Question # 1

The rate of diffusion of a gas of molar mass 72 as compared to H₂will be:

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Same

6 times

1.4 times

1/6 times

For better or worst we are living in society:

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wood

food

diseased

plastic

During the manufacturing process of cement the temperature of the decomposition zone goes up to:

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600°C

800°C

1000°C

1200°C

Photochemical smog consists of higher concentration of:

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Oxidants

Ozone

a & b

NO₃

In crystal structure of sodium chloride,the arrangement of CI^- ions is

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Fcc

Both fcc and bcc

Bcc

None of these

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

Which is the polymer that has amide linkage in its structure

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PVC

Poly ethene

Polyester

Nylon

Lactoglobulin is found in

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nucleus

nerve cells

Plants only

muscles and in plants

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic acid

It is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

The number of spherical nodes in 3p orbitals are

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One

Three

Non

Two

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

The tip of the funnel should touch the side of the beaker in order to avoid

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Splashing

Leakage

Mixing

Contamination

The apex angle of the folded filter paper is slightly greater is termed as:

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60 degree

30 degree

45 degree

90 degree

The bond order O₂molecule is

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1

2

3

Zero

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

Which of the following is a thermosetting plastic

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PVC

Polyethylene

Polystyrene

Melamines

Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

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3

2

1

0

Dehydrohalogenation of alkyl halides produces

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Alcohol

Alkane

Alkene

Alkyne

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