Question # 1

Surface tension is measured by

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viscometer

barometer

stalagmometer

manometer

Which of the following has isomorphous structure with MgO

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NaF

S

Sn

N

Which of following is oxidation state of oxygen in peroxides?

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-2

1/2

-1

+2

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Density of a gas is usually expressed in

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Kg m³

Kg dm³

g dm^-3

g cm^-3

Calorie is equivalent to

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0.4184J

4.184J

418.4J

40.18J

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

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constant P and T

constant P and V

constant T and V

constant n and v

One Pascal is equal to

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1 Nm^-2

1 Nm

1 Nm^-1

1 Nm²

Which one is very weak acid

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HF

HCI

H2CO3

H2O

Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.

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Negatively charged

H⁺ ions

Positively charged

equal positive and negative ions

Equal masses of methane and oxygen are mixed in an empty container at 25∘C.

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1/3

8/9

1/9

16/17

A reaction A- B is independent of concentration of reactant A. The order of reaction will be

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First order

Second order

Third order

Zero order

Which class of compound cannot show positional isomerism?

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Alkanes

Alkene

Alkynes

Alcohol

In which of the following compounds H-binding is not present?

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ethanol

ether

water

ammonia

Born-Haber cycle is an application of

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Hess's law

1" law of thermodynamics

Avogadro's law

1law of thermochemistry

Chloroform (CHCl3) is?

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid

In Boyle's law which of the following pair is variable:

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Temperature and quantity of a gas.

Pressure and volume.

Volume and quantity of a gas.

Pressure and quantity of a gas.

The heat of hydrogenation of most of the alkene is about

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120 kJ/mol

100 kJ/mol

140 kJ/mol

105 kJ/mol

The molecule of CO₂ in dry ice form are the:

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ionic crystals

covalent crystals

molecular crystals

any type of crystals

The boding which covalent molecules containing hydrogen and one of the small electronegative element such as O, For Mis called:

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ionic bonding

bridge bonding

H-bonding

metalic bonding

In crystal structure of sodium chloride,the arrangement of CI^- ions is

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Fcc

Both fcc and bcc

Bcc

None of these

A gas has non-ideal behaviour at:

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high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and low pressure

What types of bonds are broken when water turns into steam on heating?

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covalent

permanent dipole interactions

hydrogen bonds

induced dipole interactions

lonic solids don't conduct the electrical current because

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ion do not have translatory motion

free electrons are less

the coordination number of the ion is very high

strong covalent bonds are present in their structure

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

Which of the following is not an electrophilic substitutional reaction of benzene?

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Free radical chlorination of benzene

Friedel Craft alkylation

Sulphonation

Nitration

All are examples of different classes of enzymes except

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Hydrolases

Isomerases

Oxido-reductases

Mutases

Succinic thiokinase is an enzyme of the type

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mutase

peroxidase

ligase

lyase

The relationship which describes the variation of vapour pressure with temperature is called

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Hess's law

Arrhenius equation

Kirchhoff's law

Clausius-Clapeyron equation

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

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Oxygen

Silicon

Aluminium

Aluminates

2-propanol on oxidation yield

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Propionaldehyde

Propanone

Propanal

Butanal

Which of the following processes has always. ∆H=-ve

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Formation of compound

Dilution of a solution

Dissolution of ionic compound

Combustion

Which one of following statement about three about three states of matter is incorrect?

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in solids the particles vibrate about fixed positions

energy is released when a gas turns back to a liquid

particles in gases move in a random manner

the closer particles are together, smaller the force of attraction between them

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

According to kinetic theory of gases kinetic energy depends on

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Temperature

Collision

Pressure

Atomic number

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

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same as that of a hydrogen molecule

half that of a hydrogen molecule

two times that of a hydrogen molecule

four times that of hydrogen molecule

The stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

Plastics are amorphous solids and

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have sharp melting points

undergo clean cleavage when cut with knife

do not undergo clean cleavage

possess orderly arrangement over long distances

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

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 is an application of electrochemical series

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Prediction of the feasibility of chemical reaction

Calculation of the cell voltage

Prediction of reaction of metal with dilute acid

All of the above

General gas equation is combination of

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Boyle s law

Avogadro s law

Charles s law

All of these

Which one of the following alcohol is indicated by formation of yellow crystals in lodoform tesr?

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Methanol

Ethanol

Butanol

Propanol

Total number of valence electrons in CH4

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8

9

10

12

The electrical conductivity of the metals decreases with the increasing temperature. This is because

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the number of free electrons decrease

the bonds of the metal atoms become weak

the to and fro motion of the metal ions decrease

the increase of to and fro motion of the metal ions hinders the free movement of electrons

Steam causes more seers burns than boiling water. It is due to

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Latent heat of fusion

Latent heat of vaporization

Latent heat of sublimation

All of above

Phosphoprotein comes under the type of proteins

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Simple protein

Derived protein

Conjugated

Both A & B

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

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0.01 mole

0.064 mole

0.044 mole

0.054 mole

Which of the following is a strong acid

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CH3COOH

C2H5OH

HCOOH

Phenol

The intramolecular forces in gases are:

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Weak.

Normal.

Very weak.

Strong.

All the following have crystals except:

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potassium bromide

diamond

cadmium sulphide

sodium chloride

Some of crystals are good conductors of heat and electricity, they may be

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ionic in nature

of metallic character

covalent in nature

of molecular nature

Which one of the following gases has lowest density at room temperature:

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NH₃

Ne

N₂

CO

The crystal system are of

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7 types

10 types

5 types

8 types

The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm) assuming ideal gas behaviour is

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1

0.1

0.01

0.001

The volume occupied by 1.4g of N2at STP is:

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2.24 dm3

1.12 dm3

112 cm3

22.4 dm3

NaCl is completely ionized in water due to presence of

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hydrogen bonding

dipole dipole forces

ion dipole forces

London dispersion forces