Question # 1

Stainless steel consists of which elements.

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Fe only

Cr only

Fe and Ni

Fe ,Ni and Cr

Radon is obtained only in the radioactive decay of

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Radium

Thorium

Actinium

Any of above

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

Which of the following species has highest bond energy.

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H2

T2

D

Cl

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

The correct order of second ionization potential of carbon nitrogen, oxygen and fluorine is.

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C > N > O > F

O > F > N > C

O > N > F > C

F > O > N > C

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

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.

The most electronegative and the most electromotive elements of the first period is

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H and He

Na and Cl

Li and F

H and He

Which one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

The element with maximum first ionization energy is.

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B

N

O

C

Which of the following elements has the highest value of second ionization energy.

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Lithum

Beryllium

Boron

Magnesium

Arrhenius concept explained

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Constant heat of neutralization

Quantitative determination of acid base strength

Catalytic property of acid

All above

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

Oxalic acid when heated withe conc. H2SO4 it gives out.

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H2O and CO2

CO and CO2

CO2 and H2S

Oxalic sulphate

An equal volume mixture explodes with violence

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H2 & N2O

H2 & NO

H2 & N2O4

H2 & N2O3

Metals are

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Transparent

Tranalucant

Opaque

None of above

Ionic reactions mainly take place in.

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Aqueous solutions and organic solvents of high polarity

Non aqueous solvents of low polarity

Gaseous state

Solid state

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