Question # 1

At high temperature nitrogen combines with calcium carbide to give

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Calcium cyanide

Calcium cyanamide

Calcium nitride

Calcium cabonate

Aluminothermy used for on the spot welding of large iron structures is based upon the fact that.

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As compared to iron, aluminium has greatest affinity for oxygen.

As compared to aluminium, iron has greater affinity for oxygen

Reaction between aluminim and oxygen endothermic

Reaction between iron and oxygen is endothermic

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

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

Considering the element B,C, N, G and Si, the correct order of their non- metallic character is.

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B > C > Si > N > F

Si > C > B > N > F

F > N > C > B > Si

F > N c > > SI > B

Which of the following reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

The following oxo acids have been arranged in the order decreasir acid strength identify the correct order.

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III > IV > II > I

III > II > I >IV

I > II >III > IV

IV > III > II > I

Molecules have zero dipole moment

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CO2

BCl3

CH4 & CCl4

All above

Which of the following elements has the highest melting point.

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Magnesium

Calcium

Strontium

Berylliium

Which name is associated with the rules which help in predicting the portability of anion.

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Soddy

Slater

Fajan

Linus pauling

Which of the following does not form stable diatomic molecule.

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Nitrogen

Phosphorus

Hydrogen

Oxygen

Which of the following is planar?

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CH2Cl2

CHCl3

CCl4

C2H2

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

Setting of plaster of Paris volves.

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Oxidation with atmospheric oxygen

Combination with atmosphere CO2

Dehydration

Hydration to yield another hydrate

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

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Kr

Br

Rn

Xe

Which one of the following does not exhibit paramegnetion.

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NO

NO2

CiO2

CIO-2

The magnitude of electron affinity depends on.

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Atomic size

Nuclear charge

Electronic configuration

All of the above

Zero group of the periodic table consists of.

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Four elements

Five elements

Six elements

Eight elements

Boron does not form B3+ ion because.

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It has small size and high ionization energy

It has high electromagnetically

It has high charge density

None of the above

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

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