Question # 1

Trimethylamine is a weaker base than dimethylamine is explained by

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Steric effct

Resonance effect

Inductive effect

All above

Which of the following have +3 oxidation states.

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B & AI

In & TI

B & In

AI & TI

Which parameter of a chemical reaction will change with the use of a catalyst.

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Delta F, change in free energy

Delta S, change in entropy

Delta E , change in internal energy

K, the rate constant

Which of the following anionic species is not separated by gravimetric analysis.

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Cl-

SO4

CH3COO-

PO4

In which property listed below hydrogen does not resemble alkali metals.

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Tendency to form cation

Nature of oxide

Combination with halogens

Reducing character.

Non localised bonds are referred as

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Metallic bond

Long range bonds

Ionic bond

Covalent bonds

SAN is a polymer of

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Styrene

Acrylonitrile

Both A and B

Vinyl chloride

The mole of photon is knonw as.

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Quantum

Einstein

Energy packet

None of the above

Lux -Flood concept is a dono-acceptor system of.

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Proton

Electron pair

Neurtron

Oxide ion

The size of quantum dot is ________________m

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5

5 x 10^-9

5 x10^-10

5 x10^-11

________is best in its cleaning action.

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Soap

Detergents

Surfactant

None of these

In bi sulphate ion, the formal charge on sulphru atom is.

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+1

+2

+4

+6

What is called black gold.

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Petroleum

Coal

Coal tar

Natural gas

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

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100%

90%

50%

70%

Which of the following statement is not true with respect to photo chemical reactions.

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These take place in the presence of light

Free energy of these reactions may be positive or negative

Light intensity affect these reactions

Temperature has significant affect n rate of these reactions

D(+) glyceraldebydes has the absolute configurtion.

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E-

S-

E-

Z-

What is the most undesirable of all the elements commonly found in steels.

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Sulphur

Phosphorus

Silocn

Magnesium

The temperature at which the vapour pressure becomes equal to external pressure is called.

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Saturation point

Critical temperature

Consolute temperature

Boiling point

The cooling of molten urea by air in the tower is called.

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Prilling

Evaporation

Condensation

Distillation

Which of the following properties of a system does not change in a state of equilibrium.

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Density

Pressure

Colour

All above properties

In normal mode of operations of liquid liquid partition, a polar stationary phase is used with a non polar mobile phase Which of the following solvent is used as mobile phase.

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Ethanol

Propanol

Butanol

Hexane

To complete transfer of a shared pir of electrons to one of the atoms joined by a double or triple bond at the requirement of an attacking reagent is known as.

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Inductive effect

Resonance effect

Eletromeric effect

Stark effect

The common temperature detecting device in DTA are.

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Thermocouples

Thermopiles

Thermistore

All

Which of the following colligative properties can be used to characterize colloidal particles.

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Lowering in vapour pressure

Elevation in boiling point

Depression in freezing point

Osmotic pressure

Coulometry is based on the measurement of

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Electrical current

Electrical potential

Electrical conductance

Dielectric constant

Variable electrovalency is due to the following reasons.

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Unstable configuration of core

Inset electron pair effect

All of above

None of above

Layer of the C -atom in graphite are hold together by

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Covalent bonds

Free electrons

Ionic bond

Van Dar Waals forces

During sintering densification is not due to

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Atomic diffusion

Surface diffusion

Bulk diffusion

Surface tenstion

What element is added to copper to increase its strength and fatigue propertioes.

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Silicon

Aluminium

Beryllium

Copper

Considering the elements F, Cl ,O and N, the correct order of their chemical reactivity in terms of oxidizing property is.

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F > Cl > N

F > O > Cl > N

Cl > F > O > N

O > F > N > Cl

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

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Soddy

Slater

Fajan

Linus pauling

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