Question # 1

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

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Acriflavin

Alizarin

Indigotin

Cyanine

Pick out the incorrect statement for CIF3

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It has trigonal planar geometry

It is used to make gaseous UF6 which is useful in making enriched U-235 fuel

It is used as powerful fluorinating agent for inorganic compounds

CIF2 has been used as fuel in short range rockets reating with hydrazine.

Chemical and physical properties of metal nano particles of atoms were observed to change periodically depending upon

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Number of atoms in a particle

Shape of particle

type of organization

All of the above

What is the most common alloying ingredient in copper?

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Brass

Zinc

Cobalt

Nickle

A system which can exchange energy as well as natter with its surrounding is said to be a/an

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Closed system

Inert system

Open system

All of above

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

The pH of 0.001 N HCl is

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1

2

3

4

The correct order of electron affinities of SI, P, and Cl is.

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P > Si > Cl

Cl > P > Si

Cl > Si, > P

Si > P . Cl

Variable oxidation states is shown by

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Normal eleemnts

Metallic elements

Non metallic elements

Transition elements

A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains.

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NO2 ion

NO3 ion

Br ion

I- ion

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

Which of the following statements is not related with flame photometric analysis.

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Vaporization of the solvent leaving back the residue

Conversion of solid slat to the gaseous state

Dissociation of gaseous molecules into free atoms

Measurement of the intensity of absorbed tradition

Aluminum is usually extracted from

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Bauxite

Corundum

Feldepar

Alumite

2- Butanol is optically active because a contains

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An asymmetric carbon atom

A plane of symmetry

Centre of symmetry

A hydroxyl group

Arrhenius concept explained

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Constant heat of neutralization

Quantitative determination of acid base strength

Catalytic property of acid

All above

Elements of group 14 have the electronic configuration of their outer shell as

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ns2 np3

ns2 np2

ns2 np6

ns2

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

Among group IA elements, melting point

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Increases down the group

Decreases down the group

Do not show any regular trend

Remains constant

Which of the following pentahalides is not formed.

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NF5

PF5

AsF5

BiF5

What is the advantage of quench hardening?

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Imporoved strength

Hardness

Wear characteristics

All of the choice

The most suitable method of separation in mixture of o-and p- nitrophenol is.

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Steam distillation

Chromatography

Ion-exchange

Sublimation

Helium is used for

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The preservation of food

Filling electrical transformer

Pressuring agent in rockets

All of above

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Boron and aluminum halides are electron deficient compounds in this respect. they act as.

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Lewis acid

Lewis base

Oxidizing agent

Reducing agent

In vinyl cyanide, the number of a bonds in

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2

3

1

4

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

Which of the following analytical techniques can be used to extract metal ion chelates.

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Solvent extractions

Evaporation

GC

Distillation

What do you call earth and stone missed with the iron oxide

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Hematite

Gangue

Ore

Residue

The decreasing order of the second ionization energies of K, Ca and Ba is

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K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

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

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18

17

1

2

Al Cl3 is used in

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Manufacturing of petrol

In borax bead test

Prezervation of food

All above

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