Question # 1

The group H steels can be used n what temperature range.

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600^oC to 1100 ^oC

1000 ^oC to 1500 ^oC

1100 ^oC to 2000 ^oC

200 ^oC to 800 ^oC

The flow of solvent into a solution when two are separated by a semi -permeable membrane is called.

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Mixing

Effusion

Diffusion

Osmosis

Transition elements, in general exhibit the following properties, except one Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

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.

The rising world temperature will have serious effect on.

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Agriculture

Animal production

Human being

All above

The deficiency of which vitamin leads to beri brainteaser

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Thiamine

Riboflavin

Pyridoxine

Asorbic acid

The internal resistance to flow possessed by a liquid is called its.

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Fluidity

Viscosity

Surface tension

Turbidity

Peeling of ozone umbrella is due to.

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CFCa

PAN

CO2

Coal burning

An organic liquid (X) containing C, H and H has a pleasent odour with a boiling point of 78 oC. On boiling X with conc. H2SO4 a colourless gas is produced which decolourless bromine water and alkaline KMnO4 One mole of this gas also takes one mole of H2. The organic liquid (X) is.

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n-C3H7OH

iso-C3H7OH

C2H5CHO

CH3CH2OH

Arrange the hydrides of group 15 in the correct order of reducing nature.

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NH3 < PH3 < AsH3 < Sb H3 < BiH3

NH3 > PH3 >AsH3 >Sb H3 > BiH3

PH3 < AsH3 < SbH3 < BiH3 < NH3

PH3 > AsH3 > SbH3 > BiH3 > NH3

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

Most commercial glasses consist of

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Lime

Soda

Silica

All

Which of the following is not correct.

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Rusting of iron can be stopped by increasing the concentration of CO2 in water

Rusting of iron is electrochemical in nature.

Rusting of iron takes place in moist air

Rusting of iron produces hydrated iron (III) oxide

Which of the following process is a source of nuclear pollution.

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Uranium mining

Uranium processing

Reactor waste

All above

Nitrogen (N2)) is relatively unreactive because.

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Its electronegativity is high

Its dissociation energy is large

Its atomic radius is small

It is the first element of group 15

Bond angle is minimum in

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H2O

CO2

NH3

CH4

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

The formula of Tetraboric acid is.

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H2BO3

HBO2

H2B4O7

H6B4O9

In the presence of dilute alkali monosaccharides undergo reversible isomerisation . The reaction known as.

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Kiliani reaction

Weermann rearrrangement

Lobry do Bruyn Van Ekenstein rearrangement

Mutarotation

Which of the following is a buffer solution.

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CH3COOH + NH4OH

CH3 COOH + HCl

CH3COOH + NaOH

CH3COOH + CH3COONa

Which of the following colligative properties can be used to characterize colloidal particles.

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Lowering in vapour pressure

Elevation in boiling point

Depression in freezing point

Osmotic pressure

Which of the following analytical technique is based on the emission of light radiation.

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Flame photometry

Atomic absorption spectrophotometry

Raman spectroscopy

Conductometry

Which of the following process is used for the removal of particulates.

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Wet removal by precipitation

Sedimentation

Diffusion and impaction

All above

Metals are

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Transparent

Tranalucant

Opaque

None of above

Which of the following statements correct regarding copper.

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It is used in electroplating

Its salts are used as insecticides

Its salts are used as coloring materials

All are correct

Fish die in water bodies polluted by sewage due to.

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Pathogens

Clogging of gills by silt

Reduction in dissolved oxygen

Foul smell

When Phosphate rock Ca3(PO4) 2 is converted to phosphorus.

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One of the products of the reaction is water

Sulphuric acid is added to generate insoluble calcium sulphate

Hydrogen is used to reduce the phosphate to phosphorus

Silica is added to form a calcium silicate slag

Which of the following iso -electronic ion would require least energy for the removal of electron.

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Ca2+

Cl-

Ar-

K+

The use of acids to remove oxides and acids on hot worked steels is known as

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Tempering

Picking

Machining

Sizing

Molecule is a diatomic

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Nitrogen

Phosphorous

Arsenic

Antimony

Which of the following phenomena is not explained by the classical mechanics.

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Black body radiation

Photoelectric effect

Atomic and molecular spectra

Heat capacities of solids

All of the above

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