Question # 1

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

Which of the following technique is used for separation of volatile components.

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GC

HPLC

FPLC

TLC

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

What term is used to denote a family of thermosetting polymers that are reaction products of alcohols and acids.

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Alkaline

Alkydes

Alcocide

Ketones

Which of the following dye is used an antiseptic .

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Methyl orange

Mercurochrome

Alizarin

Bismarck brown

The nitrogen present in some fertilizers helps plants.

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To fight against diseases

To undergo photosynthesis

To produce protein

Which of the following elements has the highest third ionization energy.

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Sodium

Magnesium

Aluminum

Silicon

A mordants is substance which in

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Coloured

Leuco -base of a dye

Fixes dye on the fabric

All of these

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

Aluminium does not corrode as does iron because.

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AI does not react with O2

a-protective layer of Al2O3 forms on the metal surface

AI is harder to oxidize than is Fe

Fe gives chathodic protection to AI

Plane polarized light is affected by

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Identical molecules

All polymers

Chiral molecules

All biomolecules

Which of the following statement is not relevant with nitrous oxide.

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It is a colorless and odourless gas

It is non toxic gas

It is present in the atmosphere in higher concentration

It has high reactivity in the lower atmosphere

The fertilizers which provide single nutrient from NPK are called _______ fertilizer

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Straight

compound

Both A and b

None of above

Rutherford proposed the nuclear model of the atom to account for the result of experiments in which the alpha particles are scattered from metal foils.Which of the following statements in not related to Rutherford observation.

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An atom consists of central core or nucleus around which the protons exist.

The nucleus has most of the mass of the atom

the nucleus consists of protons and neutrons.

Each distinct atom has a specific number of protons.

In emulsions , the dispersed phase and the dispersion medium are.

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Both solids

Both liquids

Both gases

Phase is liquid and medium is solid.

What refers to the tin mill steel, without a coating.

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White plate

Black plate

Tin steel free

Dichromate tin

___________ surfactants perform well over a wide range of water hardness and pH.

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Anionic

Cationic

Nonionic

Neutral

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

Granulated sugar contains _____________% sucrose

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80

99.30

60

90

The formula of sulphur sequioxide

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SO4

S2O7

S2O3

SO3

The substance added to the soil in very small amounts are called.

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Macronutrients

Micronutrients

Fertilizers

None of these

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

CFSE for d⁷ ion is.

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0.8

-0.8

-1.8

1.8

J.J. Thomson established certain properties about cathode rays. Which of the following is not related to cathode rays.

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Cathode rays from a gas discharge tube consists of negatively charged particles

Cathode rays are called electrons.

The e/m ratio of cathode rays depends on the gas inside

Cathode rays are affected by electric and magnetic fields.

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

The exchange equilibrium in gas chromatography depends on.

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Solubility or absorbability of he sample

The polarity of he stationary phase and analyte

The degree of H bonding

All above factors

Which of the following factors does not effect the rate of the reaction.

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Pressure

Temperature

Concentration

Catalyst

All of the above

Solid sodium chloride does not conduct electricity be cause.

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In solid NaCl, no ions are present

Solid NaCl is covalent in nature

In solid NaCl, there is no mobility of ions

In solid NaCl, there are no electrons.

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