Question # 1

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

Which of the following case of acid or base strength is not explained by inductive effect.

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Formic acid> acetic acid

Dimethyl amine > trimethyl amine

Dimethyl amine > methyl amine

Chloroacetic acid > acetic acid

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

Which of the ionic possesses highest bond energy.

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C-C

Si -Si

Ge - Ge

Sn -Sn

While compacting the concrete by a mechanical vibrator, the slump should not exceed.

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2.5 cm

10 cm

3.1 cm

5.0 cm

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

Which of the following pairs does not represent Lowery acid base pair.

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H2O+NH3

H2O +H2O

HCL + H2O

CH3NH2 + BF3

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

The word 'ceramic' meant for.

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Soft material

Hard material

Burnt material

Dry material

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

Helium oxygen mixture is used by deep sea divers in preference to nitrogen oxygen mixture, because.

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Helium is much less soluble in blood than nitrogen

Nitrogen is much less soluble in blood than helium

Due to high pressure deep under the sea, nitrogen and oxygen react to give poisonous nitric oxide.

Nitrogen is highly soluble in wateer

a- pinene hydrochloride on warming rdarranges to form bornyl chloride.The rearrangement is known as.

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Pinacol pinacolone

Hofinann

Wager Mecrwein

Wolff

Which is not a pollutant from the exhaust of motor.

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Hydrocarbons

Carbon monoxide

NOx

Fly ash

Acute toxicity is expressed by the term

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LD50

IC50

I 1/2

Mean life

The pKa of acetic acid is 4.74 which implies that.

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pH of 1N solution is 4.74

At pH 4.74 the dissociation of acetic acid is maximum

At pH 4.74 half of the acetic acid molecules are dissociated in the solution.

At pH 4.74 the dissociation of acetic acid is minimum.

Maximum desirable concentration of fluorides according to international standard is.

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10-100 ppm

1 ppm

100-200 ppm

10-20 ppm

Which one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

Bond angle is minimum in

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H2O

CO2

NH3

CH4

Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O

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HNO3

H2SO4

Sodium per oxide

Ozone

Which of the following elements has the highest density.

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Mg

Na

K

Rb

Which of the following elements display maximum tnedency to form P Pi - p PI multiple bonds with itself and with carbon and oxygen.

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N

p

Bi

As

Ziegler -Natta catalysta is

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(C2H3)3 Al

TiCl4

(C2H5)3 Al/TiCl4

(C2H3)3 B/TiCl2

The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is.

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5s1, 4d5

6s1, 5d5

6s1, 5d6

6s1, 5d4

When rain is accompanied by a thunderstorm, the collected rain water will have pH

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Slightly lower than that of rain water without thunderatorm

Slightly higher than that of rain water without thunderastorm

Uninfluenced by occurrence of thunderatorm

Which depends on amount of dust in air

Which of the following sets of quantum number is possible for an electron in a 4f orbital.

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n = 4,l = 3, m = 4, s = +1/2

n = 4, l= 4, m = +4 , s = +1/2

n = 4, l = 3, m = +1, s = -1/2

n = 4, l = 4, m = +1 , s = -1/2

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

Which of the following statement is not correct regarding the stern theory of charge on colloidal particles.

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The colloidal particle has a charge distribution at its surface.

In the immediate vicinity of the colloidal particles there is an excess of counter ions

The greater the concentration and charge of ions in the diffused electrical double layer. the larger is the thickness of the layer

At large distance from the colloidal particles, the concentration of co-ions and counter ions are almost equal

Which of the following solution would have the largest depression in freezing point.

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1% glucose

1 % KCl

1 % AlCl3

1 % BaCl2

The alkali metal with highest melting point is

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K

Na

Li

Ca

A closed system is one which can exchange with surrounding.

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Matter but not energy

Energy but not matter

Both matter and energy

Neither matter nor energy

Which of the following statement in not correct with respect to inductive effect.

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Bond length decrease with increase in inductive effect.

Inductive effect generates polar character in bonds

Variation in strength of aliphatic acids can be explained

It alone cna explain the basically of triphenylamine

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