Question # 1

The type of bonding in HCl is

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Pure covalent

Polar covalent

Highly polar

Hydrogen bonding

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

A well packed column may hve

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100 plates /m

1000 plates /m

10 plates /m

10,000 plates/m

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

What refers to the removal of zinc from brasses?

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Dezincification

Graphitization

Stabilization

Denitration

Which of the following is a buffer solution.

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CH3COOH + NH4OH

CH3 COOH + HCl

CH3COOH + NaOH

CH3COOH + CH3COONa

The principal quantum number determines the overall size of the orbital and energy of the electron when it is associated with the orbital.It may have the values.

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n = 1,3,5.........infinity

n= 2,4,6................infinity

n = 1,2,3,4..............infinity

None of the abvoe

Which of the following phenomenon are driven by solar energy.

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Winds

Water cycle

Production of biomass

All above

Which one of the following is natural polymer.

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Starch

Nylon-6

Neoprene

Buna-S, SBR

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 has cubic structure.

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Sodium chloride

Potassium Chloride

Diamond

All of above

In order to increase the rate of the reaction one should.

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Increase the concentration of products

Decrease the concentration of reactants

Decreases the concentration of products

Both C and D statement are correct

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

When to a solution of weak electrolyte a strong electrolyte with a common ion is added, the dissociation of weak electrolytes is suppressed . This is known as.

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Stark effect

Salt effect

Common ion effect

Zeman effect

Which of the following statement is not correct with reference to cell constant.

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The dimensions of cell constant is cm-1

It is used to determine the specific conductance

It is measured with KCl solution

Specific conductance does not vary with concentration.

If diesel has cetane number of 50 then the diesel index will be.

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36

46

56

66

Which of the following information is correct about a typical packed column in GC.

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10-100 m long and 2 to 6 cm to diameter

1-10 m long and 0.2 to 0.6 cm in diameter

0.1-1 m long and 0.02 to 0.00 cm in diameter

None of the above

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

Has the highest value of electronegativity

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F

Cl

Br

I

Which of the following statement is not related to applications and limitations of first law of thermodynamics.

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This law explains why chemical reactions proceed to completion

It is silent about the source of heat

It is silent about the direction of heat

It does not tell us about the reversible process.

Which of the following statements is not related with joule Thomson effect.

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Joule Thomson is 0 isenthalpic in nature

H2 and He show heating effect

All gases show change in temperature

The change in temperature depends on initial temperature and nature of the gas.

Joule Thomson coefficient is defined as meo= (op/oT)H

The branch of physics that mathematically describes the wave properties of electron in atomic is called.

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Statistical Mechanics

Quantum Mechanics

Chemical statistics

Thermodynamics

Conductometry is based on

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Electric current

Electrical potential

Absorbance

Electrical conductance

The compounds whose formation require a host compound and a guest compound are called.

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Exclusion compounds

Inclusion compounds

Crystal compounds

None of the above

A molecule is said to be chiral

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If it contains plane of symmetry

If it contains centre of symmetry

If it can be superimposed on its mirror image

None of the above

Which of the following substance act as photochemical oxidant

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Ozone

NOx

peroxyacetyl nitrate

All above

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

Which of the following statement is not correct with respect to limitations of Hammett equation.

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It is only applicable to aromatic systems

Only applicable to aliphatic systems

It is not valid for m-substituent

Which of the following polymers is chlorinated.

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Orlon

Neoprene

Dacron

None of these

Considering the elements B, Al, Mg and K , the correct order of their metallic character is.

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B > Al > Mg > K

Al > Mg > B > K

Mg > Al > K > B

K > Mg > Al > B

A considerable number of atoms pertaining to the surface_____ with the decreasing the particle size.

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Increase

Decrease

No effect

Both a and b

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