Question # 1

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

Which of the following is not a property of crystalline solid

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geometric shape

cleavage plane

anisotropy

isomerism

Which of the following has isomorphous structure with MgO

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NaF

S

Sn

N

The working condition/s for SHE

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1atm pressure

1M H-solution

298K temperature

All of these

The average bond energy of C-Br is

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228 kJmol-1

250 kJmol-1

200 kJmol-1

290 kJmol-1

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

At 100 atm, CH₄ develops:

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Ideal attitude

Non-ideal attitude

Serious attitude

Laughing attitude

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

If 250 cm³of hydrogen gas is cooled from 127°C to -73°C at constant pressure then new volume of gas is ______ dm³

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0.25

0.375

0.125

0.0625

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

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 volume occupied by 1.4g of N2at STP is:

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2.24 dm3

1.12 dm3

112 cm3

22.4 dm3

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

The volume of a real gas

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is constant

increases with T decrease

becomes zero at absolute zero

never becomes zero

Gases exert pressure on walls of container because the gas molecules:

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Obey gas laws.

Have definite volume.

Collide with the walls of container.

Collide with each other.

If the volume of 2 moles of an ideal gas at 540 K is 44.8 litre then its pressure will be

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1 atmosphere

2 atmosphere

3 atmosphere

4 atmosphere

There are three different substances argon hydroiodic acid and hydroiodic acid.

the correct sequence in which the boiling point increases is:

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HI > Ar > HCI

Ar < HCI < HI

HI > HCI > Ar

HCI < HI < Ar

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

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^{Primary Structure}

Secondary Structure

Tertiary Structure

Quaternary Structure

Ethyl alcohol reacts with PCL and produces:

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Haloalkane

Alkyl halide & H3PO3,

Alkyl halide & POCl3

Alkyl halides &H3PO4.

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

Acetone reacts with HCN to form a cyanohydrin. It is an example of

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Nucleophilic addition

Electrophilic substitution

Electrophilic addition

Nucleophilic substitution

The kinetic energy of three moles of gas is:

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3/2 RT

3 RT

1/2 RT

2 RT

Polarity of a molecule is expressed in terms of

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Bond strength

Dipole moment

Bond length

Shape

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

The attracted forces which are created due to repulsion of electronic cloud of the molecules are:

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ion-dipole forces

dipole-dipole forces

dipoles-induced dipole forces

instantaneous dipole-induced dipole

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

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

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

The process of effusion is best understood by law

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Grahams

Boyle s

Charles s

Avogadro s

What is the sequence of electron take up and removal from 4s orbital a transition metal in 3d series?

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Enters first, leaves after 3d electrons removal

Enters after 3d electrons, leaves after 3d electrons

Enters after 3d eleetrons, leaves first

Enters first and leaves first

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

Which reactant does hnof liberate water on reaction with alcohol

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NH3

K2Cr2O7/15H2O

HCI

PCI3

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

Combustion analysis is performed for the determination of

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Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

Which is a good nucleophile as well as a good leaving group?

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F-

Cl-

Br-

I-

What is the mass of 10²⁰molecules of CO₂at STP?

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7.3 x 10^-3g

7.9 x 10^-3g

3.2 x 10^-3g

4.9 x 10^-3g

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

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Esterification

Salt formation

Reaction with PCI5

Reaction with SOCI2

The rate of diffusion of hydrogen gas is three times than that of an unknown gas at same temperature and pressure than the molar mass of unknown gas is

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32

18

16

27

Formalin is used as:

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Fungicide

Germicide

Sterilizing of surgical instruments

All three

The ionization energy of hydrogen atom is

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Zero

131.3kJmole

13.13kJ/mole

1313kJ/mole

The total K.E. of one mole of an ideal gas is given by:

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1/2 RT

3/2 RT

1/2 KT

3/2 KT

Evaporation causes

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High temperature

High pressure

Cooling

Vapour

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

Smell of cooking gas during leakage from gas cylinder is detected because of the property of:

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Effusion

Evapotration

Diffusion

Conduction

The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

The density of methane at 2.0 atmosphere pressure at 27°C is

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0.13 gL^-1

0.26 gL^-1

1.30 gL^-1

26.0 gL^-1

Which of the following is a base according to lowery Bronsted concept?

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I-1

HCl

H3O+

NH4+1

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

The highest temperature at which a substance can exist as a liquid is called its:

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Critical temperature

Zero temperature

Absolute temperature

None of above

The nature of l₂crystals are

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Metallic

Covalent

Ionic

Molecular

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

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37

80

8

52

Which value is designated as absolute zero or zero of the Kelvin scale?

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-273.15°C

-173.15°C

273°C

none of these

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

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89.3 g

36.1 g

125 g

127 g

At higher temperature isotherm moves away from y-axis because of increase in

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Pressure

Number of moles

Volume

Mass

Which of the following liquid has highest bolling point

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HCI

HBr

H2O

Br2

d-d transition cannot be observed in

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Cr

Cu

Mn

Zn

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Correct statement about Nucleophilic substitution bimolecular is

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Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

Under which condition CO has the maximum molar volume

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high T and P

Low T and High p

high T and low P

Low T and low P

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