Question # 1

The common host compound for the formation of inclusion compound is.

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Urea

Thiourea

Cholic acid

All above

Which of the following is strong adheaive.

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Epoxy resin

Melamine -formadehyde resin

Alkyd resins

Bakelite

Pyrolysis gasoline is obtained from.

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Catalytic cracking

Gasification

Steam cracking

Reforming

Considering the elements B, Al, Mg and K , the correct order of their metallic character is.

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B > Al > Mg > K

Al > Mg > B > K

Mg > Al > K > B

K > Mg > Al > B

TLC belongs to which of the following chromatographic techniques.

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Ion exchange

Partities chromatography

Adsorption chromatography

Gel permeation

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

The following oxo acids have been arranged in the order decreasir acid strength identify the correct order.

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III > IV > II > I

III > II > I >IV

I > II >III > IV

IV > III > II > I

The equilibrium constant value for a chemical reaction is 5 x 10²⁰which of the following statement is true with respect to this value.

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Reaction will be reversible

Reaction will proceed in backward direction

Reaction is at equilibrium

Reaction will proceed in the forward direction

Which of the following elements has the highest melting point.

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Magnesium

Calcium

Strontium

Berylliium

The following statements are true except one which one.

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Carburizing does not harden a steel

Flame and induction hardening require the use of hard enable steels.

Quench –hardened steel does not require tempering to present brittleness

None of these

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

What is clinker.

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Roasted calcareous material

Roasted argillaceous material

Roasted calcareous and argillaceous material

Roasted gypsum

The relative lowering of vapour pressure of a solution on the addition of non -volatile solute.

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Is equal to the mole fraction of solute

Is equal to the sum of the mole fraction of the solute and solvent

Depends upon the nature of the solute

Depends upon the mole fraction of the solvent

Which of the following statement is not true with respect to the role of matter undergoing decomposition.

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Decomposed matter increase soil fertility

They provide a texture which is favorable for plant growth

Organic compounds for complexes with mineral nutrients which enhance uptake by plants.

In high concentration the decomposition product may increase the photosynthesis

Which of the following bonds will be non polar.

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N - H

O - H

C - H

C l - Cl

Which of the following techniques are used for minimizing water pollution.

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Stabilization of ecosystem

Recharge of the waste

Waste treatment

All above

The variable valency is generally observed in case of.

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Transition elements

Inert gases

Normal elements

Non- metallic elements

Borax exist in the form

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Ordinary borax

Octahdral borax

Borax glass

All above

In which of the following compounds does hydrogen bonding occur.

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CCl4

NaH

HI

NH3

Which of the following statement is not true is case of catalytic reforming.

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Dehydrogenations high endothermic

Dehydrogenation is exothermic

Hydrodealkylation reactions are endothermic

None of these

Which of the following source is commonly used as excitation source in fluorimeter.

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Tungsten lamp

Mercury vapour lamp

Nernst vapur lamp

Radio souse

Allotropic form of tin

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White tin

Grey tin

Rhomic tin

All above

What is abuckyball

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A carbon molecule

Nickname for Mercedes -Benz's futuristic concept car (CIII)

Plastic explosives nanoparticle (C4)

Concrete nanoparticle with a compressive strength of 20 nanonewtons(C20)

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

The spectral line obtained when an electron jumps from n = 6 to n= 3 belongs to.

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Balmer series

Layman series

Paschen series

Bracket series

The dipole moments of the given species are such that.

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BF3 > NF3 > NH3

NF3 > BF3 > NH3

NHE > NF3 >BF3

NH3 > BF3 > NF3

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

Petroleum is mixture of

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Petrol

Diesal

Petroleum

All of these

Which of the following does not have an a,b, unsaturated carbonyl group.

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Androsterone

Oestrone

Testosterone

Progesterone

How many planes of symmetry are present in benzene.

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1 plane

3 planes

5 planes

7 planes

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