Question # 1

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

A^o or 10 Dq is called crystal field.

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Energy

Splitting energy

Stabilization energy

None of above

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

Which of the following specie is stronger acid than formic acid, HCOOH, in aqueous solution.

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CH3COOH

NH+4

H2SO-3

H4P2O7

The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.

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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.

The phenylamine molecule is too large to capture hydrogen ion easily

Phenylamine is much less soluble is water than is ammonia

The benzene ring has a tendency to increase the acidity of its substituents.

The nature of bonds in compounds of carbon and silicon is mostly

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Covalent

Electrovalent

Metallic

Both A and B

The noble gases are used due to having property

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Chomical inertness

Low boiling point

Any of a or b

Both a and b

The isoelectric point of a protein or amino acid to.

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pH at which it does not have any charge

pH at which it does not have not charge and does not migrate in electric field

pH at which the concentration of cation is greater than amino

pH at which the concentration of anion is greater than cation

Which of the following is not a polysaccharide

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Cellobiose

Cellulose

Insulin

Amylase

The hybridization of sulphur in sulphur dioxide is.

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sp

sp2

sp3

dsp2

Oil of turpentine contains.

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a-pinene

p- pinene

Both A and B

None of these

Which of the following statement is not true with respect to electrode potential.

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Feasibility of a chemicals reaction

Rate of chemical reaction

Nature of a chemical reaction

Free energy of a chemical reaction

The equivalent conductance (^) and molar conductance ( ^ m ) of BaSO4 are related as.

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^ = ^m/2

^/2 = ^m

^ = ^m

^ = ^m/4

Which of the following exists as polymeric chains in solid state.

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

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

Which of the following substance acts as gaseous pollutant.

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NO

NO2

CO

SO2

All above

Which isotope of hydrogen is radioactive in nature.

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Protium and deuterium

Tritium only

Tritium and deuterium

Only deuterium

When some quantity of electricity is passed though two electrolytic cells. The ratio of the mass of the products obtained at the cathode is the same as the ratio of their

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Densities

Atomic masses

Equivalent masses

Atomic numbers

Trimethylamine is a weaker base than dimethylamine is explained by

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Steric effct

Resonance effect

Inductive effect

All above

Which of the following energy is trapped by the autotrophic organisms.

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Mechanical energy

Electrical energy

Radiant energy

Electronic energy

Ionic reactions mainly take place in.

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Aqueous solutions and organic solvents of high polarity

Non aqueous solvents of low polarity

Gaseous state

Solid state

Which of the following device is used to measure the surface tension.

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Polarimeter

Viscometer

Refractometer

Stalagnameter

Long diseases are about four times more in urban areas as compared to rural areas. This is due to the presence of which of the following. in atmosphere.

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CO2

NO2

O2

N2

Hydrometallurgy of copper involves extraction of copper from poor ores by which process.

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Dry process

Wet process

Both dry and wet process

None 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

The correct order of second ionization potential of carbon nitrogen, oxygen and fluorine is.

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C > N > O > F

O > F > N > C

O > N > F > C

F > O > N > C

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

Which is not a pollutant from the exhaust of motor.

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Hydrocarbons

Carbon monoxide

NOx

Fly ash

Metal crystallize is system having co ordination number

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8

12

14

any one of above

The separation efficiency of a column can be expressed in terms of number of.

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Solvents used

Theoretical plates

Stationary phases

Mobile phases

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