Question # 1

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

By the electrolysis of CuCl2 using inert electrodes of platinum which species is deposited at cathode

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H2

O2

Cu

CI

Which pair of transition elements shows abnormal electronic configuration?

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Sc and Zn

Cu and Sc

Zn and Cu

Cu and Cr

Final product of hydrolysis of nitrile is

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Ketone

Alcohol

Aldehyde

Carboxylic acid

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

Abumins and globulins are defined as

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Derived protein

Conjugated protein

Fibrous protein

Simple Protein

Ethanoic acid reacts with PCI5, to give ethanoyl chloride. HCI and a third compound What is the third compound

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H3PO3,

POCI3

SO2

COCl2

Viscosity of a liquid is measured by

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barometer

thermometer

viscometer

manometer

Point out that which is not an application of liquid crystals?

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Source of energy

In display of electrical devices

For skin thermography

As temperature sensor

Bond will be covalent when electronegativity difference of bonded atom is

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Equal to 1.7

between 0.5 to l.7

Greater to 1.7

zero

The B.P. of compound is mostly raised by

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dipole-induced dipole interactions

london dispersion forces

intramolecular H-bonding

intermolecular H-bonding

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

Which one of the following groups is indicated when HCI is formed by reaction of ethanol with phosphorous pentachloride?

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Amino group

Halide group

Hydroxyl group

Hydride group

Which is an intermediate in Svl

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Ethoxide ion

Alkene

Alkyl halide

Carbocation

For an endothermic reaction, enthalpy of reactants

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Is smaller than that of the products

Is greater than that of the products

Must be greater or smaller than that of the products

Is equal to that of the products

The material possessing superconducting properties is

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Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will be:

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Remain uncharged

Double

Reduced

Increased four times

An alkyl halide reacts with NH3 to give

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Amide

Cyanide

Amine

Aniline

The number of NaCI molecules in unit cell of its crystal is

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2

4

6

8

Strong dipole-dipole forces among the liquid molecules are responsible for

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very high heat of vaporization

very low heat of vaporization

cannot be predicted

negligible forces are these

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

Boiling point of water remains 100°C although heat is continuous supplied. it is because

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decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

One of the following does not give the flame test. Which is that

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Sr

Bа

Be

Na

Ionic solids with defects,contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacanies

Cation vacancies only

Cation vacancies and interstitial cations

Which one is a non-polar compound?

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SnCl2

PH3

Gecl4

H2O

At same temperature which substance has high kinetic energy:

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Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

With increase in temperature, ionic product of H2O

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Decreases

Remains same

Increases

May increase or decrease

The most complex strueture a single polypetide can assume is

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1° structure

2°structure

3° structure

4° structure

Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields

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Ketone

Carboxylic

Alkyl halide

Ester

Solids in which atoms, ions or molecules are not regularly arranged are

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crystalline solid

amorphous solids

liquid crystals

low melting points

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

Amorphous solids

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have sharp melting points

undergo clean cleavage when cut with knife

have perfect arrangement of atoms

can possesses small regions of orderly arrangements of atoms

Hydrogen diffuses six times faster than gas A.The molar mass gas of gas A is

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72

6

24

36

Most of the universe consists of the matter in :

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Gaseous state

Liquid state

Plazma state

Solid state

The motion imparted to the gas molecules by gravity is

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very small

very large

negligible

appreciable

Mg(s) + 2HCI(aq). ------------ MgCl2(aq)+ H2(g)

Given that; Mg=21g and HCI=21g, the excess reactant is

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Mg

HCI

Both are in stoichiometric amounts

None of these

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

Which of the following metal oxides is antiferromanetic in nature?

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MnO₂

TiO₂

NO₂

CrO₂

Which one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from:

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3L to 1L

4L to 2L

6L to 4L

8L to 2L

Gases deviate from ideal behaviour at high pressure.Which of the following is correct for non-ideality?

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at high pressure the gas molecules move in one direction only

at high pressure the collisions between the gas molecules are increased manifold

a high pressure the volume of the gas become insignificant

at high pressure, the intermolecular attraction becomes significant

Furan is a compound

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Acyclic

Alicyclic

Heterocyclic

non-aromatic

The process of effusion is best understood by law

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Grahams

Boyle s

Charles s

Avogadro s

One Pascal is equal to

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1 Nm^-2

1 Nm

1 Nm^-1

1 Nm²

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

If a graph is plotted between temperature on x-axis and volume on Y-axis for 1 mole of gas,then we get straight line which cuts the temperature axis at

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-300°C

300 K

-273.15 K

273.15°C

One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.

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30

3000

3

300

For the reaction H2(g) +I2 (g) <---------> 2Hl(g). The equilibrium constant changes with

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Total pressure

Catalyst

Concentration of H2 and I2

Temperature

What forces operate between ethyl group of ethyl alcohol and oxygen of water

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H-bonding

attractive forces

repulsive forces

dipole forces

The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps.it is known as

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Henry's law

Hess's law

joule's law

Law of conservation of energy

Which one of the following statements about diamond is not true?

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the coordination number of carbon atoms is 4

diamond is an isotpe of graphite

diamond has a high melting point

diamond has a rigid tetrahedral, structure

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

The long chains of amino acids are coiled around one another into a spiral by

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ionic bond

Van der Waal's forces

hydrogen bonding

overlapping of orbitals

The solubility of A2B3 is X mole dm-3. Its Ksp is?

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6X(5)

36X(5)

64X(5)

108X(5)

Which of the following metal does not liberate hydrogen on reaction with acid?

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Mg

Pt

Zn

Ca

The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH

The reagent and the condition used in this reaction may be:

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H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

Which of the following statements is not correct about galvanic cell?

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Anode is negatively charged

Cathode is positively charged

Reduction occurs at anode

Reduction occurs at cathode