Question # 1

The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure,temperature,and volume of the gas.

The amount of heat required to vaporize one mole of liquid at its boiling point without change in temperature is called

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molar heat of vaporization

molar heat of sublimation

molar heat of fusion

none of these

Evaporation causes

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High temperature

High pressure

Cooling

Vapour

Most of the universe consists of the matter in :

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Gaseous state

Liquid state

Plazma state

Solid state

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

Tertiary alcohols are the easiest to dehydrate because

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They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

Catalyst used for ammonia synthesis is

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Cu

Co

Zn

Fe

The state of matter which exist only within a relatively narrow range of temperature and pressure

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Solid

Gas

Liquid

Plasma

Freshly cut metals have a shining surface because

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electrons excited, then excited electrons release energy as light

metals have brittle nature

metals conductivity increases

metals are malleable and ductile

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Acetic acid reacts with thionyl chloride to form acetyl chloride, which species acts as nucleophile in the reaction

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SO3

SO2

Cl-

No nucleophile is formed

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

The maximum oxidation state of Mn is

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+6

+7

+5

+4

The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called

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Heat of reaction

Heat of formation

Heat of atomization

Heat of combustion

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is

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1

2

3

4

The question vapour cause by heating a liquid is due to:

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increase of intermolecular interactions

increase of K.E of molecules

decrease of surface tension

increase in potential energy of molecules

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

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Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

Which of the following is a limitation of balanced chemical equation

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Conditions and rate of reactions

Physical state and mechanism

Reactants and products and their coefficients

Both (a) and (b)

Which of the following is a pseudo solid?

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CaF₂

glass

NaCl

all these

R = 0.08205:

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atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

lonization of KCIO3. is suppressed by

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Increasing temperatuse

adding KCl

adding NaNO3

Decreasing temperature

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

The weight of 11.2 liters of CO₂ at S.T.P would be

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88 g

44 g

32 g

22 g

When water freezes at 0°C, its density decreases due to

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cubic structure of ice

empty spaces present in the structure of ice

change of bond lengths

change of bond angles

TiCl4 is used as catalyst for manufacture of

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Sulphuric acid

Plastics

Ethanol

Tetraethyl lead

If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to

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4P

P

2P

3P

Water has high boiling point which is due to:

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high electric constant

weak dissociation

high specific heat

H-bonding between its molecules

Stability of Cu-metal is due to filled of d-orbital

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Half

Completely

Partially

Quarterly

Acetone and chloroform are soluble in each other due to:

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intermolecular hydrogen bonding

dipole-dipole interaction

instantaneous dipoles

all of the above

Prosthetic groups are

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helical structures in protein

sulphur containing parts of protein

non-protein parts in compound proteins

sites for hydrogen bonding

Keeping in view different factors which affect the melting point of a substance.the compound having melting point among the following is:

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LiCl

NaCl

CsCl

RbCl

The total number of lattice arrangements in different crystal system is

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7.0

3.0

8.0

14

2,4,6-Trinitrophenol is commonly called as

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Phthalic acid

Tartaric acid

Malonic acid

Picric acid

The oxidation state of transition elements is usually

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Variable

Single

Constant

Infinite

What is the numerical value of 'R; (the gas constant) in S.I units?

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83143 J/mole/K

Avogadro's law

83.143 J/mole/K

8.3143 J/mole/K

Which of the following decides the reactivity of alkyl halides?

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C-C bond strength

C-H bond strength

C-X bond strength

Electronegativity difference

If volume of an ideal gas at 0°C 536cm3, what is volume at 1°C

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373 cm3

646 cm3

Becomes 0cm3

746 cm3

One degree on Celsius scale is ______ time greater then Fahrenheit scale

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9/5

5/9

6/5

5/6

In proteins, the alpha-helix and Beta-pleated sheet are examples of

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^{Primary Structure}

Secondary Structure

Tertiary Structure

Quaternary Structure

For reaction of methane and chlorine light is not available then

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Reaction will take place rapidly

No Reaction take place

Reaction occurs at double the rate

May all cases occur

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

The deviation of a gas from ideal behavior is maximum at:

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-10∘C and 5.0 atm

-10∘C and 2.0 atm

100∘C and 2.0 atm

0∘C and 2.0 atm

NaOH+HCI- NaCI+ H2O. Enthalpy change in the above reaction is called

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Enthalpy of reaction

Enthalpy of Neutralisation

Enthalpy of formation

Enthalpy of combustion

Amount of product formed increases with time, this statement is true for reactions-------with kinetics

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1s order

3rd order

zero order

Any order

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

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

Air at sea level is dense.This is a practical application of

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

The rate of diffusion of a gas of molar mass 72 as compared to H₂will be:

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Same

6 times

1.4 times

1/6 times

Which gas molecules escape through a hole of molecular dimension this phenomenon is called

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diffusion

mixing

effusion

flowing of gas

The sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

Which of the following enthalpy change always have a negative value

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∆Hf

∆H sol

∆Hc

∆Hat

Which pair of elements will have the same type of bonds between their atoms in the solid state?

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carbon and calcium

lithium and boron

aluminium and phosphorus

nitrogen and carbon

All the following have crystals except:

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potassium bromide

diamond

cadmium sulphide

sodium chloride

In MgCl2, the oxidation state ofCI is

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Zero

-2

+2

-1

Among the following the polycyclic aromatic compound is

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Styrene

Naphthalene

Toluene

Acetophenone

Which of the following tends to approach ideal gas like behavior at R.T.P

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ammonia

neon

carbon dioxide

chlorine

Ethane nitrile can be converted into ethanoic acid through......intermediate

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Ethyl alcohol

AcetyI chloride

Acetamide

Methyl cyanide