Question # 1

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

Choose an answer

critical temperature

absolute zero

liquefaction temperature

boiling point

The acidity of phenol is due to its

Choose an answer

Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

Super conductors are derived from compounds of

Choose an answer

P-block elements

Lanthanides

Actinides

Transition elements

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

Choose an answer

Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

In which molecule. all atoms are coplanar?

Choose an answer

CH4

BF3

NH3

PH3

Allotropic forms of carbon are:

Choose an answer

five

three

four

two

The standard electrode potential of hydrogen is arbitrarily taken at 298k is

Choose an answer

1.00volt

0.10 volt

0.00 volt

10.0 volt

The heat of hydrogenation of most of the alkene is about

Choose an answer

120 kJ/mol

100 kJ/mol

140 kJ/mol

105 kJ/mol

Which one is an isomorphic pair?

Choose an answer

NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

Group of element belongs to IIB group

Choose an answer

Zn. Cd. Hg

Cu. Ag. Au

Sc. Y. La

Ni. Pd. Pt

Which of the following salts would give the same products irrespective of whether its molten form or concentrated aqueous solution is electrolysed?

Choose an answer

Magnesium bromide

Magnesium sulphate

Copper sulphate

Copper chloride

Which of the following liquid has high vapour pressure?

Choose an answer

H₂O

ether

CH₃OH

C₂H₅OH

A student put two eggs A and B in HCL solution, After five minutes he took them out for weighing but egg dropped in water accidentally. The student was able to take it out after 30 minutes, He weighed it, Its weight was 40.33g. Weight of egg B was also 40.33g. Teacher told him that if both eggs have been dropped in water, the weight of egg B would have been:

Choose an answer

equal to that of egg A

less than that of egg A

greater than that of egg A

unaffected instead

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

Choose an answer

CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

Charles's law is only obeyed at which temperature scale

Choose an answer

Celsius

Kelvin

Fahrenheit

both A&B

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

Choose an answer

AlO

AlO₂

Al₂O₃

Al₃O₂

Hess's law is analogous to

Choose an answer

Law of heat summation

law of increasing entropy

Law of heat exchange

Ist law of thermodynamics

As gases can adopt the shape of the container. Therefore gases have:

Choose an answer

different shapes

fixed shapes

no fixed shapes

definite shapes

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

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

Choose an answer

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

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

Choose an answer

pressure

No. of moles

Volume

all of these

Which element is expected to show the greatest tendency to form some covalent compounds?

Choose an answer

aluminium

calcium

magnesium

sodium

Inside every fluorescent lamp there is present a:

Choose an answer

Gas

Plasma

Liquid

Solid

The pH of ideal buffer is

Choose an answer

10

7

Less than 7

0

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

Choose an answer

Obey gas laws.

Have definite volume.

Collide with the walls of container.

Collide with each other.

One atmosphere is equal ___________ Pascal

Choose an answer

760

101325

14.7

1.01325

Which of the following solids does not have a covalent bond?

Choose an answer

Silica

Copper

Diamond

Graphite

In dilatometric method is directly proportional to extent of reaction

Choose an answer

Change in concentration

Change in pressure

Chang in volume

Change in temperature

Correct order of intermolecular forces

Choose an answer

Gas < liquid < solid

Liquid < gas < solid

Gas < liquid < solid

Gas = liquid = solid

Which one is not postulated in the kinetci molecular theory among the following?

Choose an answer

molecules are in chaotic motion

molecules of all the gases have same size and same mass

the volume of the molecules is negligible

all molecular collisions are elastic

Indicate the number of open chain isomers of C6H14

Choose an answer

4

5

6

7

2,4,6-Trinitrophenol is commonly called as

Choose an answer

Phthalic acid

Tartaric acid

Malonic acid

Picric acid

Which of the following is not the application of plasma

Choose an answer

Fluorescent light bulb

Removal of hazardous chemical

Neon signs

Corrosion effective

Among solids,the highet melting point is exhibited by

Choose an answer

Covalent solids

Ionic solids

Pseudo solids

Molecular solids

The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute

Choose an answer

Oxidation

reduction

Redox reaction

electrolysis

Which ion has maximum number of unpaired electrons in 3d subshell and shows maximum paramagnetic behavior?

Choose an answer

Cr+3

Ni+2

Co+2

Fe+3

The solubility product is only applicable for those substance whose molar concentrations is

Choose an answer

0.01

Equal to 1

Less than 0.01

Greater than 10

How many secondary carbon atoms are present in Methylcylopropand

Choose an answer

1

2

3

0

Which one of the following molecules show maximum hydrogen bonding?

Choose an answer

H₂O

H₂Se

H₂S

HF

Ethanol reacts with sodium metal to liberate

Choose an answer

CO2 gas

CO gas

H2 gas

Steam

Which of the following is not a category of proteins based upon their function?

Choose an answer

genetic

Regulatory

nucleo

structural

In an elimination reaction a more substituted alkene is formed due to the stability associated with

Choose an answer

Free radical

transition state

Activated complex

Carbocation

Deep sea divers take oxygen with:

Choose an answer

A heavy gas

A lighter gas

An inert gas

All of above

which of the following is a typical transition metal?

Choose an answer

Sc

Y

Ra

Co

Covalent bonds are

Choose an answer

directional

Bidirectional

Multidirectional

Non directional

The volume of a gas that is occupied by its one mole at STP is called

Choose an answer

total volume

normal volume

molar volume

atomic volume

According to Avogadros law 1 mole of gas at S.T.P has a volume of

Choose an answer

22.4 dm³

24 dm³

24000 cm³

2m³

The Kw. of water at 25 C° is given by

Choose an answer

10(-7)

10(-10)

10(-12)

10(-14)

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

Choose an answer

Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

The unit of pressure ______ is commonly used by meteorologists

Choose an answer

mm of Hg

Kilopascal

Millibar

Pound per square inch

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

Choose an answer

Viscosity

Molar mass

Momentum

All of above

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

Choose an answer

Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

The order of reactivitv of alksI halides towards nucleophile is

Choose an answer

RI>RBr RF>RCI

RF>RCI>RBr>RI

RI>RBr> RCI>RE

RF>RBr>RCI>RI

Which one increases by common ion effect except?

Choose an answer

Crystallization

Solubility

Association of ions

All of these

The number of atoms in 0.004 g of magnesium is close to

Choose an answer

24

2 x 10²⁰

10²⁰

6.02 x 10²³

NH₃can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens

Choose an answer

nitrogen in NH₃has only one ions pair of electrons which can make one H-bond

ammonia is a base

ammonia is a weak acid

it ionizes to give one H⁺

Phenol can be diatingushed from ethyl alcohol by all of the following reagents except

Choose an answer

lodoforrn test

Na

Br2 /H2O

NaOH

1, 3, 5-Pentanetriol has secondary carbon

Choose an answer

3

1

2

Zero

ln ethyl alcohol, the bond that undergoes heterolytic cleavage most readily is

Choose an answer

C-C

C-O

C-H

O-H

By increasing pressure two times and decreasing temp. two times the volume of gas

Choose an answer

Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

The electrical conductivity of the metals decreases with the increasing temperature. This is because

Choose an answer

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

Which one of following statement about three about three states of matter is incorrect?

Choose an answer

in solids the particles vibrate about fixed positions

energy is released when a gas turns back to a liquid

particles in gases move in a random manner

the closer particles are together, smaller the force of attraction between them