Question # 1

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

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

Sodium silicate is ued

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In fire proofing of wood and textiles

As a preservative of eggs

As a furniture polish

All above

The penultimate shell of carbon contains electrons.

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s2

s2p6

s2p6d10

s2p6d8

Which of the following is the correct order of interactions.

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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole

Van der Waal's < hydrogen bonding < dipole -dipole < covalent

Van der Waal's < dipole -dipole < hydrogen bonding < covalent

Dipole-dipole < Van der Waal's < hydrogen bonding < covalent

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

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

Noble gases are sparingly soluble in water owing to.

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Dipole -dipole interactions

Dipole -induced dipole interactions

Hydrogen bonding

Induced dipole -instantaneous dipole interactions

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

LiAIH4 is most useful reducing agent It reduce to alcohol

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Aldehydes

Ketone

Carboxylic acid

Any of above

Acid rain effects

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Human being

Crops

Aquatic life

All above

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

Relative order of acidity of HF, HCl, HBr, and HI acids is

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HCl > HBr > HI > HF

HF > HCl > HBr > HI

HI > HBr > HCl >HF

HF > HI > HCl > HBr

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

The most common oxidation state of alkaline earth metals is.

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+1

+2

-2

-1

Which one of the following sets of elements has the strongest tendency to form positive ions in gaseous state.

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Li, Na, K

F, Cl, Br

Be, Mg, Ca

O, S , Se

In the fourth flotation process for the purification of ores, the ore particles floats because.

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They are light

Their surface is not easily wetted by water

They bear electrostatic charge

They are insoluble

Which of the following elements does not impart any characteristic colour to the flame.

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Ca

Mg

Ba

Sr

The only oxidation state of alkali metals in their compounds is.

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+1

+2

-1

0

d2 sp3 is oriented in a manner

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Trigonal

Tetrahedral

Octahedral

Trigonal bipyramidal

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

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