Question # 1

Main constituent of all inorganic matter

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Carbon

Silicon

Tin

Lead

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

H-Bond has a preferred bonding direction like

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Ionic bond

Covalent bond

Co ordinate bond

None of these

The element with the highest first ionization potential is.

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Boron

Carbon

Nitrogen

Oxygen

The vapours attacks the eyes and mucous membrane of nose and throat

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F

Cl

I

Br

Pick out the incorrect statement regarding ozone.

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O3 is an unstbale dark blue diamagnetic gas

The central oxygen in O3 is sp3 hybridized

It cause the tailing of mercury

It does not react with KOH

The electromagevitiy of the following elements increase in the order

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F > Cl > O > S

S > Cl > O > F

F > O > N > C

C > O > N > F

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

Ionic bond are also forces called as.

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Polar bond

Electrovalent bond

None polar bond

Both A and B

The element having highest ionization energy and least electron affinity belong to

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Period 1 , group 18

Period 2, group 17

Period 2, group 1

Period 2, group 2

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

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

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Ca

Mg

Ra

Ba

The first ionization energies of the elements of the first transition series. (Ti _____ Cu)

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Increases as the atomic number increases

decreases as the atomic number increases

Do not show any change as the addition of electrons takes place in the inner (n-1) d -orbitals.

Increases from Ti to Mn and then decreases from Mn to Cu

Pick out the incorrect statement

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The geometry around 'N' atom in trimethylamine is pyramidal

The geometry around N atom in trisilylamine is planar

The nitrogen atim is trimethylamine is sp2 hybridized whilst in trisilylamine it is sp2 hybridized

Trisilylamine has donor properties whilst trimethylamine has no donor properties.

Which one of the following noble gas is obtained by radioactive disintegrastion

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Kr

Br

Rn

Xe

The concept is also known as proton donor acceptor system.

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Bronsted Lowery

Lewis

Lux Flood

Usanovich

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

Electronegativity of Oygen is.

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2.5

3.5

2.4

2.1

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 aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

Which of the following is the third most abundant element in the nature.

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Oxygen

Sulphur

Aluminum

Hydrogen

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