Question # 1

In the Mendeleev's periodic table elements are arranged in the increasing order of their .

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Numbers of neutrone.

Atomic number

Atomic mass

Atomic volume

The number of bonds formed by the central atom is called its.

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Valence number

Complex number

Coordination number

Avogadro's number

What is a method of casehardening involving diffusion in which the steel to be casehardened is machined, heat treated placed in an air tight box and heated to about 1000 ^oF

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Annealing

Normalizing

Carburizing

Decomposition

CFT was originally applied to.

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Ionic crystal

Liquid crystal

Solid crystal

All above

Essential oils are purified by which of the following methods.

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Steam distillation

Sublimation

Crystallization

Fractional crystallization

Pick out the incorrect statement for SO2

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It turns filter paper moistened with acidified K2Cr2O7

It turns starch iodate paper blue

It does not react with chlorine in presence of charcoal

It decolourises acidified KMnO4 solution.

The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is.

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Gentain violet

Megneta

Phenolphthalein

Rosolic acid

Boron and aluminum halides are electron deficient compounds in this respect. they act as.

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Lewis acid

Lewis base

Oxidizing agent

Reducing agent

The fertilizers which provide single nutrient from NPK are called _______ fertilizer

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Straight

compound

Both A and b

None of above

One arm of each t-RNA terminates in the base sequence.

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UGU

GGC

ACT

CCA

Which of the following technique involves the bonding of hydrophobic functional group to solid particle, surface and acts as extracting phase

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Liquid phase extraction

Solid phase extraction

Electrophoresis

Gel electrophoresis

A major constituent of materials one whose amount in the materials is

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1% or more

0.1%

0.01%

0.001 %

Major ingredients of traditional ceramics

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Silica

Clay

Feldspar

All

When HCl is titrated against NaOH , the pH at the equivalence point is.

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zero

> 7

< 7

14

Orion is polymer of.

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Styrene

CF2 = CF2

Vinyl chloride

Acrylontrile

Which type of elements form ionic hydrides.

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Transitionelements

Metalloids

Elements with high electronegativity

Elements with high electropositivity.

20 micron =____________________ nm

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20 x10^-9

20000

200

20x10⁹

What element is added to copper to increase its strength and fatigue propertioes.

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Silicon

Aluminium

Beryllium

Copper

What group of steels are molybdenum high sped steels.

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Group A

Group D

Group M

Group H

Which of the following is a thermometric method.

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TGA

DTA

DTG

All

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 entropy of the universe

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Tends towards a maximum

Tend towards a maximum

Tends to be zero

Remains constatn

Albumin is classified as

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Simple protein

Conjugated protein

Lipoprotein

Derived protein

Which of the following hydrocarbon cannot be obtained on reacting chloomethane with sodium metal in the presence of dry ether.

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C4 H10

C2H6

C2H4

C3H8

Which of the following is not an alkali metal

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Rb

Sb

Cs

Fr

The atomic number of potassium is 19 and that of mangness is 25 Although the colour of MnO4 is dark violet yet the K+ is colourless this is due to the fact that.

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Mn is a transition element while K+ is not

[MnO4]- is negatively charged while K+ has positive charge

The effective atomic number of Mn is [MnO4]- is 26: while for K+ the atomic number is 18

The Mn is a high positive oxidation state allows charge transfer transitions.

Environmental pollution refers to.

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Peeling of top soil

Dissipation of energy

Release of toxic materials in environment

None of the above

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

The correct order of acidic strength is.

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HF < HCl< HI < HBr

HI <HBr < HCl < HF

HI < HBr < HF < HCl

HF < HCl < HBr < HI

Zero group elements are called as

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Inert gases

Rare gases

Noble gases

All of above

Rectified spirit obtained by formentation contains 5% of water .So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated Benzene helps because.

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It is dehydreating agent and so removes water

It forms the loweer layer which retains all the water so that alcohol can be distilled off

It form an azeotropic mixture having high boiling point and thus allows the alcohol to distall over

It forms low boiling azeotropic mixture which distille over leaving behind pure alcohol which can than be distilled.

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