Question # 1

Which of the following is not a correct postulate of the kinetic theory of gases.

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The molecules are in random motion

The gaseous collisions are perfectly elastic

The average kinetic energies of different gases are equal at a particular temperature.

The pressure exerted on the walls of the container is due to inter molecular forces.

Which treatment is done with pulp before delivering it to paper making machine.

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Pulp is disperse din water to make slurry

Mechanical refining or heating of the fibers

Addition of chemical additives and recycled fibres from the waste paper plant

All above

Bryllium salts on hydrolysis give.

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Basic solutions

Acidic solutions

Neutral solutions

Amphoteric solutions.

Un-like s -block elements d-block elements form which compounds as well

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ionic compounds

Co valent compound

Co ordinate compounds

None of above

What combination of elements has high electrical resistance high corrosion resistance, and high strength at red hear temperatures, making it useful in resistance heating.

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Aluminium bronze

Nichrome

Hastelloy

None of above

The relative populations of gourd state and excited state populations at a given flame temperature can be estimated using.

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Boltzmann distribution law

Maxwell law

Lambertie law

Beer's law

Brass is an alloy of

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Copper and tin

Copper and zinc

Aluminium and nickel

Leed and tin

Which of the following is not a naturally occurring dye.

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Indogo

Indigotin

Alizarin

Malachite green

The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called.

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Halides

Hydrates

Clathrates

All of above

The glow of yellow phosphorous as is result of slow oxidation in air is called.

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Luminescence

Bioluminescence

Photolysis

Chemiluminescene

The entropy change accompanying any physical or chemical transformation approaches zero as T approaches zero. This statement refers to.

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Helmholtz law

Third law of thermodynamics

Second law of thermodynamics

Nernat heat theorem

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

Which of the following item is not symmetry element.

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Pllane of symmetry

Inversion centre

Improper rotation

Optical activity

Which of the following solution has highest normality.

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1 N H2PO4

0.5 N H2SO4

6 g NaOH per 100 cm3

4 g NaOH PER 1000 cm3

It has been observed that if one goes on adding KNO3 solution to a precipitate of AgCl the solubility of these precipitates goes on increasing with increasing concentration of K+ and NO3= ions which are not common to AgCl This is due to which effect.

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Divers ion effect

Uncommon ion effect

Activity effect

All above

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

The percentage of s-character in the hybrid orbitals sp, sp2 and sp3 follows the pattern.

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sp3 > sp2 > sp

sp > sp2 > sp3

sp = sp2 >sp3

sp = sp2 =sp3

The magnetic quantum number (m) specifies the individual orbital in a Sub shell for a given l, m can be.

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l,l- l........-1

l........2, l -3.......-2l

l-l-2,..........-l

l-2,l-4, ............-4l

Metal crystallize is system having co ordination number

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8

12

14

any one of above

The diameter of hydrogen atom is.______________nm

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10

1

0.1

0.01

In B2H6 molecule

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There exists a direct B-B a -bond

All the atoms are in one plane

All the B-H bonds are normal covalent bonds

There exist two bonds between the boron atoms.

Biomass refers to all the organic material derived from

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Photolysis

Photosynthesis

Electrolysis

Oxidation

The chief ore of aluminium is.

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Cryolite

Bauxite

Kaolin

Carnalite

Which of the following is class of nanorods

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metals

alloys

Metal oxide and Metal sulphite

All of the above

Which of the following in not a characteristics of crystalline solids.

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Sharp melting point

Isotropic

Long range orderly arrangemnt

None of above

Which of the following symmetry element leaves the molecule or an object unchanged.

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Proper rotation

Improper rotation

Inversion axis

Identity

Which of the following alloys contains Cu and Zn

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Bronze

Brass

Gun metal

Type metal

Which of the following orbitals does not make sense.

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6f

4f

7s

2d

The most stable oxidation state of chromium is.

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+6

+3

+4

+2

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

Maximum desirable concentration of fluorides according to international standard is.

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10-100 ppm

1 ppm

100-200 ppm

10-20 ppm

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