Question # 1

Enfleurage process is used to extract the essential oils from

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Back of plant

Seeds of plant

Leaves of plant

Flowers of plant

Transition elements, in general, exhibit the following properties, except one, Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

Which of the following statements is not true for both B and Al

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They burn in oxygen to give oxides at high temperature

Their halides are Lewis acids

They combine with nitrogen to form nitrides

They react with HCl to form chlroides.

How many sigma and pi bonds are there in a CO2 molecule.

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2 sigma

2 sigma and 4 pi

2 sigma and 2 pi

4 sigma and no pi

The base which in not present in DNA is

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Adenine

Guanine

Thymine

Cytosine

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

Which of the following pollutant is generated from combustion of fuel.

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Smoke

SO2

CO2

Metallic oxides

All above

The equilibrium constant value for a chemical reaction is 5 x 10²⁰which of the following statement is true with respect to this value.

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Reaction will be reversible

Reaction will proceed in backward direction

Reaction is at equilibrium

Reaction will proceed in the forward direction

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

Which of the following linear polymer.

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Polypeptide

Protein

Starch

Phenol formaldehyde resin

The range of sound pressure which is painful is as

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130-140 dB

100 - 120 dB

90 - 80 dB

All above

In the process of electrosmosis

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Colloidial particles move towards the electrodes

Both colloidal particles and dis persons medium move

Only dispersion medium moves to carry the current

Positively charged colloidal particles move, but negatively charged particles remain stationary

The plate height is the length of the column divide by

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Length of the column

Width of the column

Number of theoretical plates

Number of components of the mixture.

What is graphene.

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A new material made from carbon nanotubes

A one atom thick sheet of carbon

This film made from fullerene

A software tool to measure and graphically respresent nanoparticles.

Which of the following is atmospheric pollutant.

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CO2

CO

O2

N2

Which of the following is not an ore of Cr.

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Chrome iron

Nicollite

Crocisite

Chrome ochre

Which of the following process is involved in getting back nitrogen into atomosphere.

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Nitrification

Denitricication

Ammonification

All above

The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is.

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5s1, 4d5

6s1, 5d5

6s1, 5d6

6s1, 5d4

Which one of the following statements if false with respect to CFT.

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In an octahederal crystal field. the d electron on a metal ion occupy the ex of orbitals before they occupy the t98 not of orbitals.

Diamagnetic metal ions cannot have an odd number of electrons

Low spin complexes can be paramagnetic

Low spin complexes contain strong field ligands.

The width of a typical DNA molecule is _______nm

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1

2

5

10

Iodination of benzene takes place in the presence of iodine and

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HNO3

HIO3

HgO

All of these

The group of steel are water hardened tool steels.

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Groups S

Groups W

Groups O

Group F

All naturally occurring processes spontaneously in a direction leads to.

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Decrease of entropy

Increase of entropy

Decrease in free energy

Increase in free energy

Consider the coordination compound Na2[Pt(CN)4] the Lewis and is

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[Pr(CN)4]2

Na+

Pt

Pt2+

Urea an enzyme used to estimate urea is a

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Hydrolytic enzyme

Oxidative enzyme

Reductive enzyme

Iso me rising enzyme

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

The number of moles of solute dissolved in 1000 gram of the solvent is called

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Formality

Molality

Molarity

Mole fraction

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

When two bodies have equality of temperature with a 3rd body they in turn have equality of temperature with each other. This is a statement of.

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First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

The property measured in TGA is

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Change in weight

Rate of change in weight

Heat envolved and absorbed

Change of temperature.

Increased asthmatic attacks in certain seasons are related to.

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Inhalation of seasonal pollens

Eating of seasonal vegetables

Low temperature

Wet and dry environment

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