Question # 1

Presence of nitrogen in organic compound to tested as.

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Nitrogen gas

NH3

NO

Amide

If Principal quantum number n = 4 the quantum number l can have calue.

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1,2,3 and 4

0,1,2 and 3

1,2 and 3 only

None of the abvoe

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Which of the following statement is not correct with respect to radioactive pollutnats.

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Carcinoma and breast cancer

Leukemia

Increases biological immune system

Somatic and generic disorder

The number of gram equivalents of the solute per dm3 of the solution is called.

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Formality

Normality

Molality

Molarity

Fluorine finds considerble use of DDFT which is used as.

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herbicide

Fungacide

Insecticide

Nomatocides

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

Which of the following pairs does not represent Lowery acid base pair.

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H2O+NH3

H2O +H2O

HCL + H2O

CH3NH2 + BF3

The shape of SO₄^2-ion is.

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Tetrahedral

Trigonal planar

Square planar

Octahedral

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

Yellow colour of the flame is observed with

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Calcium salt

Barium salt

Sodium salt

Potassium salt

Halogens are coloured because.

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They are strong oxidant

Their molecules are held together by weak van der Waals forces

Their atoms absorb radiations form visible range causing the excitation of valence electrons to higher energy of levels

Their molecules absorb light radiation forming the oxcited state.

The correct order of electron affinities of SI, P, and Cl is.

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P > Si > Cl

Cl > P > Si

Cl > Si, > P

Si > P . Cl

Bases and reducing agents are electron giving agents and also called as.

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Electrodotic

Electrophile

Nucleophile

None of above

Which of the following method is based on the solubility difference between the analyte and the unwanted components.

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Distillation

Complex formation

Electrodepostion

Precipitation

The change in the concentration of the reactant of product per units time is called.

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Order of the reaction

Melecularity of the reaction

Rate of reaction

None of the above

Refining is

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Extracting petroleum gas

Separation of various fraction

Heating of coal

All of above

The wear-resistance of the material is attributed to its ability on ________ that is the hardness is increased greatly when the steel is cold worked.

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Cold harden

Stress harden

Strain harden

Cool temperature

The variable valency is generally observed in case of.

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Transition elements

Inert gases

Normal elements

Non- metallic elements

Which group contains elements that exist as monoatomic molecules.

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1

2

14

18

Which of the following steps is involved in quantitative analysis.

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Sampling

Conversion of the desired constituent into a suitable form per analysis.

Measurement of some physical or chemicals property, on which the determination is based.

All above steps

Most electronegative element is.

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C

Si

Pb

Sn

The major role of Flurospar which is added in small quantities in the electrolytic reduction alumina dissolved in fused cryolite is.

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As a catalyst

To make the fused mixture very conducting

To lower the temperature of the melt

To decreases the rate of oxidation of carbon at the anode

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

Which of the following is a non degradable pollutant.

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Long chain phenoiics

DDT

Mercuric salts

All above

Considering the elements B, Al, Mg and K , the correct order of their metallic character is.

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B > Al > Mg > K

Al > Mg > B > K

Mg > Al > K > B

K > Mg > Al > B

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.

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

The _________ sphere is enclosed in brackets in formulas for complex species, and it includes the central metal ion plus the coordinated group

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Ligand

Donor

Coordination

Oxiation

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

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