Question # 1

When 0.01 moles of NaOH are added to a buffer solution, its pH changes from 4.745 to 4.832 WHAT IS ITS.

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0.115

0.900

0.015

0.215

The number of hydrogen bond present in G -C pair is

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1

2

4

3

A gas obeying the van Waals equation will closely resemble and ideal gas if

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The parameters 'a' and 'b' are small

'a' is small but 'b' is large

'a' is large but 'b' is mall

None of the above

Which of the following is atmospheric pollutant.

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CO2

CO

O2

N2

The bond order gives the following valuable information.

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Stability of the molecules of ions

Bond dissociation energy and bond length

Magnetic properties

All of the above

The tensile strength of a carbon nanotube is __________ times that of steel.

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10

25

100

1000

What refers to a shape achieved by allowing a liquid to solidify in a mold.

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Casting

Molding

Forming

All of the choices

Sodium metal cannot be stored under

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Hexane

Benzene

Kerosene

Ethanol

Which of the following statements is NOT true .

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About 10% of the earth's crust is iron

Pure iron does not have significant industrial use because it is too weak and soft.

Steel in an alloy of carbon and iron with limits on the amount of carbon

None of above

Which of the following statement is not related with industrial ecology.

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Study of interactions between human activities and its environment

Industrial ecology seeks to optimize the total industrial materials cycle from virgin material to finished product

Industrial impacts on the environment

Economic system are viewed in isolating from their surrounding

Pick out incorrect statement regarding HF

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It is used for making chlorofluorocarbon used as refrigerating fluids and as propellants in aerosols

It is used in making ASIF3 and synthetic cryolite

Aqueous HF is used for etchine glass

HF does not react with B2O3 even in presence of conc. H2SO4

Which is the following is not a buffer.

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H2CO3/HCO3

NH4Cl/NH4OH

CH3COOH/CH3COONa

NH3OH/CH3COOH

Which of the following is diamagnetic

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O2

O2+

O2-

O2 ^2-

Which of the following statements is wrong.

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Covenant compounds are generally soluble is polar solvents.

Covalent compounds have low melting and boiling points

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H

Monomer of natural rubber is

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1,3-Butadiene

2-Methyl -1,3-butadiene

1,2 -Butadiene

1,3 - Pentadiene

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

The different layers in graphite are held together by

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Ionic bonding

Metallic bonding

Covalent bonding

Van der Waals forces

Among sodium phosphate, sodium sulphate and sodium chloride the solubility in water increases as.

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Chloride > Phosphate > Sulphate

Sulphate > Pohosphate> Chloride

Chloride > Sulphate > Phosphate

Phosphate > Chloride > Sulphate

In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.

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Ammonia

O2

N2

NO

The following alloys are the chief alloys that are die cast except.

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Zinc alloys

Magnesium alloys

Manganese alloys

Nickel alloys

The unit of specific conductance will be

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S cm-1

Ohm cm

Ohm cm-1

Mho cm

When the concentration of reactant molecules is increased the rate of reaction increases. The best explanation is As the reactant concentration increases.

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The average kinetic energy of molecules increases.

The frequency of molecular collisions increases

The rate constant increase

The activation energy increases

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

Which of the following cast iron is heat treated for ductility.

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Gray iron

Malleable iron

White iron

None of these

Which of the following is a planar molecule.

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Acetone

Formic acid

Acetic acid

All above

The juice is allowed to boil at lower temperatures to protect the sugar from

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Hardening

Solubility in water

Caramelization

Dwatering

Oxidative enzymes are responsible for

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Biological processes

Biological oxidation

Biological hydrolysis

Biological isomerisation

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

Which of the following is an example of molecular solids.

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MgO

ZnO

Ice

Graphite

What is the most common alloying ingredient in copper?

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Brass

Zinc

Cobalt

Nickle

Which of the following statement is not related with nitric oxide.

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It is a colorless and odourless gas

It is produced largely by fuel combustion

It is a brown pungent gas

It is oxidized to NO2

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