Question # 1

The quantum yield of a Photo chemical reaction in

Choose an answer

Always less than unity

Always equal to unity

Always greater than unity

Can have any value > 0 depending on the reaction

In which of the following characteristics does hydrogen resemble halogens.

Choose an answer

Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

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 reverse of photo chemical reaction is called.

Choose an answer

Phosphorescence

Chemiluminescence

Fluorescence

Photscnaitization

H-Bonding also ox in ling system like

Choose an answer

Protein

DNA

Botha A and B

None of above

The bond length is measured by

Choose an answer

X-ray diffraction

Neutron diffraction

Microwave spectroscopy

All of above

Which of the following statements is not related with joule Thomson effect.

Choose an answer

Joule Thomson is 0 isenthalpic in nature

H2 and He show heating effect

All gases show change in temperature

The change in temperature depends on initial temperature and nature of the gas.

Joule Thomson coefficient is defined as meo= (op/oT)H

Natural fertilizers are materials derived from

Choose an answer

Plants

Animal

Algae

All of above

Electron gas theory is able to explain

Choose an answer

Metallic lusture and optical properties

Malleability and ductility

High electrical and thermal conductivity

All of the above

In radial direction the thermal conductivity of a nano tube is ______ watt/(m.k)

Choose an answer

3500

385

0

350

Formula of orthophosphoric acid.

Choose an answer

H2PO4

H3PO3

H3PO2

H4P2O5

Transition elements, in general exhibit the following properties, except one Name that property.

Choose an answer

Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

The bond formed by complete transfer of electrons from electropositive to more electronegative atom is called.

Choose an answer

Ionic bond

Covalent bond

Mettalic bond

Co ordinates bond

The substance that can form the glassy non-crystalline structure is called.

Choose an answer

Stabilizers

Fluxes or modifiers

Formers

None of these

The temperate of a gas below which only the gas cools when allowed to expand is know as.

Choose an answer

Inversion temperature

Ideal temperature

Critical temperature

Joule Thomaon temperatu4re

In which of the following compound valency of carbon in 4 but its oxidation number is zero

Choose an answer

Methane

Carbon dioxide

Carbon monoxide

Formaldeyde

The noble gas which was discovered first in the sun and then on the earth is.

Choose an answer

Helium

Neon

Argon

Xenon

Which of the following solution has pH= 11?

Choose an answer

1 X 10^-11 m NaOH

1 x 10^-11 m HCl

1 x 10^-3 M NaOH

1 X 10 ³ M NaOH

Both the elements shows allotropy

Choose an answer

B & Ai

B & Si

Al & Si

Any of above

Monomer of natural rubber is

Choose an answer

1,3-Butadiene

2-Methyl -1,3-butadiene

1,2 -Butadiene

1,3 - Pentadiene

The statement that heat cannot flow spontaneously from a colder to a hotter body is the result of.

Choose an answer

The first law of thermodynamics

The second law of thermodynamics

The third law of thermodynamics

Henry's law

Which of the following proportion is associated with the covalent nature of the compound.

Choose an answer

It conducts electricity in molten stater or aqueous state

It is a non electrolyte

It has high m.p.

It is a compound of a metal and non metal.

In whihc period, the element with least ionization enthalpy belong to

Choose an answer

Group I

Group 2

Group 17

Group 18

Which of the following is not correct criteria for an idea solution.

Choose an answer

Enthalpyh of mixing = 0

Volume of mixing = 0

Free energy of mixing = 0

Obeys Reoult's law

The pH Value 4.2 is of

Choose an answer

Vinegar

Lemons

Oranges

Tomatoes

The atomic number of Potassium is 19 and that of manganese is 25. Although the coloured of MnO4 is dark violet yet the K+ is colourles.. This is due to the fact that

Choose an answer

Mn is a transition element while K+ is not

[MnO4]is negatively charged while K+ has a positive charge

The effective atomicnumebr of Mn is [MnO4] is 26 while for K+ the atomic number is 18

The Mn in a high positive oxidation state allows charge transfer transitions

An example of acyclic monotterpenoid is

Choose an answer

a -pinene

Camphor

Geranial

Citral

Which of the following has the maximum ionic character.

Choose an answer

HF

HCl

HI

HBr

Which of the following process is involved in nitrogen flotation

Choose an answer

Non symmetric fixation of nitrogen

Fixation by soil bacteria

Fixation by yeast

Fixation by blue green algae

All above

Aluminium does not corrode as does iron because.

Choose an answer

AI does not react with O2

a-protective layer of Al2O3 forms on the metal surface

AI is harder to oxidize than is Fe

Fe gives chathodic protection to AI

A general trend in the properties of elements of carbon family shows that with increase in atomic number.

Choose an answer

The tendency towards concatenation increases

The tendency to show +2 oxidation state increase

Metallic character decreases

The tendency to form complexes with convalency higher than four decreases.

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