Question # 1

Which of the following elements has the highest ionization energy.

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Na

Si

Ar

Cl

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

Shows a regular increase on moving down the group form carbon to lead

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Atomic volume

Atomic radius

Density

All above

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

Which of the following alkaline earth metals occurs in radioactive form in nature.

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Ca

Mg

Ra

Ba

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

Stainless steel contains.

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Fe + Cr+ Ni

Fe + Ni + Cu

Fe + Cr+ Cu

Cu + C + Ni

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+

Strongest inter molecular hydrogen bond is formed in

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H2O

NH3

HF

H2S

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

Which two atoms of hydrogen combine to form a molecule of hydrogen gas. the energy of the hydrogen molecule is.

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Higher than that of separate H atoms

Equal to that of separate H atoms

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H.

In each period the element with lest electron affinity belongs to.

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Group 1

Group 14

Group 17

Group 18

The common oxidation state of elements of group V A is.

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-3

+3

+5

Any above

Hydrogen gas will not redue

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Heated cupric oxide

Headed ferric oxide

Heated stannic oxide

Heated aluminium oxide

Which of the following is not an alkali metal

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Rb

Sb

Cs

Fr

The pH of the tears is

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7.0

7.4

7.8

8.2

Among sodium phosphate, sodium sulphate and sodium chloride the solubility in water increases as.

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Chloride > Phosphate > Sulphate

Sulphate > Pohosphate> Chloride

Chloride > Sulphate > Phosphate

Phosphate > Chloride > Sulphate

According to CFT the metal ligand bond is considered to be ionic to presentage.

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100%

90%

50%

70%

Aque regia is made by dissolving a mixture of HNO3 and HCl with ratio.

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1 : 1

1 : 3

1 : 2

1 :10

Electron gas theory fails to explain

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Specific heat of metals

Electrical and thermal conductivity

Paramagnetic behavior of metals

All of the above

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