Question # 1

Acetone and Chloroform are soluble in each other due to

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intermolecular hydrogen bonding

ion-dipole interaction

instantaneous dipoles

dipole-induced dipole interaction

Which one of the following is a water soluble vitamin?

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niacin

riboflavin

tyrosine

ascorbic acid

Rise in vapour pressure of water from 30 to 60°C is only 32 torr to 149.4 torr (117.4 torr) but from 60 to 90°C is 149.4 to 527.8 torr (378.4 torr).it is due to

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change in geometry of H₂O molecules at higher temperature

decrease in volume takes place at higher temperature

vapour pressure of liquids increases rapidly closer to their boiling points

boiling starts

Keeping the temperature constant, if the gas is expended:

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Kinetic energy of molecules will increase.

Number of gas molecules increases.

Temperature will increase.

Pressure will decrease.

Which of the following is a steroid?

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vitamin A

vitamin B

vitamin C

vitamin D

The shielding effect of inner electron is responsible for

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Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

The main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

Lipids are naturally occurring compounds produced in cell and are water insoluble but soluble in organic solvent one of the following is not a lipid, Select among the following:

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nucleic acid

atriglceride

sterol

vitamin D

Which one of the following statements about melting point of metals is true?

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sodium has a lower melting point than potassium

sodium has a higher melting point than magnesium

potassium has a higher melting point rubidium

lithium has a lower melting point than sodium

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

Dissolved impurities of potable water can be separated by the process of

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reduction

Aeration

Electrolysis

Co-angulation

Electrolysis is used for :

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Manufacture of caustic soda

Refining of copper

Electroplating

All of above

Synthetic polymer prepared from caprolactum is known is

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Nylon 610

Teflon

Terylene

Nylon-6

In the presence of copper electrodes the electrolysis of aqueous CuSO₄produces at cathode

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H₂gas

O₂gas

SO₂gas

Cu metal

Due to the bacterial action on wood it is converted into

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Peat

Lignite

Bituminous coal

Anthracite

The hydrocarbon used for polymerization is

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Alkanes

Alkenes

Alkynes

All of above

Maximum freezing point falls in

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Camphor

Naphthalene

Benzene

Water

The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm^-1cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

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0.142 cm^-1

0.66 cm^-1

0.916 cm^-1

1.12 cm^-1

In electrolytic cells, the chemical changes may be :

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Either spontaneous or non-spontaneous

Always spontaneous

Always non-spontaneous

More spontaneous and less non-spontaneous.

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Rate = k[FeCl₃] [Kl]²

Rate = k[Fe⁺³][Cl^-1] [Kl]

Rate = k[Fe⁺³] [Cl^-1][K;]

Rate = k[Kl]³[FeCl₃]°

Chile saltpetre has the chemical formula

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NaNO₃

KNO₃

Na₂B₄O₇

Na₂CO₃H₂O

The pH range of the acid rain is

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8 - 7

7 - 6.5

6.5 - 6

Less than 5

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