Question # 1

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

An electron with drawing group attached to e-position in phenol

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makes it basic

Stabilises the phenoxide ion

decreases its basicity

allows it to precipitate in aqueous solution

The one atmospheric pressure of air in term of pound per square inches is

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101.325

1.01325

760

14.7

The temperature of a gas is directly proportional to its

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average translational kinetic energy

enthalpy

internal energy

hydration energy

Water has high boiling point which is due to

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weak dissociation

hydrogen bonding

high specific heat

high dielectric constant

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

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Acetaldehyde

Propanal

Acetone

Propanoic acic

The actual volume of gas molecules is considered negligible at following pressures

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2atm

4atm

6 atm

8 atm

Which of the following may be called London dispersion forces

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dipole-dipole forces

ion-dipole forces

dipole-induced dipole forces

instantaneous dipole-induced dipole forces

Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then:

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rate of evaporation is greater than the rate of condensation

the rate of condensation is greater than the rate of evaporation

The rate of condensation and evaporation become equal

it depends upon the nature of the liquid

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 structural isomerism arises due to the difference in the

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Number of atoms in the molecule

Arrangements of atoms in the molecule

Number as well as arrangement of atoms in the molecule

Spatial arrangement of atoms

Which of the following gases diffuse quickly:

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N₂

NH₃

CO₂

Cl₂

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

The examples of a hexagonal system is

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sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

Which of the following alcohols is least reactive with respect to 0-H bond

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CH3OH

CH-CH2-OH

(CH3)2-CH-OH

(CH3)3OH

Which one of the following elements is most electropositive out of group I -A and II-A group?

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K

Mg

Na

Ca

Which of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

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

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0

+2

+1

+3

In a crystal a ≠ b ≠ c,a = y 90° and β ≠ 90° it is

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Monoclinic

Rhombic

Trigonal

Tetragonal

Which of the following elements is most metallic

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Bi

sb

As

P

The element which has greatest value of Reduction potential is used as

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Strongest reducing agent

Weak oxidizing and strong reducing agent

Strongest oxidizing agent

None of these

The value of Kc for H2O at 25C° is

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1x10 (-14)mole dm-3

14 mol dm-3

1.86×10(-16) mol dm-3

1.0x10 (-7)moldm-3

If allowed to expand, the gases suddenly

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heat up

move randomly

react

cool down

The reason that diamond and graphite have different physical properties is

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density

color

bonding

hardness

Proteins have linkage between amino acids

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imide

amide

ester

ether

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

The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the

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Molecularity of the reaction

specific activity of the reaction

Order of the reaction

rate constant of the reaction

Which of the following compounds does not exhibit positional isomerism?

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Alkynes

Nitroalkanes

Carboxylic acid

Alcohol

Hydration of ethene is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Oxidation state of Mn' in KMnO4. K2MnO4, MnO2 and MnSO4 is in the order

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+7.+6.+2,+4

+6,+7,+2,+4

+7. +6.+4.+2

+4, +6, +7,+2

Two substances that have the same crystal structure are said to be

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isomorphous

anisotropic

isotropic

polymorphous

For gases obeying Boyle's law, if pressure is quadrupled, the volume becomes

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Double

One half

One fourth

Remains constant

Increased concentration of enzyme alkaline phosphatase is a sign of

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hemophilia

heart disease

thrombosis

rickets

Which of the following is the correct equation to calculate relative molecular mass of a gas

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M=mPRTV

M=mPR/VT

M=PV/mRT

M=mRT/PV

A real gas obeying van der Waals equation will resemble ideal gas if

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Both a and b are large

a is large and b is small

Both a and b are small

a is small and b is large

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

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

Rate of which reaction increases with temperature?

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Exothermic and endothermic reactions

Endothermic reactions

Exothermic reactions

None of these

Dipole-dipole forces are present between:

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non-polar molecules

polar molecules

both polar and non-polar

none pf above

Elimination unimolecular reactions involve

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Second order kinetics

First order kinetics

Third order kinetics

Zero order kinetics

The bond angle between any two sp hybrid orbitals is A.109.28°

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107.09°

120°

90°

80°

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 of the following formula is correct for density of any gas

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d = RT/PM

d = PM/RT

d = MT/PR

d = RM/PT

What is true about an alcohol and phenol

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Both are more acidic than water

Both react with NaOH

Both produce CO2 with Na2CO3

Both, produce H2 with Na

An example of bydrolase is

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Amylase

Lipase

Fumarase

A,C

Among the following, which one is nucleophile

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H+

Ca2+

OH-

Na+

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

Variable Oxidation state of is related to transition elements

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empty d-subshells

Completely filled

Partially filled d-subshell

d-d transition

Corrundam is ore of which element?

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Al

Th

In

Mg

The element which shows highest binding energy

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V

T

So

Cr

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

2-Propenol, on rearrangement, yields

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Propanal

Propanone

2-propano

Both A and B

In intense electrical field and at a very high temperature matter generally exist in

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Solid state

Plasma state

Liquid state

Gaseous state

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

Which isomer of C4H9Br will produce 2-methyl propane-2-ol on treatment with aqueous KOH

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n-butyI bromide

Sec-butyI bromide

Isobutyl halide

Tertiary butyl chloride

Ar has low critical temperature and pressure due to its

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small size

monatomic molecule

low polarizability

liquefaction temperature close to room temperature

The density of a gas is 1.964 g dm-³ at 273K and 76 cm Hg The gas is

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CH₄

CO₂

C₂H₄

Xe

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

Which of the following alcohol is more soluble in H2O

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Propanol

Butanol

Pentanol

Hexanol

Which one of the following equations represents the 1st ionization energy of Na?

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Na(s) ---->Na⁺ (g) + e^-

Na(g) --->Na⁺ (g) + e^-

Na(s) --->Na⁺ (s) + e^-

Na (s) + e^- ---> Na⁺ (g)

Air contains 78% N₂, 21% O₂ and 1% other gases at sea level the partial pressure of O₂ is

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760 torr

159 torr

592 torr

7.6 torr