Question # 1

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

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Half

Completely

Partially

Quarterly

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

Which of the following alkyl halides undergoes SN1 reaction fastest

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Methyl chloride

Isobutyl chlorido

Ethy l chloride

Tertiary butyl chloride

The Cl- ion present at the corner of the unit cell is NaCl crystal, contributes

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1/8 th

1/4 th

1/2 th

1

Which of the following gases have maximum root mean square velocity at 25°C:

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SO₂

NH₃

CO₂

H₂S

What is the weight of 10 dm³of CO₂at 27°C and 2 atm?

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89.3 g

56.1 g

125 g

127 g

Simplest Structure of a protein that has only covalent bonding between amino acids is

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2° structure

3°structure

1° structure

4° structure

At room temperature, the vapour pressure of water and ether will be

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equal

different

zero

almost same

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

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

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water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

Oxidation of secondary alcohol produces

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Aldehyde

Ketone

Alkyl halide

Ester

Gases deviate from ideal behaviour at high pressure.Which of the following is correct for non-ideality?

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at high pressure the gas molecules move in one direction only

at high pressure the collisions between the gas molecules are increased manifold

a high pressure the volume of the gas become insignificant

at high pressure, the intermolecular attraction becomes significant

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

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

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

What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated

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2

12

0

2.7

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

what is the exact value of angle in BF3

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90

104.51

119.5

120°

At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in

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pressure

No. of moles

Volume

all of these

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 one pair has the same oxidation state of-Fe?

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FeSO4 and FeCl4

FeCl4and FeCl3

FeSO4 and FeCl2

Fe2(SO4)3 and FeSO4

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

Which of the following is not a property of enzymes?

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extraordinary speciffcity

reversibility of reactions

high efficiency

minimum activity at optimum T

The molecular speed Crms of gas is

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Independent of temperature

Proportional to the absolute temperature

Proportional to the square root of absolute temperature

Proportional to the square of absolute temperature

At constant pressure, if the original volume is 546 cm³at which temperature the volume of gas 552 cm³

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1°C

2°C

3°C

4°C

The respiration process taking place in animals depends upon a difference in:

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vapour pressure

osmotic pressure

partial pressure

atmospheric pressure

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

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Ethyl alcohol

AcetyI chloride

Acetamide

Methyl cyanide

At constant temperature, volume of given mass of a gas is inversely proportional to pressure on it. This is statement of

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Charles law

Boyle's law

Hooks law

Grahams law

Absolute temperature of a gas is proportional to:

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Rotational Kinetic energy

Translational Kinetic energy

Vibrational Kinetic energy

Potential energy

The protein component of enzyme ls called

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apoenzyme

proenzyme

holoenyme

co-enzyme

In a saturated solution of AgCl, the molar concentration of Ag+ and Cl- is 1.0x10(-5)M each. What is the value of Ksp

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1.0x10(-5)

1.0x10(-15)

0.1x10(-5)

1.0x10(-10)

The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

Which of the following statement is not true?

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The pressure of a gas is due to collision of the gas molecules with the walls of the container.

The molecular velocity of any gas is proportional to the square root of the absolute temperature.

The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.

Kinetic energy of an ideal gas is directly proportional to the absolute temperature.

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

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organic nature

H-bonding

molecular size

dipole-dipole forces

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

A molecule that has polar bonds but is overall non - polar

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IF

CCl4

PCI3

All

Identify the compound, which give iodoform test

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Methanol

3- Hexanol

Methyl ketone

Propionaldehyde

A solid has a sharp melting point slightly above room temperature and is a poor thermal and electrical conductor, its crystal classification by bond type is

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Ionic

Metallic

Molecular

Covalent

Geometry of simple molecule with sp2 hybridization

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Triangular planar

Trigonal

Square planner

Pyramidal

Formalin is used as:

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Fungicide

Germicide

Sterilizing of surgical instruments

All three

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

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180°

120°

90°

60°

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

6Na+ Fe2O3 -------- 3 Na2O+2Fe For above reaction, if you are provided with 230g Na and 320g Fe2O3, then limiting reactant is

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, Na

Na2O

Fe2O3

none of these

Which statement explains why the boiling point of methane is higher than that of neon?

[A_r:H.1:c,12:Ne,20]

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A molecule of methane has a greater mass than a molecule of neon

Molecules of methane form hydrogen bonds but those of neon do not

Molecule of methane have strongel intermolecular forces than those of neon

The molecule of methane is polar, but that of neon is not

Anthracene contains number of fused benzene rings

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1

2

3

4

The structure normally associated with ionic bonding is:

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a giant lattice

a simple molecule

a giant molecule

a regular arrangement of ions surrounded by a sea , or cloud, of electrons

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

Some substance are good conductors of electricity in both the solid and liquid states. These substance are generally:

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molecular solids

ionic substances

metallic substances

covalent network solids

Areal gas obeying Van der Waal's equation will resemble ideal gas ilf the:

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both a and b are large

both a and b are small

a is small and b is large

a is large and b is small

The most complex strueture a single polypetide can assume is

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1° structure

2°structure

3° structure

4° structure

For a particular halogen, the reactivity of alkyl halides

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remains same with C-increase

decreases with C-increase

increases with C-increase

decreases with C-decrease

The destiny of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to:

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Viscosity

Molar mass

Momentum

All of above

If v is the volume of one molecule of a gas under given conditions, then Van der Waals constant b is (N_Ais Avogadro number)

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The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

Which of the following is not a macromolecule?

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diamond

graphite

iodine

silica

Which one of the following will behave least like an ideal gas at high temperature and low pressure?

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hydrogen fluoride

helium

oxygen

carbon dioxide

Which of the following is a non-crystalline solids pair

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Diamond, wood

Glass, table salt

Wood, glass

Sucrose, glass