Notesale: Turn your study into money

Document Preview

Extracts from the notes are below, to see the PDF you'll receive please use the links above

---

REVIEW EXAM IN CHEMISTRY
1
...
electrons and neutrons
b
...
protons and neutrons
d
...
Protons and Neutrons
...
Protons and
neutrons are made of quarks and held together by the strong force generated by gluon exchange between quarks
...
The number of moles of solute present in 1 kg of a solvent is called its
a
...
Molarity
c
...
Formality
Answer: A
...

Because molality is the property of a a solution that is defined as the number of moles
of solute per kilogram of solvent
...
The most electronegative element among the following is
a
...
Bromine
c
...
Oxygen
Answer: C
...


Fluorine is the most electronegative element and also the most reactive non-metal
...
The metal used to recover copper from a solution of copper sulphate is
a
...
Ag
c
...
Fe
Answer: D
...
Since iron (Fe) is more reactive than copper (Cu) it will be 'plated' with copper
when the metal iron is stuck in copper sulfate solution
...
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
a
...
s-electrons in Mg(Z = 12)
c
...
p-electrons in CI(Z = 17)
Answer: D
...
Number of d electron in Fe2+
= -5
...
The metallurgical process in which a metal is obtained in a fused state is called
a
...
Roasting
c
...
froth floatation
Answer: A
...


Smelting means melting with reduction

7
...
H2 at -73oC
b
...
N2 at 1,027oC
d
...
H2 at -73oC
...


Among the given gases, hydrogen at −50oC has maximum value of T/M and highest

8
...

The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life
and solidified into hard rock's called
a
...
Basalt
c
...
sedimentary rocks
Answer: C
...
The law which states that the amount of gas dissolved in a liquid is proportional to its partial
pressure is
a
...
Gay Lussac's law
c
...
Raoult's law
Answer: C
...
The proportionality factor is called
Henry's law constant
...
The main buffer system of the human blood is
a
...
H2CO3 - CO32c
...
NH2CONH2 - NH2CONH+
Answer: A
...
Bicarbonate buffer is the most important
buffer system in blood plasma (generally in the extracellular fluid)
...


11
...
Helium
b
...
Oxygen
d
...
Ozone
The ozone layer is a natural layer of gas in the upper atmosphere which protects
humans and other living things from the harmful ultraviolet (UV) rays of the sun
...
The most commonly used bleaching agent is
a
...
carbon dioxide
c
...
sodium chlorine
Answer: C
...
The nucleus of a hydrogen atom consists of
a
...
1 proton + 2 neutron

c
...
1 electron only
Answer: A
...
The electron
is bound to the nucleus by the Coulomb force
...
The heat required to raise the temperature of body by 1 K is called
a
...
thermal capacity
c
...
None of the above
Answer: B
...
It is expressed as calories per degree
...
The nuclear particles which are assumed to hold the nucleons together are
a
...
Positrons
c
...
Mesons
Answer: D
...
The mass of P4O10 that will be obtained from the reaction of 1
...
07 of oxygen
is
a
...
05 gram
b
...
05 gram
c
...
05 gram
d
...
05 gram
Answer: A
...
05 gram
of oxygen is
...
05 gram
...
33 gram of P4 and 5
...
The octane number of zero is assigned to
a
...
n-heptane
c
...
3-methyl octane
Answer: B
...


By definition, iso-octane is assigned an octane rating of 100 and heptane is assigned an

18
...
Ni
b
...
Cu
d
...
Ni
Although nickel is the preferred catalyst for hydrogenation of fats and oils, the use of other
metals such as palladium, platinum, ruthenium, and rhodium leads to products with less trans compounds
...
The most abundant rare gas in the atmosphere is
a
...
Ne
c
...
Xe

Answer: C
...
00015% of the crust
...
The Latin word formica means ant
...
this acid, in ancient times, was used to eliminate ant-hills
b
...
this acid was first obtained by the distillation of ants
d
...
The Latin word formica means ant
...
The ore which is found in abundance in India is
a
...
Fluorspar
c
...
Magnetite
Answer: A
...
The inherited traits of an organism are controlled by
a
...
Nucleotides
c
...
Enzymes
Answer: C
...
Two DNA chains attach to each other through
hydrogen bonds, forming a ladder structure that twists into a double helix
...
The heat energy produced when the human body metabolises 1 gram of fat is
a
...
1 KJ
c
...
29 KJ
Answer: A
...
What are the number of moles of CO2 which contains 16 g of oxygen?
a
...
5 mole
b
...
2 mole
c
...
4 mole
d
...
25 mole
Answer: A
...
5 mole
moles of it
...
So 16 g of O2 have 22 g of CO2 or 0
...
The main use of salt in the diet is to
a
...
produce in small amounts the hydrochloric acid required for the digestion of food
c
...
increase the solubility of food particles in water
Answer: B
...
The monomer of polythene is
a
...
ethylene

c
...
None of the above
Answer: B
...
The luster of a metal is due to
a
...
its high polishing
c
...
presence of free electrons
Answer: D
...
The number of water molecules present in a drop of water (volume 0
...
1
...
6
...
4
...
6
...
6
...
The most malleable metal is
a
...
Silver
c
...
Gold
Answer: D
...
A single gram can be beaten into a sheet of 1 square
meter, and an ounce into 300 square feet
...


30
...
Coconut oil
b
...
kerosene oil
d
...
pine oil

In froth floatation process, gangue particles are wetted by pine oil
...
The number of waves in n x 10th Bohr's orbit are
a
...
n
c
...
n3
Answer: B
...
The mass of one Avogadro number of helium atom is
a
...
00 gram
b
...
00 gram
c
...
00 gram
d
...
02 x 1023 gram
Answer: B
...
00 gram
mass of 4 grams
...
The items amenable to detection by soft x-rays are
a
...
lead in bullets

c
...
genuine coins from counterfeit coins
Answer: D
...
The material which can be deformed permanently by heat and pressure is called a
a
...
Thermoset
c
...
Polymer
Answer: B
...
The mass number of a nucleus is
a
...
the sum of the number of protons and neutrons present in the nucleus
c
...
a fraction
Answer: B
...
The inexpensive and commonly used variety of glass is called soda glass
...
was used initially for making bottles of soda(carbonated drink)
b
...
was initially used for storing sodium carbonate
d
...
is made using soda(sodium carbonate)

37
...
Hydrogen
b
...
Nitrogen
d
...
Hydrogen

38
...
N3- > O2- > F- > Na+
b
...
Na+ > O2- > N3- > Fd
...
The graphite rods in the nuclear reactor
a
...
produce neutrons
c
...
convert fast moving neutrons into thermal neutrons
Answer: C
...
The first metal used by man was
A
...


Copper

C
...
Bronze
Answer: B
...
A copper pendant discovered in what is now
northern Iraq has been dated about 8700 B
...
For nearly five millennia copper was the only metal known to
man, and thus had all the metal applications
...
The hydronium ion is
A
...


HO -

C
...
H3O+
Answer: D
...


42
...
Na
B
...


K

D
...
Cesium is the most electropositive element
...
The method that cannot be used for removing permanent hardness of water is
A
...


Distillation

C
...
Boiling
Answer: D
...


44
...
Which one of the following is the most
dangerous to handle?
A
...


100 years

C
...
01 minute

D
...
0
...
The gas used for artificial ripening of green fruit is

A
...


Ethane

C
...
Acetylene
Answer: A
...


46
...
Au
B
...


Ag

D
...
Ge

47
...
Cineole
B
...


Geraniol

D
...
cineole

48
...
HI
B
...


HCI

D
...
HF has the highest percentage of ionic character because F has the greatest electronegativity
...


49
...
its high electro negativity
B
...


availability of d-orbitals

D
...
its high electronegativity
50
...
Fe2O3
B
...


FeCO3

D
...
3H2O
Answer: A
...
The ionisation energy of hydrogen atom in the ground state is x KJ
...
5x/36
B
...


7
...
x/6
Answer: A
...
The major constituent of air is
A
...


carbon dioxide

C
...
Hydrogen
Answer: A
...
09% nitrogen, 20
...
93% argon, 0
...


53
...
silicon oxide
B
...


Zeolites

D
...
aluminium silicate is the main Chemical constituent of clay

54
...
Magnesite
B
...


Carnallite

D
...
Dolomite

55
...
Zn
B
...


Ag

D
...
Ag

56
...
02 x 1024CO molecules is
A
...


0
...


5 gram of molecule

D
...
5 gram of molecule

57
...
Orissa coast
B
...


West Bengal coast

D
...
Travancore coast

58
...
Nicotine
B
...


Caffeine

D
...
Caffeine is the main active constituent of tea and coffee
...


59
...
5
B
...


2

D
...
4 There are four isomeric alkenes of formula C4H8

60
...
coke
B
...


diamond

D
...
diamond
...
t

61
...
Bauxite
B
...


Haematite

D
...
Bauxite is the most common aluminum ore
...
The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an
example of
A
...


a condensation reaction

C
...
an elimination reaction
Answer: B
...
The number of electrons presents in H+ is
A
...


One

C
...
Three
Answer: A
...
Electrons are
negatively charged
...
So it has zero
electron
...
The hottest part of the gas flame is known as
A
...


dark zone

C
...
non-luminous zone
Answer: D
...
The human body is made up of several chemical elements; the element present in the highest
proportion (65%) in the body is
A
...


Hydrogen

C
...
Nitrogen
Answer: C
...


66
...
CH2CI is
A
...


functional group isomerism

C
...
Metamerism
Answerr: C
...
The half life period of an isotope is 2 hours
...
1/6
B
...


1/8

D
...
1/8

68
...
4
B
...


2

D
...
4

69
...
6 gram of silver (atomic weight = 108) are same as the
molecules in
A
...
8 gram of H2O
B
...


0
...
4
...
12 moles of KMnO4

70
...
New Delhi
B
...


Pune

D
...
Pune
The National Chemical Laboratory (NCL) is an Indian government laboratory based
in Pune, in western India
...
Equal masses of oxygen, hydrogen and methane are kept under identical conditions
...
2 : 16 : 2
B
...


1 : 16 : 2

D
...
Convert the mass into moles (use the formula n=m/Mr)
m = mass and Mr = Molecular weights
Molecular weights are 32(Oxygen), 2(Hydrogen), and 16(Methane), respectively
...
So, the number of moles would be:
n(O2) = x/32
n(H2) = x/2
n(CH4) = x/16
The ratio of their volumes is (O2) : (H2) : (CH4) = 1 : 16 : 2
72
...
the number of protons
B
...


the number of nucleons

D
...
the number of nucleons

73
...
1
B
...
3
D
...
4 Covalency of an atom in a covalent compound is the number of covalent bonds formed by an
atom
...
The formula C6H5-CO-CH3 represents
A
...
Acetic acid
C
...
Phenyl acetate
Answer: C
...
The metal that is usually extracted from sea water is
A
...
Na
C
...
Mg
Answer: D
...
The Metal is extracted from

seawater and brines by means of electrolysis, a process that requires the passing of a current through a
molten salt
...
The method of concentrating the ore which makes use of the difference in density between ore and
impurities is called
A
...
Leaching
C
...
magnetic separation
Answer: C
...
The inert gases are ____ in water
A
...
insoluble
C
...
None of these
Answer: A
...
The molecular formula of phosphorous is
A
...
P2
C
...
P4
Answer: D
...
The two main forms of phosphorus are white
phosphorus and red phosphorus
...
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development
of
A
...
metallurgy
C
...
discovery of elements
Answer: C
...
Who is regarded as father of modern chemistry?
A
...
Einstein
C
...
C
...
Raman
Answer: C
...
The most abundant element in the earth's crust is?
A
...
Nitrogen
C
...
Oxygen
Answer: D
...
What is metallurgy?
A
...


B
...

C
...

D
...

Answer: A
...


83
...
positrons
B
...
electrons
D
...
mesons
Nuclear particles responsible for holding all nucleons together are mesons
...
The most malleable metal is
A
...
silver
C
...
iron
Answer: C
...
A single gram can be beaten into a sheet of 1 square meter, and
an ounce into 300 square feet
...


85
...
viscosity
B
...
polarity
D
...
surface tension
Water drops, or, for that matter, the drops of any other liquid, are spherical in
shape due to a phenomenon called surface tension
...


86
...
polyvinyl chloride
B
...
phosphor vanadiu chloride
D
...
polyvinyl chloride

PVC used in the plastic industry stands for polyvinyl chloride
...
pH of blood is ?
A
...
4
B
...
7
...
4
Answer: C
...
4
The pH scale, ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline)
...
0, in the middle of this scale, is neutral
...
35 to
7
...
Usually the body maintains the pH of blood close to 7
...


88
...
Ammonium Sulphate
B
...
Ammonium Nitrate

D
...
Urea contains the maximum amount of nitrogen among the given options
...
Conduction band electrons have more mobility than holes because they are
A
...
experience collision less frequently
C
...
need less energy to move them
Answer: B
...
What is Calcium sulphate ?
A
...
blue vitriol
C
...
potash alum
Answer: C
...
Ozone is:
A
...
Paramagnetic
C
...
Diamagnetic
Answer: D
...
What among following is used to produce artificial rain ?
A
...
carbon monoxide
C
...
silver nitrate
Answer: C
...


93
...
marlic acid
B
...
lactic acid
D
...
Citric acid is a naturally-occurring organic acid present in multiple fruits and their juices
...
Permanent hardness of water is due to the presence of?
A
...
Calcium bicarbonate
C
...
Calcium sulphate
Answer: D
...
Atomic number of an element gives
A
...
the number of electrons in its atom
C
...
the total number of elementary particles in its atom

Answer: B
...
Iodine can be separated from a mixture of Iodine and Potassium Chloride by?
A
...
Sublimation
C
...
Sedimentation
Answer: B
...
This property of a solid changing directly into gaseous phase is known as sublimation
...
The chemical used as a fixer in photography is ?
A
...
sodium sulphate
C
...
ammonium sulphate
Answer: B
...
Popular salts are sodium thiosulfate—commonly called hypo—and ammonium thiosulfate—
commonly used in modern rapid fixer formulae
...
Rare gases are
A
...
di atomic
C
...
None of above
Answer: A
...
hence they are rare and monoatomic
...
Who is regarded as father of modern chemistry?
A
...
Einstein
C
...
C
...
Raman
Answer: C
...
Contact lenses are made from?
A
...
Teflon
C
...
Lucite
Answer: A

---