Question # 1

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimer

Macromer

The fiber which is made from acrylonitrile as monomers:

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PVC

rayon fiber

acrylic fiber

Polyester fiber

Lind's ,method for liquefaction of gases is based on the principle of:

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Graham's law of diffusion

Joule Thomson effect

Avogadro's hypothesis

Dalton's law of partial pressure

Benzene reacts with Ethyl chloride in presence of AICls to give

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Benzalchloride

Benzyl chloride

Ethyl benzene

Benzotrichloride

Separation of low molecular weight protein from high one is

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Dialysis

Cromotography

Electrophoiesis

Ultracentrifugation

Amides are

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Strongly basic

Weakly basic

Acidic

Strongly

Which of these polymers is a synthetic polymer

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Animal fat

Strach

Cellulose

Polyester

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Exothermic

Endothermic

Exothermic and fast

How many CI^- ions are there around Na+ ion in NaCI crystal?

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3

4

6

8

In graphite crystal, carbon is

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sp hybridized

sp²hybridized

sp³hybridized

None

Which of these polymers is an addition polymer?

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Nylon-6,6

Polystyrene

Terylene

Epoxy resin

LiOH ______ soluble than NaOH

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More soluble

Less soluble

Equally soluble

None

What mass of NaOH is required to prepare 2.5 dm³of 1.5 M NaOH solution

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130 g

140 g

150 g

160 g

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

Direct conversion of solid intro vapours is called:

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Crystallization

Sublimation

Obligation

Vapourization

Alkyl halides on treatment with Zn and HCI gives

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Alkanes

Alkenes

Alkynes

Alcohols

Silk is an example of

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Animal fiber

Vegetable fibre

Mineral fibre

None of these

SO₂and NO₂produce pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

From the following values of dissociation constants of four acids which value represents the strongest acid?

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2 x 10^-2

0.02 x 10^-1

3 x 10^-4

2 x 10^-4

Which of the following metals is sometimes found in native state in nature?

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Al

Cu

Fe

Mg

The elimination of HX from adjacent carbon atoms is called

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Halogenations

Hydrohalogenation

Dehydrohalogenation

Hydration

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