Question # 1

Toluene is o/p -orienting with respect to an electrophilic substitution reaction due to.

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+1 effect of the methyl group.

+1 as wellas +H effect of the methyl group

Hyper conjugatin between the methyl group and phenyl ring.

+ R effect of the methyl group

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

In the formation of H2O molecule, the oxygen atom makes use of.

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2p orbitals

sp hybrid orbitals

Sp2 hybrid orbitals

Sp3 hybrid orbitals

The compounds whose formation require a host compound and a guest compound are called.

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Exclusion compounds

Inclusion compounds

Crystal compounds

None of the above

Which of the following is not an ore of nickel.

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Pentalandite

Siderite

Garnierite

Nicollite

O2 molecule is.

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Fermagnetic

Forromagnetic

Paramagnetic

Diamagnetic

The change of chemical potential of any component with temperature an constant P and composition, is euqal to.

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Partial molar enthalpy of that component

Partial molar volume

Partial molar free energy

Negative of the partial molar entropy

20 micron =____________________ nm

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20 x10^-9

20000

200

20x10⁹

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

Sea water is converted into fresh water bases upon the phenomenon of.

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Plasmolysis

Sedimentation

Diffusion

Osmosis

Reverse osmosis

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

The forces which holds the atoms together in a molecule is called

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Ionic bond

Covalent bond

Co ordinate bond

Chemical bond

Which of the following statement is not correct with respect to hydrolytic cycle.

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Water covers about 83% of the earth's surface

Water covers about 73% of the ear5th's surface.

It is the major constituent of the lithosphere

it is essential requirement of all the organisms

Which of the following is an example of molecular solids.

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MgO

ZnO

Ice

Graphite

Group VA of the periodic table consist of elements.

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3

4

5

6

Gold dissolves in aqua regia forming

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AuCl

Au(NO3)3

AuCl3

HAuCl4

The sugar present in RNA is

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D- ribose

D-Arabinose

D-Glucose

Deoxyribose

Which of the following item is not symmetry element.

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Pllane of symmetry

Inversion centre

Improper rotation

Optical activity

The variable valency is generally observed in case of.

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Transition elements

Inert gases

Normal elements

Non- metallic elements

In compressive strength of a nanotube ______ its tensile strength.

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I less than

Is greater than

Is equal to

Less than or equal to.

Which one of the following statements is not true.

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Transition metals form alloys

Transition metals form complexes

Zn, Cd and Hg are transition metals

K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn

In the long form of periodic table, elements are arranged according to.

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Increasing atomic number

Decreasing atomic number

Increasing atomic mass

Decreasing atomic mass

Considering the element B,C, N, G and Si, the correct order of their non- metallic character is.

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B > C > Si > N > F

Si > C > B > N > F

F > N > C > B > Si

F > N c > > SI > B

The rise of a liquid in capillary tube is due to.

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Osmosis

Diffusion

Surface tension

Viscosity

Which of the following reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

Which of the following is soluble in water.

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AgF

AgCl

AgBr

Ag I

Phenol on reaction with ethanoic anhydrides in the presence of sodium ethanoate gives.

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Phenyl benzoate

Ethyl benzoate

Phenyl ethanoate

Phenyl methyl ether

In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up in.

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Slag

Gangue

Metallic calcium

Calcium carbonate

Which of the following contains isoprene unite.

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Natural rubber

Nylong -6,6

Polyethylene

Decron

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

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