Question # 1

Reaction in which molecules absorbing light do not themselves react but induce other moleculaes to react are called.

Choose an answer

Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

Enantiomers have which of the following characteristics.

Choose an answer

Rotate ordinary light

Have the same melting point

Are superimposable mirror images

React with optically active molecule at the same rate

Which of the following acids acts as acid waste from coal mines.

Choose an answer

HCl

HNO3

CH3COOH

H3PO4

The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called.

Choose an answer

Free energy

Threshold energy

Activation energy

External energy

Which is major component of Bordeaux mixture.

Choose an answer

Copper sulphate

Sodium chloride

Calcium chloride

Magnesium sulphate

The electrical resistance of stainless steels can be as much as______ time that of carbon steel.

Choose an answer

5

6

10-

15

The force responsible for dissolution of ionic compounds in water are

Choose an answer

Hydrogen bonds

Ion dipole forces

Ionic bonds

Van Der Waal forces

A considerable number of atoms pertaining to the surface_____ with the decreasing the particle size.

Choose an answer

Increase

Decrease

No effect

Both a and b

Which type of polymers the Vulcanised rubbers is.

Choose an answer

Linear

Cross jinked

Branch chain

Any one of these

Which of the following is not correct.

Choose an answer

Rusting of iron can be stopped by increasing the concentration of CO2 in water

Rusting of iron is electrochemical in nature.

Rusting of iron takes place in moist air

Rusting of iron produces hydrated iron (III) oxide

The compound contains two types of X and Y its crystal structure is a cubic lattice with X-atoms at the corners of the unit cells and Y-atom t the body centre, The simplest formulae of this compound is.

Choose an answer

X2Y

XY

XY2

X8Y

Transition metal possess

Choose an answer

Definite color

Catalytic power

Both A and B

None of above

1 meter = ___________ nm

Choose an answer

10⁹

10^-9

10¹⁰

10^-10

Which of the following statements is not related to the decomposition phenomenon occurring in nature.

Choose an answer

Decomposition is due to autotrophic organisms

Decomposition involves bacteria and fungi

During decomposition organisms carry out specific reactions

Many species of decomposer are present in the biosphere

A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .

Choose an answer

2

1

0

3

Wlhich of the following can act as a protective colloid

Choose an answer

Gelatin

Silica gel

Oil in water emulsion

All three

Which of the following equations represent linear free energy relationship.

Choose an answer

Hammett equation

Taft equation

Helmholtz equation

Differential equation

Which of the following molecules have centre of symmetry.

Choose an answer

H2O

HCl

CO2

H2SO4

During the preparation of ethane by Kolbe's electrolytic method using inert electrodes the pH of the electrolyte.

Choose an answer

Increases progressively as the reaction proceeds

Decreases progressively as the reaction proceeds

Remains constant throughout the reaction

May decrease if the concentration of the electrolyte is not very high

Which of the following substance act as photochemical oxidant

Choose an answer

Ozone

NOx

peroxyacetyl nitrate

All above

Which of the following techniques is used for cleanup of samples prior to introduction into chromatographic column.

Choose an answer

Paper chromatography

TLC

Solvnent extraction

Solid phase extraction

Both C and D

The dimensions for first order rate constant are.

Choose an answer

s-1

s mol-1

mol-1 s-1

s

Which of the following statement is not true regarding Open Hearth process.

Choose an answer

No iron is lost

The process is economical and simple

Steel obtained is of high quality

Scrap iron cannot be used in this process.

Which of the following methods is used in qualitativ eanalysis.

Choose an answer

Physical method

Chemical method

Instrumental method

All above

Iodine is a grey black solid and its vapours are in color

Choose an answer

Grey

Black

Yellow

Violet

Which of the following statement is not true in case of catalytic reforming.

Choose an answer

High temperature results in loss of reformate yield

High naphthenic stock require high space velocity

Presence of water decrease the hydrocracking activity.

None of above

The angle between corresponding planes forming the external surfaces of the crystal remains constant for a given substances This is known as.

Choose an answer

Steno's law

Henry's law

Bragg law

Pascal law

Deviation in a particular measurement is the difference between the measured value and the average value The arithmetic mean of the different deviations observed in several measurements of the same quantity is known as.

Choose an answer

The standard deviation

The average deviation

Relative mean deviation

variance

Fluorine is.

Choose an answer

Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

Which of the following salt is water insoluble.

Choose an answer

K2SO4

Na2SO4

BaSO4

None of abvoe

The percentage of nitrogen in ammonium sulphate is__________%

Choose an answer

27

21

23

19

More Classes

Other Links

PPSC Chemistry Full Book Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer