Question # 1

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 does not have an a,b, unsaturated carbonyl group.

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Androsterone

Oestrone

Testosterone

Progesterone

The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called.

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Free energy

Threshold energy

Activation energy

External energy

What prefix in steel identification means composition varies from normal limits.

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E

B

X

F

Arrangement of peptide chains of protein in spec to form helix stucture is referred to as.

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Primary structure

Secondary structure

Tertiary structure

Quaternary structure

Drying agent which react with CO2 and removes water vapours is.

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CaO

CaCl2

CaCO3

Ca(NO3)2

The most important conditions for the formation of ionic bond are.

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High ionization energy of the metallic atom and high electron affinity of the non metallic atom.

Low ionization of the metallic atom and low electron affinity of the non metallic atom.

Low ionization energy of metallic atom and high electron affinity of the non metallic atom

High ionization energy of the metallic atom and high electron affinity of non metallic atom.

In plant noise control, which of the following method is used for reducing noise

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Plant planning

Control at the source

Control of radiated noise

All above

The range of sound pressure for uncomfortable level is.

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80 - 90 dB

100 - 120 dB

130-140 dB

All above

Carbon dioxide content in atmosphere is

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0.0034%

0.034 %

0.34 %

3.4 %

Which of the following species is very good oxidizing agent.

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MnO₄

H+

Zn²⁺

Fe³⁺

Which of the following metal acts as pollutant.

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Hg

Pb

Zn

Ni

All above

Which of the following is not a component of flame photometer.

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Pressure regulator and flow meter

The atomizer

The burner

Hallow cathode lamp

According to Fajns rules, which one of following results in increased ionic nature of the covalent bond.

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Larger cation and smaller charges on anion

Larger cation and larger charge on anion

Smaller cation and smaller charge on anion

Smaller cation and larger charge on anion

Soft drinks and baby feeding bottles are generally made up

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Polyeater

Polyurethens

Polyamide

Polyetyrene

Shows a regular increase on moving down the group form carbon to lead

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Atomic volume

Atomic radius

Density

All above

Which of the following statements is false about enantiomers.

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Rotate plane of polarized light

Are superimposable mirror images

Nbonsuperimposable mirror images

All of the above

Which of the following statement is not correct regarding dissociation constant (Ka)?

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It is a measure of the tendency of an acid to split up into ions

The greater the value of Ka, more is the dissociation

It is determined by conductimetric method

It is not a proper parameter for weak acids

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

In Serpekr's process the ore is treated with which of the following.

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Carbon

Nitrogen gas

Both A and B

None of these

The vitamin which is related to monossaccharides is.

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Vitamin A

Vitamin C

Vitamin D

Vitamin E

Which of the following techniques involves the distribution of solute between two immiscible liquid phases.

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Chromatography

Electrophoresis

Solvent extractions

Solid phase extraction

Which of the following is an important aspect of industrial ecology.

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Minimising air emissions

Minimising liquid waste

Recycling after use

All above

Which one of the following statements regarding BF3 is not correct.

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It is an ionic compound

It is an electron deficient compound

It is a Lewis acid

It forms adducts

Berllium has diagonal relationship with

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Li

Al

B

Na

Beryllium shows diagonal relationship with.

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Mg

Al

Na

B

Which among the following is secondary pollutant.

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CO

CO2

PAN

Aerosol

In C4-axis of rotation, an object in rotated through an angle of.

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120^o

180^o

100 ^o

90^o

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.

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Ammonia

O2

N2

NO

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

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