Question # 1

With the increase of atomic numebr , the number of electron in an atom also.

Choose an answer

Decreases

First increases then decreases

Increases

None of the above

What will happen if the rates of forward and reverse reactions are very high

Choose an answer

The reaction will be practiclly irreversible

The equilibrium point will reach very soon

The equilibiurm point will reach very late

The reaction will not attain the state of dynamic equilibrium

A bond pair is covalent molecules usually has.

Choose an answer

One electron

Two electron

Three electron

Four electron

Covalent Bond involves the

Choose an answer

Sharing of electrons

Repulsion of electrons

Acceptance of electrons

Donation of electrons

Elements of a period show properties.

Choose an answer

Same

Different

Both a and b

None of these

Elements with atomic no .58 to 71 are called.

Choose an answer

Actinides

Lanthanides

Both a and b

None of these

Whcih one of the following in as electron deficient molecule.

Choose an answer

NH3

O2

BF3

N2

The percentage of ²³⁸ U ₉₂ found in nature.

Choose an answer

97%

0.72%

98%

1.5%

The reaction in which the products can recombine to formreactants are called.

Choose an answer

Reversible Reaction

Irreversible reactions

Decomposition reactions

Addition reactions

Numbr of hydrogen atoms present in 18 g of water.

Choose an answer

2 x NA

N_A

3 x N_A

1/2 N_A

40 g of H₃PO₄ contains numebr of moles

Choose an answer

0.58 g

4.8 g

5.8 g

0.408 g

Bond energy of C-C is.

Choose an answer

200 KJmol^-1

452 KJmol^-1

300 KJmol^-1

355 KJmol^-1

Which one of the followoing is the Hardest coal.

Choose an answer

Peat

Lignite

Bituminous

Anthracite

Aromatic compounds are given this name because of;

Choose an answer

smell they have

slippery touch they have

bitter taste they have

sour taste they have

If Qc < Kc the reaction goes in:

Choose an answer

Forward

Reverse

At equilibrium state

None

Coal having 90% carbon contents is called.

Choose an answer

Peat

Lignite

anthracite

bituminous

Blast furnace usually used for the metallurgy of.

Choose an answer

Iron

Copper

Aluminum

Both a and b

Main component of natural gas is

Choose an answer

Methane

propane

Butane

Propene

Fructose contain group.

Choose an answer

Ketone

Aldehyde

Alcoholic

Alkyl

Condensed formula of ethane is

Choose an answer

C₃Cl₈

C₂Cl₆

H₃CCH₃

None of these

Who proposed "Law of mass action"?

Choose an answer

Newton

Boyle

Guldberg and waage

Lavoisier

Which of the following in insoluble in water.

Choose an answer

Benzene

NaCl

KCl

All of them

Solvent extraction is an equilibrium process and is controlled by.

Choose an answer

Law of mass action

The mount of solvent used

The amount of solute

Distribution law

The molar boiling point constant is the ratio of the elevation of boiling point to .

Choose an answer

Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

The electrode reaction of a voltaic cell can be reversed when

Choose an answer

Concentrations of solutions are changed

Temperature is increased

Electrodes are interchanged

Electric circuit is employed to supply the source of electricity

When water freezes at 0°C, its density decreases due to

Choose an answer

Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

What is the mass of aluminium is 204 g of the aluminum oxide Al2O3.

Choose an answer

26 g

27 g

54 g

108 g

Solvent extraction is an equilibrium process and it is controlled by.

Choose an answer

Law of mass action

The amount of solvent used

Distribution law

The amount of solute

Total pressure of mixture of two gases is.

Choose an answer

The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

The pressure of oxygen inside the bomb calorimeter is.

Choose an answer

100 atm

50 atm

25 atm

20 atm

In order to mention the B.P of water at 110 ^oC the external pressure should be.

Choose an answer

Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

When a reaction occurs in many steps than the slowest step is.

Choose an answer

Mechanism step

Rate determining step

enthalpy determining step

None of the above

Which substance have delta E = Delta H and no pressure - volume work.

Choose an answer

Liquids only

Solids only

Gases only

Liquids and solids

For which mechanisms, the first step involved is the same.

Choose an answer

E2 and E2

E2 and SN2

SN1 and E2

E1 and SN1

Which of the following element is not present in all proteins

Choose an answer

Carbon

hydrogen

Nitrogen

Sulphur

which one is not fossil fuel

Choose an answer

Petroleum

Natural gas

Coal

Alcohol

Ethanol can be converted into ethanoic acid by.

Choose an answer

Hydrogenation

Hydration

Oxidation

Fermentation

Which of the following lipids does not have glycerol backbone.

Choose an answer

Fat

Oil

Cholesterol

Phospholipid

Which compound is the most reactive

Choose an answer

Benzene

Ethene

Ethane

Ethyne

Ecosystem is smaller unit of

Choose an answer

Lithosphere

Hydroshpere

Amosphere

Biosphere

In which country first of all paper was invented

Choose an answer

USA

China

Egypt

Germany

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms

Choose an answer

Two

Three

One

Four

Boiling point range of petroleum ether.

Choose an answer

5- 20 ^oC

10- 30^oC

20- 60^oC

30- 90^oC

Which of these polymers is an addition polymer

Choose an answer

Nylon 6, 6

polystyrene

Terylene

epoxy resin