Question # 1

The temperate of a gas below which only the gas cools when allowed to expand is know as.

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Inversion temperature

Ideal temperature

Critical temperature

Joule Thomaon temperatu4re

Electronegativity of oxygen is.

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2,5

3,5

2,4

2.1

When HCl is titrated against NaOH , the pH at the equivalence point is.

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zero

> 7

< 7

14

In diborane (B2H6)

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The structure is similar to that of C2H6

All the atoms are in one plane

The born atoms are linked through hydrogen bridges

There is a direct boron boron bond

The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called.

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Free energy

Threshold energy

Activation energy

External energy

Which of the following technique is based on the absorption of light radiation.

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Spectrophotomerty

Colorimetry

NMR

All the above technique

The terpenoid present in oil of lemon grass is

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Citral

Geranial

Nerol

a- terpineol

In Nano synthesis new unsual chemical reactions are due to.

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Non equilibrium system

Equilibrium system

Isothermal system

Adiabatic process

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

Which of the following elements has the highest ionization energy.

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Na

Si

Ar

Cl

In which pair of species, the Lewis formula contain same number of Lone pairs and bond pairs but they are not iso electronci.

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O2 B2

SO2, O3

PCl3, BF3

SOCl2, COCl2

The link between classical thermodynamics and quantum mechanics is prevented by

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Statiatical mechanics

Boltzmann law

Wave mechanics

Matrix mechanics

The unit of sound pressure level is

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Pascal

Decibel

Newton

Ampere

The formation of daughter DNA's from parent DNA is called.

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Transalation

Transcription

Reproduction

Replication

Aromatic amine (X) was treated with alcoholic potash and another compound (Y) when foul smelling gas was formed with formula C2H3N (Y) was formed by reacting a compound (Z) with Cl2 in the presence of slaked lime . The compound (Z) is

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C6H5NC

CHCl3

CH3CH2OH

C6H5NH2

The unit of nucleic acid having base sugar combination is called.

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Nucliec acid

Nucleoside

Nucleotide

None of these

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

The reverse of photo chemical reaction is called.

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Phosphorescence

Chemiluminescence

Fluorescence

Photscnaitization

Which of the following compounds would be most ionic to charcter.

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PbCl4

PbCl2

SnCl4

SnCl2

Which of the following phenomenon are driven by solar energy.

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Winds

Water cycle

Production of biomass

All above

Which among the following is insoluble in water.

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LiOH

KOH

NaOH

RbOH

What is the function of Head Box in paper making machine.

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It dry the paper

It reduces thickness of paper

It makes the surface of paper smooth

It discharge the pulp at the screen of fourdrinier table

Which of the following is not strong electrolytes.

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HCl

H2SO4

HNO3

CH3COOH

Artificial nitrogen fixation may occur by the formation of.

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Nitric acid

Ammonia

Nitrides

Any of above

In each period, the most electropositive element belongs to group.

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18

17

1

2

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

A chromophore is an isolated fractional group which has

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Coloured appearance

Absorption in UV visible region

Only sigma bonds

Absorption in the region

Each of the following when present at para position decreases the acidic strength of phenol except.

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-NH2

-Cl

CH3O-

CH3-

The isotonic nucleotide X and Y have mass numbers 35 and 37 respectively if the atomic number of X is 17 the atomic number of Y will be.

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15

17

19

18

The silicate chains are present in

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Silica

asbestos

Beryl

Clays

Which of the following dyes belongs to the group of acridine dyes.

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Acriflavin

Alizarin

Indigotin

Cyanine

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