Question # 1

Which of the following technique is most sanative one.

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Photomerty

AAS

Flame photometry

Flourimetry

Which of the following are neutral ligands.

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NH3

H2O

CO & NO

All of above

Iodination of benzene takes place in the presence of iodine and

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HNO3

HIO3

HgO

All of these

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

In Serpekr's process the ore is treated with which of the following.

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Carbon

Nitrogen gas

Both A and B

None of these

It is possible to distinguish between optical isomers.

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Using chemical tests

By mass spectrometry

By IR spectroscopy

By polarimetry

The size of nanoparticles is between __________ nm

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100 to 1000

1 to 100

0.1 to 10

0.01 to 1

In emulsions , the dispersed phase and the dispersion medium are.

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Both solids

Both liquids

Both gases

Phase is liquid and medium is solid.

In which property listed below hydrogen does not resemble alkali metals.

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Tendency to form cation

Nature of oxide

Combination with halogens

Reducing character.

The principal quantum number determines the overall size of the orbital and energy of the electron when it is associated with the orbital.It may have the values.

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n = 1,3,5.........infinity

n= 2,4,6................infinity

n = 1,2,3,4..............infinity

None of the abvoe

Hydrocarbon X (C6H12) on oxidation with hot alkaline (KMnO4) gives a mixture of prop ionic acid and dimethyl ketone. The structure of compound X is

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CH3CH = CHCH2CH2CH3

(CH3)2 C = CH CH2 CH3

CH3CH2CH = CHCH2CH3

(CH3)2 C = C (CH3)2

Different arrangement of groups in space which can be converted into one another by rotation around a single bond are caled.

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Conformations

Metameres

Enatiomers

All of the above

Which of the following statement is not correct with respect to limitations of Hammett equation.

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It is only applicable to aromatic systems

Only applicable to aliphatic systems

It is not valid for m-substituent

At higher altitudes, the boiling point of water is lowered because.

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Atmospheric pressure is low

Temperature is low at high altitude

Atmospherics pressure increase

None of the above

PCRA stand for

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Pollution control research association

Petroleum conversation Research association

Petroleum control research association

All of above

Which of the following metals form volatile carboyl with CO below 80^oC

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Cu

Fe

CO

Ni

The atomic number of potassium is 19 and that of mangness is 25 Although the colour of MnO4 is dark violet yet the K+ is colourless this is due to the fact that.

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Mn is a transition element while K+ is not

[MnO4]- is negatively charged while K+ has positive charge

The effective atomic number of Mn is [MnO4]- is 26: while for K+ the atomic number is 18

The Mn is a high positive oxidation state allows charge transfer transitions.

Which of the following specie is stronger acid than formic acid, HCOOH, in aqueous solution.

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CH3COOH

NH+4

H2SO-3

H4P2O7

Granulated sugar also known as.

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Brown sugar

Refined sugar

White sugar

None of these

The co ordination number of atoms in a hexagonal closed packed structure is

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2

6

12

4

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

Halogens are coloured because.

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They are strong oxidant

Their molecules are held together by weak van der Waals forces

Their atoms absorb radiations form visible range causing the excitation of valence electrons to higher energy of levels

Their molecules absorb light radiation forming the oxcited state.

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

The velocity possessed by maximum fraction of molecules at a given temperature is called.

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Average velocity

Root mean aquare velocity

Most probable velocity

None of the above

The statement that heat cannot flow spontaneously from a colder to a hotter body is the result of.

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The first law of thermodynamics

The second law of thermodynamics

The third law of thermodynamics

Henry's law

The number of phases of mixtures of four gases enclosed in a container is

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1

4

4-1

zero

The large increase in the rate of a reaction on rise in temperature is due to.

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The lowering of activation energy

The decreases in mean free path

The increase in collision frequency

The increase in the number of molecules having more than the threshold energy

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

Eutrophication is process which involves

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Depletion of ozone layer

Increase in the concentration of ozone in water

Decrease in the concentration of dissolved oxygen in water by algae

Decrease in the level of SO2 in air

Which of the following is component of the ecosystem.

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Inorganic substances

ORGANIC Substances

Animal and plants only

All above

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