Question # 1

How many sigma and pi bonds are there in a CO2 molecule.

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2 sigma

2 sigma and 4 pi

2 sigma and 2 pi

4 sigma and no pi

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

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

Mostly used solvents for ionic compounds.

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Liquid ammonia

Liquid SO2

Liquid HF

All above

The first ionization energy in electron volts of nitrogen and oxygen atoms are respectively given by.

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14.6, 13.6

13.6, 14.6

13.6, 13.6

14.6, 14.6

Formula of orthophosphoric acid.

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H2PO4

H3PO3

H3PO2

H4P2O5

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

The attraction which exists between carbon dioxide molecules in solid carbon dioxide is due to.

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Van der Waal's forces

Molecule ion forces

ionic bonds

hydrogen bonds

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

Group VII A of periodic table consist of elements.

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4

5

6

7

Variable oxidation states is shown by

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Normal eleemnts

Metallic elements

Non metallic elements

Transition elements

The commonly used catalyst in the manufacture of H2SO4

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Fe2O3 with a little CuO

v2O5

Platinized asbestos and MgSO4

All above

Group III A of the periodic table consist of elemetns.

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3

4

5

6

The most important conditions for the formation of ionic bond are.

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High ionization energy of the metallic atom and high electron affinity of the non metallic atom.

Low ionization of the metallic atom and low electron affinity of the non metallic atom.

Low ionization energy of metallic atom and high electron affinity of the non metallic atom

High ionization energy of the metallic atom and high electron affinity of non metallic atom.

The movement of an electric charge produce a magnetic field is known from the

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Elementary Physics

Elementary Chemistry

Both A and B

None of above

The formula of sulphur sequioxide

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SO4

S2O7

S2O3

SO3

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

The aluminium alloy used to make parts of aircrafts is.

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Magnalium

Aluminium bronze

Duralumin

All of the these

An element with atomic number 20 is placed in which period of the periodic table.

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1

2

3

4

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.

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