodium

Magnesium

Calcium

Helium is used in weather balloons and airships instead of H2 becuse it is.

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Lighter than hydrogen

Incombustible

More abundant than hydrogen

Radiactive

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

Which of the following is the correct order of interactions.

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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole

Van der Waal's < hydrogen bonding < dipole -dipole < covalent

Van der Waal's < dipole -dipole < hydrogen bonding < covalent

Dipole-dipole < Van der Waal's < hydrogen bonding < covalent

One of the best fluorinating agent is

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XeF2

XeF4

XeF6

None of above

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

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 statements is not true.

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Transition metals form alloys

Transition metals form complexes

Zn, Cd and Hg are transition metals

K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

d2 sp3 is oriented in a manner

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Trigonal

Tetrahedral

Octahedral

Trigonal bipyramidal

The one in which the acceptor atom is of low positive charge, Large size and has several outer electrons which can be easily excited is a.

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Soft base

Hard Base

Soft acid

Hard acid

On industrial scale chlorine is prepared by

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Dennis method

Deacon's process

Plantner's process

Aludels process

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

Pick out the incorrect statement for Xe F6

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XeF6 is hydrolyzed practically to form XeOF4

It reacts with SiO2 to form Xe F4

On complete hydrolysis, it forms XeO3

It acts as F acceptor when treated with alkali metal fluoride, but cannot act as F donor to form complexes.

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

Zero group of the periodic table consists of.

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Four elements

Five elements

Six elements

Eight elements

Which of the following elements with excess oxygen to form proxides.

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Ca

Mg

Li

Ba

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