Question # 1

Which of the following symmetry element leaves the molecule or an object unchanged.

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Proper rotation

Improper rotation

Inversion axis

Identity

The most electronegative element of the third period is.

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F

P

Br

Cl

Xenan hexaflouride at 47.7 ^oC is

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Colorless solid

yellow solid

Yellow liquid

Colorless liquid

Nano technology in other words is.

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Carbon engineering

Atomic engineering

Small technology

Microphysics

Which of the following elements has the highest value of second ionization energy.

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Lithum

Beryllium

Boron

Magnesium

Which of the following method of analysis is based on diffraction of radiation.

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Mass spectrometry

Polarography

Potentiometry

Raman scattering

Classical smog occurs in place of.

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Excess concentration of SO2

Low temperature

High temperature

Excess concentration of ammonia

Steel is an alloy of iron and carbon with limits on the amount of carbon to less than _______ percent.

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2

3

1

4

What is graphene.

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A new material made from carbon nanotubes

A one atom thick sheet of carbon

This film made from fullerene

A software tool to measure and graphically respresent nanoparticles.

Chemical compounds which are added to reduce to reactivity of glass are called.

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Formers

Modifiers

Stabilizers

None of these

According to Arrhenius theory an acid is defined as substance which

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Accepts and electron pair

Donatees H+ ion in ammonia

Contains Cl- ions

Furnishes H3O + ion in water

Which of the following statement is not correct n respect of Arrhenius concept.

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The concept is applicable only for aqueous systems.

Neutralization takes place in aqueous mediam only

TH+ ion cannot remain as such in water

This concept is applicable for non aqueous system only.

Which of the following will exhibit variable electro Valency due to intert pair effect.

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Fe

Sn

K

Both Fe and Sn

Gold dissolves in aqua regia forming

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AuCl

Au(NO3)3

AuCl3

HAuCl4

Which of the following statement is not related with environmental pollution.

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Direct or indirect change in any component of the biosphere

Undesirable change in the physical characteristics of the air

Undesirables change in the biological characteristics of the soil

not affecting adversely the industrial progress

An auxochrome is a group which

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Absorbs in UV region

Absorbs in visible region

Absorbs in IR region

Increase absorption wavelength of chromophore

Black and white photographic film contain small grains of.

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Silver bromide

Silver cholride

Silver iodide

Any of above

Which of the following regions of the spectrum would be used to determine the structure of the crystalline solids.

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Microwave

X-rays

Visible

Infrared

Which one of the following is natural polymer.

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Starch

Nylon-6

Neoprene

Buna-S, SBR

Which of the following is used to make non-stick material.

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Vinyl cyanide

Tetrafluoroethene

Vinyl chloride

Styrene

Ten elements Sc (Z = 21) to Zn (Z = 30) fill their 4s orbitals first and then 3d orbitals are called elements. of.

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3 d series.

4d Series

5d Series

None of above

The shape of SO₄^2-ion is.

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Tetrahedral

Trigonal planar

Square planar

Octahedral

Acid rain effects

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Human being

Crops

Aquatic life

All above

The base which in not present in DNA is

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Adenine

Guanine

Thymine

Cytosine

Gases and dust particles are removed from H2SO4 by

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Tydal effect

Drying tower

Absorption tower

Contact converter

Treatment of phenol with cold dilute nitric acid gives.

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Only o-nitro phenol

Only p-nitro phenol

2,4,6 -Teinitro phenol

Mixture of o-and p-nitro phenol

Amino acids are are important in biochemistry which of the following statements is not correct regarding amino acids.

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These are amphoteric substances tend to undergo internal protein transfer

In aqueous solutions these substances tend to undergo internal proton transfer

These for zwitter ion in aqueous medium

These always contain two amino groups.

The correct order of acidic strength is.

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HF < HCl< HI < HBr

HI <HBr < HCl < HF

HI < HBr < HF < HCl

HF < HCl < HBr < HI

Which of the following solutions of sulphuric acid will exactly neutralize 25 mL. of 0.2 M NaOH

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12.5 mL of 0.1 M solution

24 mL OF 0.1 m Solution

50 mL of 0.1 M solution

None of the above

The number of coordinates required to specify the position of all the atoms in a molecule is called number of degree of freedom. The vibration degrees of freedom of a linear molecule containing N atoms are

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2N-5

2N -6

3N -5

N-6

Which of the following statement about molecularity is not correct.

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It cannot be fraction

It can be obtained from balanced equation

It may be or may not be equal to the order of the reaction

it can not be more than 3

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