Question # 1

Which of the following analytical method is used for the separation of dissolved components from solutions.

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Chromatography

Dialysis

Solvent extraction

Distillation

Which of the following process involves the use fo organic compound as an electron acceptor.

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Aerobic respiration

Anaerobic respiration

Fermentation

Glycolsis

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

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

The tensile strength of a carbon nanotube is __________ times that of steel.

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10

25

100

1000

Which among the following is insoluble in water.

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LiOH

KOH

NaOH

RbOH

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

Which of the following radical is not a member of IV group.

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

Which of the following statement is not true with respect to hydrocarbons.

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They are gaseous and liquids

They can be saturated or unsaturated

They in air by themselves alone cause harmful effects

They form photochemical oxidants

Biomass refers to all the organic material derived from

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Photolysis

Photosynthesis

Electrolysis

Oxidation

A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .

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2

1

0

3

Cobalt salt imparts which colour to the borax bead

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Blue

Green

Red

Yellow

Which of the following steps is not involved in chemical analysis.

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Separation of sample in pure form

Separation of the sample in the mixture form

Preparation of sample for the analyisis

Validity of experimental results

Which of the following molecule contains two dative bonds according to Lewis structure.

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NH3

SO3

PCl5

BF3

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

The bond between two identical non metal atoms has a pair of electrons.

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Unequally shared between the two

Transferred fully from one atom to another

With identical spins

Equally shared between them

The alkaline hydrolysis of fat is know as

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Condensation

Esterification

Saponification

Emulsification

Which of the following statement is true.

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Ferromagnetic separation is used to remove rion impurities from bauxite.

Aluminium is an amphoteric element which means that it can act as an oxidizing agent and as a reducing agent

Aluminium has a strong attinity for oxygen

Aluminothermic reactions are endothermic

Among group IA elements, melting point

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Increases down the group

Decreases down the group

Do not show any regular trend

Remains constant

Which of the following is not a biodegradable polymer.

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Protein

PVC

Cellulose

Nucleic acid

The Schrodinger equation when solved for any system gives.

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The mean force path

The Polarizability

The energy function

The wave function

The formula of Bauxite is.

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Al2O3

Al2 O3. 2H2O

AL2O3, H2O

Na3AIF6

Pick out incorrect statement about K2Cr2O7

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It oxidizes acidified solution H2SO4 to S

It oxidizes KI to I2

It oxidizes HCl to Cl2

It gives oxygen, when treated with cold conc. H2SO4

Molten iron withdrawn from the blast furnace is called.

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Wrought iron

Pig iron

Bessemer iron

Stainless steel

Which metal burns in air at high temperature with the evolution of much heat.

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Cu

Hg

Pb

Al

CO belong to which group.

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C_2v

D_2h

C_av

D_ah

A catalyst increases the rate of a reaction because.

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It provides the necessary energy to the colliding molecules to cross energy barrier

It decreases the heat of the reaction

It decreases the order of the reaction

It provides a different path of lower activation energy.

Iron which contains up to 1% carbon is called.

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Steel

Cast iron

Wrought iron

Pig iron

The property measured in DTA is

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Heat effects

Weight loss

Rate of change in weight

Change in temperature

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

In extraction of iron, the furnace charge consists of iron ore, coke and limestone. The function of limestone is to act as.

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An oxidation agent

A reducing agent

Flux

Slag

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