Question # 1

Which of the following is a strong acid

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CH3COOH

C2H5OH

HCOOH

Phenol

Which of the following statement about graphite is not true?

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The coordination number of carbon atoms is 4.

the carbon atoms are arranged layers.

the layers in graphite are attracted to each other weak forces.

the corbon atoms use only three of their four outer electrons for covalent bonding.

An element from the given below exists as discrete small molecules in the solid state. Which is that?

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Sodium

Silicon

lodine

lron

Which of the following ketone will not give iodoform test

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Methyl isopropyl ketone

Dimethyl ketone

Ethyl isopropyl ketone

2-hexanone

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

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

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AlO

AlO₂

Al₂O₃

Al₃O₂

The gases suddenly if these are allowed to expand:

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react

cool down

heat up

moved randomly

The value of van der Waal s constant a for gases CO₂, N₂, and SO₂, are 3.59 ,1.39, 1.36, and 6.17 atm dm⁶ mol^-2respectively the gas which can be most easily liquefied is

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CO₂

O₂

N₂

SO₂

What water freezes at 0∘ , Its density decreases dues to:

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cubic structure of ice

empty spaces present in the structure

change of bond lengths

change of bond angles

Boiling point of H₂O is higher than that of HF although F is more electronegative than O. It is due to

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stronger dipole dipole forces in H₂O

H₂O is neutral HF is acidic

H₂O is angular, but HF is linear

number of hydrogen bonds more in H₂Othan in HF

In NaCl cyrstal Na⁺ion is surrounded by how many ions of Cl^-

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4

6

8

10

Density of a gas increases by

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increasing value of R

decreasing value of R

increasing T

decreasing T

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

Which one is very weak acid

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HF

HCI

H2CO3

H2O

The boding which covalent molecules containing hydrogen and one of the small electronegative element such as O, For Mis called:

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ionic bonding

bridge bonding

H-bonding

metalic bonding

The typical range of the H-bonding is:

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1-2 kj/mol of bonds

5-25 kj/mol of bonds

500 kj/mol of bonds

Boiling point of water is higher (100°C) than that of ethanol (78.5°C) although both have hydrogen bonding. This is because

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water molecules are closely packed

water is more acidic than ethanol

ethanol is an organic liquid

number of hydrogen bonds are more in H₂O

Which of the following is soluble in water?

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СН3ОН

CCL4

CHCI3

CS2

The value of general gas constant R is derived from:

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Newton's Cooling law

Maxwell's law

Avogadro's law

Charle's law

One dm3 of H2 and O2: has different masses but no. of particles are

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same

H2 has greater

different

O2 has greater

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

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

Density of a gas is usually expressed in

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Kg m³

Kg dm³

g dm^-3

g cm^-3

The vapour density of a gas is 11.2.The volume occupied by 11.2 g of this gas at N.T.P is

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22.4 litres

11.2 litres

1 litre

2.24 litres

What are the S.I. units of excluded volume "b" in Vander Waal's equation

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dm³mol^-1

m³mol^-1

mol dm^-3

mol m^-3

Which of the following elements is most metallic

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Bi

sb

As

P

Which of the following transition metal forms colourless compounds in +4 oxidation state?

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Ti

Cr

Cu

Zn

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

Which one is not related with evaporation

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Continuous

Cooling

Exothermic

Spontaneous

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

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

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Hook's law

Graham's law

Bolye's law

Charle's law

Cyclobutane structure is categorized under

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Aromatic compounds

Aliphatic compounds

Alicyclic compounds

Heterocyclic compounds

Out of monochloro, monobromo and mongiodo derivatives of ethane, the mos reactive compound towards nucleophilic substitution will be

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C2H5Br

C2H5Cl

C2H5I

All are equally reactive

A basic buffer solution can be prepared by mixing?

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Weak acid and its salt with strong base

Weak base and its salt with strong acid

Strong acid and its salt with weak base

Strong base and its salt with strong acid

By convention, the standard heat of formation of all elements is assumed to be

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Zero

positive

Negative

Infinity

The forces of attraction between the solid atoms of helium are

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hydrogen boding

coordinate covalent bond

covalent bond

London dispersion force

Absolute temperature of a gas is proportional to:

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Rotational Kinetic energy

Translational Kinetic energy

Vibrational Kinetic energy

Potential energy

Which one the following gases is ideal at -200°C?

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N₂

He

both

none

In a cubic lattice a unit cell is shard equally by how many unit cells?

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4

2

6

8

R = 0.08205:

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atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

The decomposition of N2O4 to NO2 is carried out at 280°C in chloroform. When quilibrium is reached. 0.2 moles of N2O4 and 0.02 mole of NO2 are present in 1:1 ratio The equilibrium constant for the reaction N2O4------> 2NO2 is

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0.01

0.001

0.02

0.002

Equal masses of CH₄and O₂are mixed in a 10 dm³container at 25°C. The partial pressures of CH₄and O₂are in the ratio of

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1 : 2

2 : 1

1 : 1

2 : 3

Esterification of CH3COOH isreaction

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Acid base

Electrophilic

Redox

Nucleophilic

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

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62400

62.4

8.313

0.0821

Which one of the followings is resistant to oxidation under normal conditions

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Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

A certain buffer solution contains equal cone. of X- and HX. Ka for HX is 10(-8). The pH of buffer is

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3

11

8

14

Which one of the following is NOT a nucleophile

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NH2+

BF3

H2O

CH3-

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

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

What can be deduce about two gases which have the same molecular mass:

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They have same numbers of atoms in a molecule

They have same rate of diffusion

They have same boiling points

They have equal solubility in water at room temprature

Which of the following statement is correct if the intermolecular forces in liquids A,B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than 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 pressure

Low T and low P

Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to

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higher densities

higher molar masses

the chain, are more zig-zag

all are correct

When a metal rod is dipped in its one molar ionie solution

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Electricity is produced

Electricity is consumed

Redox reaction occurs

Potential difference is set up

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

which of the following is a typical transition metal?

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Sc

Y

Ra

Co

NaOH+HCI- NaCI+ H2O. Enthalpy change in the above reaction is called

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Enthalpy of reaction

Enthalpy of Neutralisation

Enthalpy of formation

Enthalpy of combustion

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.