Question # 1

The maximum covalence of an element equal to.

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The number of unpaired d electrons

The number of paired p electrons

The number of unpaired a and P electors

The actual number of a and P electrons in the outermost shell

Which of the following elements of group 15 is a typical metal.

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P

As

Bi

Sb

All halogens exist as covalent molecules.

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Monoatomic

Daitomic

Triatonic

Tetra atomic

Law of octaves was proposed by

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Lother meyer

D.I.Mendeleev

J.A.R. Newlands

J.W. Dobereiner

Which of the following analytical techniques can be used to extract metal ion chelates.

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Solvent extractions

Evaporation

GC

Distillation

The osmotic pressure of a solution with definite composition.

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Varies directly as the volume and temperature.

Various inversely as the temperature.

Varies inversely as the volume and directly as the temperature.

None of the above

Result of ozone hole is.

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Acid rain

Global warming

Increased amount of CO2

Greater exposure of earth to U.V. rays.

The number of mole of the solute dissolved per dm3 of the solution is called.

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Molality

Formality

Normality

Molarity

Dyes which can be applied to cellulosic fibre from water solution are called.

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Ingrain dyes

Substantive dyes

Mordant dyes

Vat dyes

What is a measure of rigidity?

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Stiffiness

Jardmess

Strength

Modulus of elasticity

When rain is accompanied by a thunderstorm, the collected rain water will have pH

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Slightly lower than that of rain water without thunderatorm

Slightly higher than that of rain water without thunderastorm

Uninfluenced by occurrence of thunderatorm

Which depends on amount of dust in air

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Which of the following salt is not used in salt bridge to minimize liquids junction potential.

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KCl

NH4Cl

KNO3

CaCl2

Which ionization Potential in the following equations involves the greatest amount of energy.

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Na = Na+ + e

K = K+ +e

C2+ = C3+ +e

Ca+ = Ca2+ + e

The electrolytic method super passes all other methods due to.

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Furity

Cheapness

Easy available

All above

The elements with highest electron affinity belongs to.

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Period 2 , group 17

Period 3, group 17

Period 2, group 18

Period, 2 , group 1

Which of the following is major sink for carbo monoxide.

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Water

Soil

Animal respiration

Salts dissolved in ocean water

Nitric acid is used in manufacturing of.

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Explosive

H2SO4

Fertilizer

All above

Which of the following statement is incorrect.

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An alloy is a mixture of two or more metals

An alloy is a mixture of two or more metal and non metal elements that have metallic properties

An alloy has a fixed composition

An amalgam is an alloy containing Hg

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

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Anionic

Cationic

Nonionic

Neutral

The magnitude of electron affinity depends on.

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Atomic size

Nuclear charge

Electronic configuration

All of the above

During sintering densification is not due to

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Atomic diffusion

Surface diffusion

Bulk diffusion

Surface tenstion

Which of the following elements display maximum tnedency to form P Pi - p PI multiple bonds with itself and with carbon and oxygen.

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N

p

Bi

As

The basic strength of hydrides of group 15 elements very in the following order.

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NH3 > PH3 > AsH3 > SbH3 >BiH3

PH3 > NH3 > AsH3> SbH3 > BiH3

BiH3> NH3 >PH3 > AsH3 > SbH3

NH3 > PH3 > SbH3 > AsH3 > BiH3

Which of the following elements forms maximum number of compounds.

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Carbon

Silicon

Hydrogen

Fluorine

The unit of specific conductance will be

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S cm-1

Ohm cm

Ohm cm-1

Mho cm

A mixture containing S2- and SO4 ions on trating with dil HCl will produce

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H2S gas

SO2 gas

H2S and SO2 gas

CO

Which of the following is an allotrops of hydrogen.

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0- H2

P-H2

Both A and B

None of these

Which of the following statement is not correct regarding the stern theory of charge on colloidal particles.

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The colloidal particle has a charge distribution at its surface.

In the immediate vicinity of the colloidal particles there is an excess of counter ions

The greater the concentration and charge of ions in the diffused electrical double layer. the larger is the thickness of the layer

At large distance from the colloidal particles, the concentration of co-ions and counter ions are almost equal

Which of the following test is not shown by proteins.

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Xanthoproten test

Ninhydrin test

Hopkin cole test

Muliken Barker test

For the respiration of sea divers mixture is used.

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He & O2

Ar & O2

Ne & O2

Kr & O2

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