Question # 1

Which of the following element will have strongest van der Waal force of attraction between its molecules?

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nitrogen

hydrogen

oxygen

chlorine

A fibre which is made from acrylonitrile as monomer

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PVC

rayon fibre

acrylic fibre

polyester fibre

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

The gases H₂, O₂, H₂S and SO₂diffuse in the order

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SO₂>H₂S>H_2>O₂

H₂S>SO₂>O₂>H₂

O₂>SO₂>H₂>H₂S

H₂>O₂>H₂S>SO₂

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

Monomer for acrylic resins is

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Acrylic acid

Methylmethacrylate

Acryloritrile

All

Plastics are pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

A polymer may be

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Linear

Branched

Cross linked

All of these

Group VIB of transition elements contains

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Zn. Cd. Hg

Cr. Mo, w

Fe. Ru, Os

Mn. Te. Re

Which step is unnecessary for purification of water for drinking purposes

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Aeration

Coagulation

Treatment with chlorine

Treatment with iodine

When primary amine reacts with chloroform in ethanolic KOH, then the product is

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An isocyanide

An aldehyde

A cyanide

An alcohol

Which of the following will affect the rate :

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First step of reaction.

Last step of reaction.

Rate determining step.

Fastest step.

Which of the following gases is used for illuminating purpose?

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Methane

Ethane

Propane

Butane

Coal is obtained from dead remains of

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Plants

Animals

Both a and b

None

The melting point is lowest for

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Be

Mg

Ca

Sr

If the radius of first Bohr orbit be a_o, then the radius of third Bohr orbit would be

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3 x a_o

6 x a_o

9 x a_o

1/2 x a_o

When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is

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Propane

Propylene

Acetaldehyde

Acetone

Catalyst in the reaction ROH + SOCl₂-------> RCL+SO₂+HCl is:

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ZnCl₂

Pyridine

H₂SO₄

Either

Calculate the amount of charge flowing in 2 minute in a wire of resistance 10Ωwhen a potential difference of 20 V is applied

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120 C

240 C

20 C

4 C

Acetic acid is miscible in:

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Water

Alcohol

Either

All of these

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