Question # 1

Alicyclic compounds are the homocyclic compounds which contain a ring of

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5 or more carbon atoms

6 or more carbon atoms

3 or more carbon atoms

4 or more carbon atoms

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

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

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ammonia

neon

carbon dioxide

chlorine

Equal volume of all gases at same temperature and pressure contain number of molecules:

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multiples

equal

different

in fractions

Formalin contains-------% alcohol.

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37

80

8

52

Transition compounds which occur as tripositive ions have no

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4s-electron

3p-electron

3s-electron

2s-electron

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

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

Evaporation causes

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High temperature

High pressure

Cooling

Vapour

The stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

At different temperature, the vapour pressure of water is

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different

same

low

high

Which of the following element has high m.p and b.p, it acts as a reducing agent, and can react with bases?

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Sr

Ca

Be

Mg

When wine is put in air, it becomes sour due to

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Oxidation of C2H5OH

Formation of C2H5NH2

Reduction of C2H5OH

Dissolution of CO2

Glyoxal molecule has?

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two carbonyl groups

One aldehydic and one carbonyl group

Two aldehydic groups

Two carboxyl group

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product

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Acetaldehyde

Propanal

Acetone

Propanoic acic

If reactants are conductor of electricity, then method is used to measure the change in concentration of reaction

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Optical rotation

Refractrometric

Dilatometric

Electrical conductivity

Slight oxidation of primary alcohol eives

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Ketone

Aldehyde

-Organic acid

An ester

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

For which mechanisms, the first step involved is the same

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E1 and E2

E2 and SN2

E2 and E1

E1 and SN1

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

At 100 atm, CH₄ develops:

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Ideal attitude

Non-ideal attitude

Serious attitude

Laughing attitude

An ideal gas expands according to PV=constant. On expansion, the temperature of gas

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will rise

will drop

cannot be determined because the exteral pressure is not known

will remain same

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

Liquids are less common than:

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Solids.

Plasmas.

Gases.

All of above.

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

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

The amount of energy released when gaseous ions of opposite charges combine to give one mole of a crystalline ionic compound is called

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bond energy

heat of formation

lattice energy

ionization energy

Absolute zero is equal to:

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-273.15K

-273.15^oC

-237.15K

-273 ^oC

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

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temperature is lowered and pressure is increased

temperature is increased and pressured is lowered

temperature and pressure both are lowered

temperature and pressure both are increased

Polymorphism is shown by AgNO3. Which one of the following options is true for AgNO3?

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Orthorhombic and rhombohedral

Cubic and orthorhombic

Cubic and tetragonal

Monoclinic and hexagonal

Which one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

Ethyl and methyl groups are equidistant in a chain, the preference is given to?

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Ethyl

methyl

both ethyl and methyl

methyl mostly

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

In order to mention boiling point of water at 110∘C the external pressure should be:-

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between 760 torar an 1200 torr

between 200 torr and 760 torr

765 torr

any value of preessure

The potential difference set up at 25 C and 1 atm when clectrode is dipped m Tis one molar ionic sohution is called

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Single electrode potential

electrode potential

Standard electrode potential

Standard hydrogen electrode

How many balloons of 0.25 dm³capacity at I atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm³capacity at 10 atmospheric pressure

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50

90

180

200

Allotropic forms of carbon are:

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five

three

four

two

The highest temperature above which a gas cannot be liquified no matter how much pressure is applied, is called as

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critical temperature

absolute zero

liquefaction temperature

boiling point

Kerosene is liquid at room temperature.This is due to:

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organic nature

H-bonding

molecular size

dipole-dipole forces

The motion imparted to the gas molecules by gravity is

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very small

very large

negligible

appreciable

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

Collagen is a fibrous protein present most abundantly in

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heart

nucleus

connective tissues

Arteries

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

For what value of Kc almost forward reaction is complete

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Kc.=10(-30)

Kc.=1

Kc = 10(30)

Kc,=0

For N2: +3H2<--------> 2NH3, if Kc is 1 than value of Kp at 273K would be

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1/22.414

1/(22.414)2

22.414

11.207

An example of bydrolase is

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Amylase

Lipase

Fumarase

A,C

When the concentration of product is increased the instantaneous rate of reaction with reference to reactants will be

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Positive

Negative

the same

falling curve

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

Deep sea divers breath air under increased pressure, therefore they use a mixture of

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96% N₂and 4% O₂

96% O₂and 4% N₂

94% N₂and 6% O₂

94% 0₂and 6% N₂

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

At which oxidation state Cu achieves electronic configuration of Zn+2

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0

+2

+1

+3

Which of the following contains maximum of number of molecules?

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100 cc of CO₂ at STP

150 cc of N₂at STP

50 cc of SO₂ at STP

200 cc of NH₃ at STP

Hydrogen has a = 0.245 atm. dm³. mole^-2and b = 0.0266 dm³. mole^-1SO₂gas has a = 6.170 atm. dm³mole^-2and b = 0.0564 dm³mole where a and b are Van der Waal's constant

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H₂gas deviates more from ideal behaviour tha SO₂

SO₂gas deviates more form ideal behaviour than H₂

both deviate from ideal behaviour equality

both are ideal gases

The instrument that is used to measure the pressure of a gas is called

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viscometer

photometer

barometer

stalagmometer

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

SN2-reactions can be usually observed in

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Primary alkylı halide

secondary alkyl halide

Tertiary alkyl halide

Both A. and B

Which is an intermediate in Svl

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Ethoxide ion

Alkene

Alkyl halide

Carbocation

Van der Waal's forces exist in

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Polar compounds

Non-polar

Covalent

All types of atoms and molecules

Ionic crystals are brittle because

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they have cubic geometry

they are bad conductors of electricity

coordination number of cations and anions is same

cations and anions are arranged in alternate positions in layers