Question # 1

How many varieties of commercial iron are known.

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1

2

4

3

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

Which of the following elements would have the lowest first ionization energy

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Mg

Rb

Li

Ca

Natural gas can be transported through

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Cylinders

Pipes

Barriers

All of above

Steel is an alloy of iron and carbon with limits on the amount of carbon to less than _______ percent.

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2

3

1

4

Zero group of the periodic table consists of.

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Four elements

Five elements

Six elements

Eight elements

Which of the following is capable of forming zwitter ion.

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Amino acids

Halo acids

Hydroxy acids

All of these

Complete hydrolysis of nucleotide result in the formation of.

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Heterocyclic bases

A pentose

A phosphate ion

All of these

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

Which of the following characteristics of adsorption is wrong.

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Adsorptoin on solids is reversible in nature

Adsorption, in general increase with increase in temperature.

Adsorption is generally selective in nature.

Both enthalpy and entropy of adsorption are negative

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

1-Chlorobutane on reaction with alcohols potash gives.

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1- butane

1-butanol

2- butane

2- butanol

Who prepared and explained nano tubes for the first time.

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Sumio Tijima

Richard Smaley

Erick Drexler

Richard Feynamann

A closed system is one which can exchange with surrounding.

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Matter but not energy

Energy but not matter

Both matter and energy

Neither matter nor energy

The decreasing order of the second ionization energies of K, Ca and Ba is

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K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

Which of the following statement is not correct with respect to group theory.

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Two elements of a group combine to form a third element of a group

An element combines with itself to form another element of the group.

Each element of the group obey associative law of combination

Each group element has no reciprocal

Which of the following is the second anciently known metal.

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Nickel

Copper

Gold

Silver

Which of the following statement is not related with direct use of solar energy.

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It is used for space heating of buildings

It can be used to produce electrical power using photovoltaic cells

It can be used to produce hydrogen gas

It can be used start motor vehicle

Dolmite is a mineral whose formula is.

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CaCO3

Mg CO3

CaCO3, MgCO3

CaSO4

Molecule of oxygen is

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Diamagnetic

Paramagnetic

Both A and B

None of above

An emulsifier is an agents which

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Stabilizes an emulsion

Homgeneises and emulsion

Causes coagulation of an emulsion

Helps in the formation of an emulsion

The units of coefficient of viscosity are.

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kg m-1 n-1

gm -1, s-1

kgm-1, min -1

None of the above

The angle between corresponding planes forming the external surfaces of the crystal remains constant for a given substances This is known as.

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Steno's law

Henry's law

Bragg law

Pascal law

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

In normal mode of operations of liquid liquid partition, a polar stationary phase is used with a non polar mobile phase Which of the following solvent is used as mobile phase.

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Ethanol

Propanol

Butanol

Hexane

Which of the following properties are not related to an atom.

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An atom consists of two basic parts , a nucleus and one or more electons.

The nucleus is the central core of an atom

An electron is a heavy and negatively charged particle.

The nucleus itself consiste of two particles.

Arrange the hydrides group 15 in the order of increasing boiling point.

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PH3 < AsH3 <SbH3 < BiH3 <NH3

PH3 <AsH3< SbH3< NH3 < BiH3

PH3 < AsH3<NH3 <SbH3<BiH3

NH3 < PH3 < AsH3 < Sb H3 < BiH3

All bond length in benzene are identical due to.

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Resonance effect

Inductomeric effect

Electromeric effect

Mesomeric effect

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

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