Question # 1

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

The correct order of electron affinities is.

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C > Si, > Na > Ar

Si > Cl > Na > Ar

C > Na > Si > Ar

C > Si > Ar > Na

The first noble gas compound was

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XeO3

XeF4

XeF6

Xe +[PtF6]

Which of the following statements is incorrect.

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The elements of group 18 are known as aerogens.

Group 2 elements are all metals

Metallic character increase on going down a group

All the elements belonging to a particular period have same valence shell configuration.

Which librates H2 with NaOH

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B

AI

Zn

All

Oxides ores of Aluminium

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Corundum

Bauxite

Diaspore

All above

Magnesium burns in air to give.

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MgO

MgCO3

Mg3N2

Both A and C

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

Of all the noble gaes, easily available gases are

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He & Ar

He & Ne

Ne & Ar

Xe & Kr

The noble gases are used due to having property

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Chomical inertness

Low boiling point

Any of a or b

Both a and b

Which metal can produce dihydrogen gas by reaction with dil H2SO4

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Ag

Fe

Cu

Pt

Which of the following compounds is must acdic.

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H2O

H2S

H2Se

H2Te

SO2 acts as

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Lewis base

Lewis acid

Botha A and B

None of above

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.

In the electrolysis of alumina, cryolite is added to.

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Lower the melting point of alumina

Increase the electric la conductivity

Minize anodize affect

Remove impurites from alumina

Group IV A consist of elements.

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3

4

5

6

Which of the following molecule does not contain the covalent bond between similar atoms.

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N2H4

F2O2

H2F2

H2O2

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

A boy accidently splashes a few drops of conc. H2SO4 on his cotton shirt. A few minutes later, the splashed part blacken and holes appear.This is because the sulphuric acid.

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Heats up the cotton so that it burns

Dehydrates the cotton

Causes cotton to react with oxygen of the air

Removes the elements of water from cotton

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

Electron affinities of halogens are in the order.

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F > Cl > Br > I

Cl > F > Br > I

Cl > Br > I > F

Cl > Br > F > I

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