Question # 1

The expected specific wastes of textile industry is

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Cloth residue

Fibre residue

Dyes

All above

Turpentine is obtained from._______________

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Oak tree

Pine tree

Birch tree

Lemon tree

Which of the following is the cause of Brownian movement of colloidal particles.

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Convection currents int he fluid

Bombardment by the molecules of the dispersion medium

Setting of dispersed phase under gravity.

Thermal gradient in the medium

Isotopes are atoms whom nuclei have the same atomic number but different mass numbers. A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom.

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17

18

34

35

Orion is polymer of.

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Styrene

CF2 = CF2

Vinyl chloride

Acrylontrile

The molarity of a 500 mL solution containing 4 g NaOH

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0.1

0.2

0.3

0.4

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

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

Which of the following statements is not a part of Bohr's theory of the hydrogen atom.

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An electron in an atom revolves aroung the nucleus only in circular paths.

An electron does not absorb energy in the stationary orbit

An electron does not emit energy in the stationary orbit

Energy is emitted or absorbed in a discrete amount from the stationary orbit

For an average exposure of 8 hours per day, the maximum permissible concentration limit of CO in the atmosphere is.

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50 ppm

500 ppm

10³ ppm

20 ppm

Green houses are responsible for keeping our plant warm and sustaining life on the earth.

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CO2 & water vapours

CO2 & CFC

CO2 & H2O

CO2 & CH4

Which of the following item is not symmetry element.

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Pllane of symmetry

Inversion centre

Improper rotation

Optical activity

Conductometry is based on

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Electric current

Electrical potential

Absorbance

Electrical conductance

The range of sound pressure for uncomfortable level is.

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80 - 90 dB

100 - 120 dB

130-140 dB

All above

The correct order of ionization energies of alkali metals is.

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Li > Na > K > Rb

Na > K > Rb > Li

Rb > K > Na > Li

Rb > K > Li > Na

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

Helium is used in weather balloons and airships instead of H2 becuse it is.

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Lighter than hydrogen

Incombustible

More abundant than hydrogen

Radiactive

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

Which of the flowing operator combination would yield eight value equation

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d/x (sin x)

d/dx (cos x)

d /dx (sin 4x)

d /dx (cos 4x)

d/dx (e^x)

The formula of bleaching powder is.

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Ca OCl2

CaCIO3

Ca(CIO)3)2

CaOCI

Used in TV sets and sound movies to give ready response to electrical potential

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He

Ne

Ar

Kr

Which of the following is not a component of a gas chromatography system.

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Carrier gas

Capillary column

Packed column

Cathode lamp

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

The process requirieng the absorption of energy of.

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F = F

Cl = Cl

H = H

O = O

Identify a dye which was ot originally obtained from plant source.

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Alizarin

Tyrian purple

Indigotin

Quercitrin

Enantiomers have which of the following characteristics.

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Rotate ordinary light

Have the same melting point

Are superimposable mirror images

React with optically active molecule at the same rate

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

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

Which of the following is not a characteristic of dye.

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It must have suitable colour

It must be able to fix to fibre

It must be fast to wash and lights

It must be highly soluble in water

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

Low quality steels with an M. Suffix on the designation intended for non structural application is classified as.

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Merchant quality

Commercial quality

Drawing quality

Low quality

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