Question # 1

Xe reacts directly with

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O2

Cl2

F2

Br2

Which of the following element has six electrons in the valance shell but cannot exhibit a maximum co valency of six.

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Sulpher

Oxygen

Salenium

Both A and B

Which of the following metals form volatile carboyl with CO below 80^oC

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Cu

Fe

CO

Ni

The most common oxidation state of alkaline earth metals is.

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+1

+2

-2

-1

The electronic configuration of sodium (Z=11)

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1s2, 2s2, 2p4

1s2, 2s2, 2p6, 3s2 , 2p5

1s2, 2s2, 2p6, 3s1

1s2, 2s2, 2p6, 3s2

Which of the following state is not true with respect to copper.

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it is malleable and ductile

It is a best conductor of heat and electricity

It forms alloys easily

Moltan copper absorbed carbon dioxide

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

The oxidation state of Pt in Xe+ [Pt F6] is

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+4

+5

+6

None of these

The coordination number of closely packed hexagonal is.

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4

6

8

12

The gap between occupied and the unoccupied orbitals is not very large and the conduction of electricity is negligible at lower temperature and appreciable at high temperatures then it will be.

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Good conductor

Non conductor

Semi conductor

None of the above

Which metal burns in air at high temperature with the evolution of much heat.

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Cu

Hg

Pb

Al

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

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.

Which of the following compounds is must acdic.

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H2O

H2S

H2Se

H2Te

The correct order of second ionization potential of carbon nitrogen, oxygen and fluorine is.

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C > N > O > F

O > F > N > C

O > N > F > C

F > O > N > C

iodine is used as

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Tincture of iodine

Iodex and antiseptic

Treatment of goiter

All above

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

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Mn

Ni

Co

Zn

Greenish yellow gas with pungent irritating odour

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Chlorine

Fluorine

Iodine

Bromine

Which of the following exists as polymeric chains in solid state.

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

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