Question # 1

What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)

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10.33 atm

9.333 atm

9.74 atm

9.2 atm

Water may boil at 170C when external pressure is

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760 torr

170 torr

2115 torr

700 torr

Which of the following reagents reaet in same manner with HCHO, CH3CHO andCH3COCH3

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HCN

Cu2(OH)2/ NaOH

Ammonical AgNO3

Cu(OH)2 only

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

The relationship between volume of a given amount of gas and prevailing conditions of temperature and pressure are:

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Charle's law

Graham's law

Boyle's law

Gas laws

An ideal gas cannot be liquefied because:

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It solidify before becoming a liquid

Its critical temperature is always above 0^oC

It is molecule are relatively smaller in size.

Forces operative between its molecules are negligible

An excess af silver nitrate is added to the aqueous barium chloride and the precipitate is removed by filtration. What are the main ions in the filtrate?

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Ag+ and NO3-, only

NO3- and Ba+2 only

Ag+ and NO-3, and Ba+2 only

CI- and NO-3, and Ba+2 only

Liquid hydrocarbon is

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methane

propane

ethane

hexane

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

The pressure exerted by gas molecules is due to their

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collisions

densities

masses

kinetic energy

The total number of lattice arrangements in different crystal system is

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7.0

3.0

8.0

14

Which of the followings has electronic configuration of Ar in +3 oxidation state

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Sc

Mn

Ti

Zn

lce occupies more space than liquid water

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9%

10%

11%

12%

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

When vapour pressure is equal to atmospheric pressure than it is called

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Evaporation

M.P

B.P

Freezing point

Vapour pressure of a liquid

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increasing with increase of temperature

increases with decrease of temperature

increases with size of container

increases with volume of liquid

The forces present between the ions and water molecules are called:

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dipole-dipole forces

dipole-induced dipole forces

London dispersion forces

ion-dipole forces

Which one of the following gases has lowest density at room temperature:

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NH₃

Ne

N₂

CO

Which of the following statements is not correct about galvanic cell?

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Anode is negatively charged

Cathode is positively charged

Reduction occurs at anode

Reduction occurs at cathode

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

Which of the elements has seven electrons in d-subshell?

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Zn

Co

Cu

Fe

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

By the electrolysis of CuCl2 using inert electrodes of platinum which species is deposited at cathode

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H2

O2

Cu

CI

The mono atomic gases are

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Halogens

Noble gases

6h group elements

Nitrogen and oxygen

In crystal structure of sodium chloride,the arrangement of CI^- ions is

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Fcc

Both fcc and bcc

Bcc

None of these

Which pair of elements will have the same type of bonds between their atoms in the solid state?

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carbon and calcium

lithium and boron

aluminium and phosphorus

nitrogen and carbon

The reaction which is zero order

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Decomposition ofN2O5

Formation of Glucose in plant

Formation of Fel2

Chorination of methane in sunlight

The molar volume of CO₂ is maximum at:

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S.T.P. (0^∘C and 1 atm)

127^∘C and 1 atm

0^∘C and 2 atm

273^∘C 2atm

Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous

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Ethanol

Water

lodine

Ethane

Which one of the following is NOT a nucleophile

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NH2+

BF3

H2O

CH3-

Which of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

Observed pressure of gas on the walls of container is less than actual pressure due to

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Hephazard motion

Inter molecular attractive forces

Elastic collision

Repulsive forces

A certain buffer solution contains equal cone. of X- and HX. Ka for HX is 10(-8). The pH of buffer is

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3

11

8

14

A substances has M_r74.5, a melting point of 772°C and a boiling point of 1407°C. It conducts electricity only when in the liquid state.What is the bonding present in this substances?

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covalent

ionic

metallic

hydrogen bonding

In homocyclic compounds the ring consists of

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Carbon and oxygen atoms

Carbon and nitrogen atoms

Only carbon atoms

Carbon atoms with one hetero atom

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

.The number of moles in 2.24 dm3 of H2 gas at STP is:

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1

0.1

10

0.01

The sun is a ball of plasma heated by nuclear fusion is

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1.0 million km

2.0 million km

1.5 million km

2.5 million km

The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is

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10

1

4

2

The typical range of the H-bonding is:

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1-2 kj/mol of bonds

5-25 kj/mol of bonds

500 kj/mol of bonds

A real gas obeying Vander Waal's equation will resemble ideal gas if

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Both a and b are large

Both a and b are small

a is small and b is large

a is large and b is small

The volume of 2.8 g of CO at 27°C and 0.0821 atm is

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30 dm³

3 dm³

0.3 dm³

1.5 dm³

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

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same as that of a hydrogen molecule

half that of a hydrogen molecule

two times that of a hydrogen molecule

four times that of hydrogen molecule

The order of reaction provides valuable information about of reaction

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Condition

Concentration

Mechanism

Parameters

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

One dm3 of H2 and O2: has different masses but no. of particles are

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same

H2 has greater

different

O2 has greater

Which one of the following elements is most electropositive out of group I -A and II-A group?

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K

Mg

Na

Ca

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

Reaction kinetics is important to discover the---under which reaction will proceed most economically:

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rate constant

Conditions

volume

equilibrium point

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

Considering the physical properties of the gases, which of the following statements about particles of gas is not true. The particles

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orderly arranged

randomly moving

having wide spaces

causing pressure

Which of the substance is not going to react the sodium metal:

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Acetic acid

Methanol

Di methyl ether

Ethanol

Which of the following compounds does not exhibit positional isomerism?

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Alkynes

Nitroalkanes

Carboxylic acid

Alcohol

Which of the following solid is amorphous

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NaCl

diamond

glass

MgO

The total K.E. of one mole of an ideal gas is given by:

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1/2 RT

3/2 RT

1/2 KT

3/2 KT

In intense electrical field and at a very high temperature matter generally exist in

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Solid state

Plasma state

Liquid state

Gaseous state

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

According to the general gas equation, density of an ideal gas depends upon

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Pressure

Temperature

Molar mass of the gas

All of the above

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

Glycerin boil at 290°C under normal atmospheric pressure. If the pressure is reduced to 50 mm of Hg, it will boil

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above the given temperature

below the given temperature

at the same temperature

at 25°C