Question # 1

The number 8.47 is rounded to

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8.5

8.4

8.7

8.6

Which of the following source is commonly used as excitation source in fluorimeter.

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Tungsten lamp

Mercury vapour lamp

Nernst vapur lamp

Radio souse

Which of the following statement is not related to BVT

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individual orbitals lose their indention

VBT uses the concept of resonance

VBT does not explain the paramanhetic nature of molecule

it uses only valence electron

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

The IUPAC suffix used for ______ NC group is

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Cyanide

Isocyanides

Carbylamines

Nitrite

For each value of l. the number of m velocity are.

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n²

2l

(2l+1)

(n+1)

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

Graphite is a good conductor of electricity because is.

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Has sp2 hybridized carbon stoms

Has free electrons

Is crystalline

Has free atoms

Elements in which differentiating electron enters the (n-1) the d-orbitals of the (n-1) the main shell are called elements.

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s- block

p-block

d-block

f-block

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

Which of the following solids is a better conductor of electricity.

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Pore NaCl cyrstal

Diamond

Graphite

Marble pieces

Proteins have characteristics

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Melting poirn t

Iso electric point

Boiling point

All of these

Which of the following enthalpies is always negative.

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Enthalpy of melting

Enthalpy of combustion

Enthalpy of solution

Enthalpy of formation

In an isochoric process

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Energy remains constant

Volume remains constant

Pressure remains constant

Temperature remains constant

Which of the following acid radical gives chromyl chorate test.

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F-

I-

Cl-

Br-

The total number of crystal systems and the number of Bra via is lattices are.

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7,7

7,14

14,7

14,28

Compounds HCN and HNC are.

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Tautomers

Metamers

Functional isomers

Conformers

Xe reacts directly with

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O2

Cl2

F2

Br2

Which of the following is a buffer solution.

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CH3COOH + NH4OH

CH3 COOH + HCl

CH3COOH + NaOH

CH3COOH + CH3COONa

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

Which among the following is a Talse statement.

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SO3 is obtained by the catalytic oxidation of SO2

SO3 has trigonal planar geometry in gaseous state

SO3 in nauseous state has all S-O bonds equivalent

SO3 gas shows more solubility in water than in H2SO4

The basic strength of hydrides of group 15 elements very in the following order.

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NH3 > PH3 > AsH3 > SbH3 >BiH3

PH3 > NH3 > AsH3> SbH3 > BiH3

BiH3> NH3 >PH3 > AsH3 > SbH3

NH3 > PH3 > SbH3 > AsH3 > BiH3

Which of the following elements with excess oxygen to form proxides.

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Ca

Mg

Li

Ba

Neon is used in neon signs for advertising purpose because.

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Neon lights are visible from long distance

Neon light are visible though fog & mist

Both A and B

None of the above

Which of the following expressions represent the equivalent conductance.

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A = l s x 1000/V

A = Ls x 1000/C

A = Ls l/A

A = Ls/V

The number of significance figures in the number 80.7 is.

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1

2

3

4

On industrial scale chlorine is prepared by

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Dennis method

Deacon's process

Plantner's process

Aludels process

Potassium sulphate with 48% to 52% potash, is made from.

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Potassium phosphate

Potassium Chloride

Potassium Nitrate

None of these

Which of the following is not a property of Ni.

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it is a soft silvery white metal

It is malleable and ductile

It is highly magnetic

It has high electrical and thermal conductivities

Each of the following compound is an aromatic except.

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Benzene

Naphthalene

Cyclopentadienyl cation

Cyclopentadienyl anion

The pH of milk is

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6.0

6.5

7.0

7.5

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