Question # 1

The ratio of most probable velocity to that of average velocity is

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π/2

2/π

√π/2

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

Surface and ground water sources are contaminate by various human activity. which of the following is not a human activity that causes contamination in fresh water?

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rain

live stock waste

oil leaks and spills

disposal of industrial effluents

The weight of 11.2 liters of CO₂ at S.T.P would be

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88 g

44 g

32 g

22 g

Poisoning of CO can be reveresed by giving oxygen at pressure:

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low

least

medium

High

Which of the following are thermoplastic materials?

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PVC

polystyrenes

polyethylene

all these

Casenogen is

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Chromoprotein

Phosphoprotein

Glycoprotein

Lipoprotein

CO2 and SO2 are both triatomic molecules, but heat of vaporization of SO2 is greater than that of CO2. This is due to

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greater electronegative character of sulphur

greater size of SO2 molecule

SO2 is polar and CO2 is non-polar

SO2 is more acidic in nature than CO2

Amino acid α-hydroxy carboxylic acid and

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CO₂ gas

H₂ gas

N₂ gas

NH₃ gas

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

Alkaline phosphatese is associated with ______ disease

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Heart disease

Rickets

Diabtese

None

Aniline reacts with which of these to form Schiff base?

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Acetic acid

Bezaldehyde

Acetone

NH₃

The oxide of beryllium is

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Acidic

Amphoteric

Superoxide

Basic

Which of the following species has unpaired electrons in antibonding molecular orbitals

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The temp. used for the hydrogenation of alkenes using Ni is

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2000°C

400°C

200-- 300°C

1000°C

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

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10^-5to 10^-6torr

10^-6to 10^-7torr

10^-7to 10^-8torr

10^-3to 10^-4torr

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Lead accumulator stops discharging current when

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Lead at anode converted to PbO₂

PbO₂at cathode converted to Pb

Both electrodes are completely covered with PbSO₄

Both electrodes are completely covered with Pb(OH)₂

Which statement in not correct about alcohol?

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Ethyl alcohol is heavier than water

Ethyl alcohol ecaporates more quickly

Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbons atoms

Alcohol produces H₂by reaction with sodium metal

Phenol was discovered by:

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Hofmann

Runge

Henderson

Bakelite

What is the name of the comlex [Ni(CO)₄]

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Tetracarbonylnickel (o)

Tetracabonylnickel

Tetracabonylnickel (II)

Tetracabonylnickel (IV)

Neutrons was discovered by

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Mosely

Milliken

Chadwick

Ruherford

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