Question # 1

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

A catalyst

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Actually participates in the reaction

Changes the equilibrium concentration of the products

Does not affect a reaction energy path

Always decreases the rate for a reaction

Which is the correct configuration of Fe3+ (Z= 26)?

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[Ar] 4s² , 3d⁶

[Ar] 4s² , 4d⁵

[Ar] 3d⁵

None of these

HCIO evolves Cl2 and O2 when dissolve

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Ca

Ni

Cu

Any of above

The criteria for aromatically is presence of

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Uneaturations

Cyclic structure

Presence of 4nx electrons

Presence of 4n + 2n electrons

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

How many planes of symmetry are present in benzene.

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1 plane

3 planes

5 planes

7 planes

The unit of sodium chloride structure is.

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Linear

Cubic

Tetrahedral

Square planner

What exactly is quantum dot

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A semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes or excitation in all three spatial directions

The sharpest possible tip of an atomic force microscope

A fictional term used in science fiction for the endpoints of wormholes

Unexplained spots that appear electron microscopy images of nanostructures smaller than 1 nanometer

If the values of standrd deviations for the first and second method differ, then which of the following test helps one to know whether this difference is significant.

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Student's test

F-Test

Chi square test

Standard deviation

Eosin dye belongs to the group of dyes known as.

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Nitroso syes

Triphenylmethane dyes

Diphenylmethane dyes

Phthalein dyes

Ten elements Sc (Z = 21) to Zn (Z = 30) fill their 4s orbitals first and then 3d orbitals are called elements. of.

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3 d series.

4d Series

5d Series

None of above

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

An optically active compound

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_{Must contain at least favour carbons}

When in solution rotate the plane of polarized light

Most always contain an asymmetric carbon atom

In solution always give negative reading in polarimetre

In graph of atomic volume versus atomic weight the elements corresponding to peaks in the curve belong to.

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Group 1

Group 18

Group 4

Group 14

An indicator for an acid base titration is a

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Weak acid

Weak base

Strong acid

Strong base

Both A and B

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal

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N2O5

HNO3

SO2

SOCl2

Length of semiconductor nanorods are in the range of.

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1.50 nm

1-50 micro meter

100-500 nm

50-100 nm

Which of the following technique is used to separate substance based on their charge to mass ratio.

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HPLC

HPTLC

GC

Electrophoresis

Each fat or oil in made up of

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A distinctive mixture of several different triglycorides

A distinctive mixture of several aldehydes

Mixture of above both

None of above

Which of the following compounds is electrovalent in nature.

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SO2

ICI

KBr

CHI3

Which of the following is raw material not present on the cement.

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Lime stone

Gypsum

Red lead

Blast furnace slag

Which of the following has the bighest value.

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Transnational partition function

Rotational partition function

Vibrational partition function

Electronic partition function

Enfleurage process is ued to extract the essential oils from

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Bark of plant

Seeds of plant

Leaves of plant

Flowers of plant

In order to give strength and elasticity natural rubber is heated with.

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Sulphur

Oxygen

Nitrogen

Chlorine

Which of the following class of compounds follow the criteria of aromatically.

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The compounds must have high degree of unsaturation

they must have the property to undergo addition reactions

They must have the property to undergo substitution reactions

They must have the ability to sustain an induced current in NMR

Peppermint oil contains.

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Menthol

Thymol

a-pinene

Comphene

Which of the following technique is useful to remove metal ions from an interfering matrix.

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Solvent extraction

Electrophorests

Cataphorests

Gel permeation

The molecule returns from the first excited triplet sate to the ground state singlet. The light emitted in known as.

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Inter system crossing

Phosphorescence

Fiuoreacence

Quenching

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