Question # 1

A teacher told his student that air is a mixture. This is due to the reason that suddenly a student raised his hand and said:

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it has different properties from its constituents

oxygen can be removed from it

it is colourless

its composition is different at different altitudes.

The density of neon will be highest at

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STP

0°C, 2 atm

273°C, 1 atm

273°C, 2 atm

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts

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A

C

B

D

Which of the following is the element not present in all proteins?

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Carbon

Hydrogen

Nitrogen

Sulphur

Moles of protons in 20g of SO3

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10

20

40

80

CO2 and SO2 are both triatomic molecules, but heat of vaporization of SO2 is greater than that of CO2. This is due to

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greater electronegative character of sulphur

greater size of SO2 molecule

SO2 is polar and CO2 is non-polar

SO2 is more acidic in nature than CO2

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

At equilibrium rate of evaporation and rate of condensation

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Become very high

Become very low

Become equal

Can never be equal

Dehydrohalogenation of secondary butyI bromide will give

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Propene

1-Butene

Butene

2-Butene

A crystal system in which the unit cell has different all cell lengths but all angles equal to 90° it is called as

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orthorhombic

triclinic

monoclinic

cubic

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

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Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

The value of R in term of dm³torr k^-1mol^-1

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62400

62.4

8.313

0.0821

The deviation of a real gas from ideal behaviour is maximum at

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-10.0°C and 50 atm

-10°C and 2 atm

100°C and 2.0 atm

0°C and 2 atm

The pi-electrons in the styrene are

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13

10

8

6

Which of the following govern the diffusion of gases

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Dalton's law

Avogadro's law

Graham's law

Newton's law

Which of the following laws study the pressure-volume relationship of a gas at constant temperature,we get

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a straight line

a curve with different peaks

straight line parallel to x-axis

a curve called isotherm

Lactoglobulin is found in

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nucleus

nerve cells

Plants only

muscles and in plants

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

Coordination number of Zn and ZnS (Zinc blends) is

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4

6

2

None of these

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

The rate of E1 reaction depends upon

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The concentration of substrate

The concentration of substrate as well as nucleophile

The concentration Nucleophilic

Nature of Catalyst

Ethene is produced from ethyl chloride by reacting with alcoholic KOH. The process is called

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Hydrogenation

Dehydrogenation

Dehydrohalogenation

Oxidation

The value of critical temperature of a gas depends upon its:

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Size

Intermolecular forces in it

Shape

All of above

The addition of HCI to ethene gives?

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Chloroethane

1,2-dichloroethane

1.1-dichloroethane

2-chloroethane

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 compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?

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temperature and pressure both ara increased

temperature and pressure both are lowered

temperature is lowered and pressure is increased

temperature is increased and pressure is descreased

If allowed to expand, the gases suddenly

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heat up

move randomly

react

cool down

The concentration of product is increasing from 30 mole/dm3 to 40mol/dm3 in 0.5 sec then rate of reaction will be------moledm-3sec-1

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0

20

15

25

Which pair of the gases doesn't obey Dalton's Law of partial pressures

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H₂and O₂

N₂and O₂

H₂S and H₂

NH₃and HCl

A graph is plotted, P on x-axis and V on y-axis for a given mass at constant temperature, we shall get:

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a curve with different peaks

a curve called isotherm

straight line parallel to x-axis

a straight line

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

If the number of gas molecules are doubled in the certain volume the pressure is:

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Increased to four times

Remains unchanged

Doubeld

Decrease to half

By increasing pressure two times and decreasing temp. two times the volume of gas

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Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

Tertiary aleohols producewith acidified KMno,

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Ketones

Aldehydes

Malonic acid

Alkene

Which of the following is not a property of crystalline solid

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geometric shape

cleavage plane

anisotropy

isomerism

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 of the following equations represents the 2nd ionization energy of Na?

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Na(g) ---> Na²⁺ (g) + 2e^-

Na(s) ---> Na²⁺ (g) + 2e^-

Na⁺(s) ---> Na²⁺ (g) + e^-

Na⁺(g) ---> Na²⁺ (g) + e^-

.Both aldehydes and ketones are planar to the neighborhoods of carbonyl (C-0) group. Which one of the following bonds is distorted towards the oxygen atoms?

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pi-bond of C and O

Sigma bond of C and O

Sigma bond of C and H

Sigma bond of C and C

Doubling the pressure in a liquid phase reaction

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Will double the rex

Will increase the rex

Will decrease the rex

Will not alter the concentration of reactant

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

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72

6

24

36

The highest oxidation state of manganese is

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+7

-7

+6

+4

Which of the following is not molecular crystal

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Sugar

Iodine

Ice

Graphite

.The number of moles in 2.24 dm3 of H2 gas at STP is:

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1

0.1

10

0.01

A compound X has all of the properties below. It is a liquid at 25°C it mixes completely with water it reaets with aqueous sodium hydroxide, What could X be?

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_{Ethanoic acid}

Ethene

Ethanol

Ethyl ethanoate

Honey contains glucose and fructose along with some other ingredients. It has greater viscosity due to:

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irregular shape of the molecules

greater molecular size and strong intermolecular forces

H-bonding

irregular shape of the molecules

Aluminium is in Group lll, its oxide will have the formula.

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AlO

AlO₂

Al₂O₃

Al₃O₂

Triple point of water is

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273 K

373 K

203 K

193 K

Formamide is formed by the reaction of which acid with ammonia

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Oualic acid

Formic acid

Ethanoic acid

Propanoic acid

1, 3, 5-Pentanetriol has secondary carbon

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3

1

2

Zero

Which property of liquid is measured by polarimeter

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Conductance

Optical activity

Refractiye Indéx

Change in volume

A temperature at which two cyrstalline forms of a substances coexist in equilibrium is called

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standard temperature

critical temperature

transition temperature

absolute temperature

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

Which one of the following is not associated with SN2 mechanism

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100 % inversion of configuration

Tertiar alkyI halides

2nd order kinetics

Change of hy bridization from sp³ to sp² in transition state

Which one of the following reaction of carboxylic acid is reversible?

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Esterification

Salt formation

Reaction with PCI5

Reaction with SOCI2

Which of the following contains I mole of the stated particles

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Chlorine molecules in 35.5 g of chlorine gas

Electrons in 1 g of hydrogen gas

Hydrogen ions in 1 dm³ of 1 mol dm¯³ aqueous sulfuric acid

Oxygen atoms in 22.4 dm³ of oxygen gas at STP

The crystal of K₂SO₄and K₂CrO₄are orthorhombic. These are isomrophs due to

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same physical properties

their cations identical

number of O atms is equal

same shape of SO₄^-2and CrO₄^-2tetrahedral

The existence of an element in more than one form is called

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allotropy

isomorphism

polymorphism

isotropy

d-d transition cannot be shows by

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Cu+1

Sc+3

Zn+2

All