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(Q.11) Metals react
with dilute sulphuric acid to form:
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(a) Metal hydroxide and sulphur trioxide
(b) Metal sulphite and water
(c) Metal sulphide and sulphur dioxide gas
(d) Metal sulphate and hydrogen gas
(b) Metal sulphite and water
(c) Metal sulphide and sulphur dioxide gas
(d) Metal sulphate and hydrogen gas
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(Q.14) The metal
extracted from calamine ore is-
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(Q.15) Which of the
following is true for ionic compounds?
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(a) These compounds have low melting points and boiling points.
(b) These are soluble in organic solvents.
(c) These are good conductors of electricity.
(d) These do not conduct electricity.
(b) These are soluble in organic solvents.
(c) These are good conductors of electricity.
(d) These do not conduct electricity.
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(Q.16) Metals react
with nonmetals to form ionic compounds by-
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(Q.17) Which of the
following compound is soluble in ether?
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(Q.18) Galvanization is
a method of protecting steel and iron
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(a) By coating them with a thin layer of zinc
(b) By greasing the layer
(c) By anodizing
(d) By making alloys
(b) By greasing the layer
(c) By anodizing
(d) By making alloys
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(Q.19) A homogeneous
mixture of two or more metals, or a metal and a non-metal is termed as
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(Q.20) Corrosion of
iron takes place in the presence of-
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(Q.21) Reaction of
metal oxides with Aluminium is-
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(a) Highly exothermic
(b) Highly endothermic
(c) Neither exothermic nor endothermic
(d) Not possible
(b) Highly endothermic
(c) Neither exothermic nor endothermic
(d) Not possible
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(Q.22) In electrolytic
method of refining of metals
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(a) Anode is made of pure metal
(b) Cathode is made of pure metal
(c) Cathode is made of impure metal
(d) Anode is always made of graphite.
(b) Cathode is made of pure metal
(c) Cathode is made of impure metal
(d) Anode is always made of graphite.
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(Q.23) Sulphide ores
are converted into oxides by
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(Q.24) Carbonate ores
are converted into oxides by
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(Q.25) Which type of
bond is present in CCl4?
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(Q.26) A non-metal used
to preserve food material is-
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(Q.27) A substance from
which a metal can be profitably extracted is called:-
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(Q.28) A metal used for
galvanizing iron is-
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(Q.29) Which of the
following can conduct electricity?
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(Q.30) Metals does not
liberate hydrogen gas on reaction with
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(Q.31) Na2O
and K2O are
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(Q.32) The coreect
decreasing order of reactivity of Al, Mg,Zn and Fe is
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(Q.33) Best conductor
of electricity is
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(Q.34) Metals conduct
heat because:-
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(a) Its atoms gain energy on heating, vibrate more vigorously
and transfer the energy to the adjacentelectrons.
(b) Heating causes expansion that in turn conducts the heat.
(c) Heating is done all over the metal.
(d) Heating causes contraction that in turn conducts the heat.
(b) Heating causes expansion that in turn conducts the heat.
(c) Heating is done all over the metal.
(d) Heating causes contraction that in turn conducts the heat.
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(Q.35) Define ores.
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(Q.36) What are alloys?
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(Q.37) What chemical
process is used for obtaining a metal from its oxides?
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(Q.38) Define a
chemical bond.
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(Q.39) Which metal foil
is used in packing of some medicine tablets?
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(Q.40) Define
corrosion.
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(Q.41) What is flux?
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(Q.42) What are the
metals?
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(Q.43) What happens
when metals react with acids?
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(Q.44) What are
amphoteric oxides?
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(Q.45) Which out of the
following is not found in a free state?
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(Q.46) Aqua regia
consists of HCl and HNO3 in the ratio:
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(Q.47) Themetal which
burns in air with a dazzling white flame is
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(Q.48) Name two metals
which are found in the nature in free state.
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(Q.49) What do you
understand by activity or reactivity series of metals?
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(Q.50) Name two metals
which are found in nature in the free state.
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(Q.51) ____ is the most
ductile metal.
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(Q.52) Name the
non-metal which conducts electricity.
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(Q.53) What do you
understand by activity or reactivity series of metals?
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(Q.54) The arrangement
of phosphorous, silicon, oxygen and sulphur in the order of their abundance
in earth’s crust is
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(a) phosphorous>silicon>oxygen>sulphur.
(b) oxygen>sulphur>phosphorous>silicon.
(c) oxygen>silicon>phosphorous>sulphur.
(d) sulphur>phosphorous>silicon>oxygen.
(b) oxygen>sulphur>phosphorous>silicon.
(c) oxygen>silicon>phosphorous>sulphur.
(d) sulphur>phosphorous>silicon>oxygen.
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(Q.55) The non-metals
can be solid, liquid and gaseous and are generally soft but hardest known natural
substance diamond is also non-metal having melting point of about
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(Q.56) Pair of metals
that have very low melting points (less than 300C) are
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(Q.57) One of the
following that is an amphoteric oxide is
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(Q.58) The Al2O3
reacts with sodium hydroxide to form
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(Q.59) Zinc oxide
reacts with sodium hydroxide to form sodium zincate and water. The sodium
zincate formed is
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(Q.60) The iron metal
in Fe3O4 is present as
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(a) Fe(II) ions.
(b) Fe(III) ions.
(c) Simple iron atoms with no charge.
(d) Combination of Fe(II) and Fe(III) ions.
(b) Fe(III) ions.
(c) Simple iron atoms with no charge.
(d) Combination of Fe(II) and Fe(III) ions.
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(Q.61) Arrangement of
sodium, magnesium, calcium and potassium in the order of increasing abundance
in earth’s crust is
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(a) Sodium>magnesium>calcium>potassium.
(b) Magnesium>calcium>potassium>sodium.
(c) Calcium>potassium>sodium>magnesium.
(d) Calcium>sodium>potassium>magnesium.
(b) Magnesium>calcium>potassium>sodium.
(c) Calcium>potassium>sodium>magnesium.
(d) Calcium>sodium>potassium>magnesium.
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(Q.62) The metals lose
their shine or brightness on keeping in air for a long time and acquire a
dull appearance due to
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(a) the disintegration of their molecules into smaller
components.
(b) formation of ions in their reactions with moisture.
(c) formation of free radicals on intermolecular interactions.
(d) the formation of oxides, carbonates and sulphides on their surfaces due to slow reactions with air.
(b) formation of ions in their reactions with moisture.
(c) formation of free radicals on intermolecular interactions.
(d) the formation of oxides, carbonates and sulphides on their surfaces due to slow reactions with air.
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(Q.63) The metal that
forms oxidesinstead ofhydroxides, on reaction with water in any form (liquid
or steam) is
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(Q.64) The component of
atmospheric air whose presence reduces the rate of combustion and makes it
safer for living beings is
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(Q.65) On the basis of
the vigour of their reaction with steam, the zinc, magnesium, iron and
aluminium can be arranged as
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(Q.66) All the mineral
acids except one evolve hydrogen gas on reaction with reactive metals. This
exceptional acid is
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(Q.67) Aquq-regia is a
freshly prepared mixture of concentrated nitric acid and concentrated hydrochloric
acid in the ratio
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(Q.68) The commonly
occurring metal iron is a heavy substance having high density. Its exact
density is
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(Q.69) The highly
unreactive metal gold can be dissolved in
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(Q.45) Colour of the
fumes of nitrogen dioxide (NO2) is:
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(Q.46) Chemical used in
the photography is:
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(Q.47) The rusting of
iron is
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(a) an oxidation reaction.
(b) a reduction reaction.
(c) a redox reaction.
(d) a double decomposition reaction.
(b) a reduction reaction.
(c) a redox reaction.
(d) a double decomposition reaction.
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(Q.48) When a piece of
magnesium metal is placed in blue coloured copper sulphate solution, the
colour of solution fades due to the formation of
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(Q.49) The chemical
reaction between sulphur dioxide gas and acidified potassium dichromate is
characterized by a change in colour from
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(Q.50) The chemical
reaction between quicklime and water to form slaked lime is characterized by
rise in temperature. Such reactions are called
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(a) endothermic reactions.
(b) exothermic reactions.
(c) isothermal reactions.
(d) adiabatic reactions.
(b) exothermic reactions.
(c) isothermal reactions.
(d) adiabatic reactions.
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(Q.51) In the following
oxidation-reduction reaction
 , the reducing agent is |
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(Q.52) The reactions
that take place with the fall in temperature are called endothermic
reactions. One example of endothermic reactions is
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(a) reaction between barium hydroxide and ammonium chloride.
(b) reaction between zinc granules and dilute sulphuric acid.
(c) reaction between quicklime and water.
(d) respiration by human beings.
(b) reaction between zinc granules and dilute sulphuric acid.
(c) reaction between quicklime and water.
(d) respiration by human beings.
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(Q.53) The reaction
amongst the following in which a black substance changes to reddish brown
substance is
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(a) 
.
.
(b)
.
(c)
.
(d)
.
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(Q.54) When an iron
object is left in damp air for a considerable time, it gets covered with a
red-brown flaky substance called “rust”. The rust is chemically
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(a) hydrated iron oxide.
(b) hydrated iron carbonate.
(c) hydrated iron sulphate.
(d) hydrated iron oxalate.
(b) hydrated iron carbonate.
(c) hydrated iron sulphate.
(d) hydrated iron oxalate.
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(Q.55) The sign for
heating in a balanced chemical equation is
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(a) 
.
(b)
.
.(b)
.
.
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(Q.56) Methyl alcohol
is manufactured from carbon monoxide and hydrogen at 300 atmosphere pressure
and 3000C temperature. The catalyst for this reaction is a mixture
of
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(Q.57) During
photosynthesis, plants manufacture their food in green leaves by using
chlorophyll and sunlight to form glucose and oxygen. The reactants required
forthis vital processare
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(a) water and carbon monoxide.
(b) carbon dioxide and carbon monoxide.
(c) water and carbon dioxide.
(d) water and air.
(b) carbon dioxide and carbon monoxide.
(c) water and carbon dioxide.
(d) water and air.
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(Q.58) Lime that is
used in large scale manufacture of cement is
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(Q.59) When lead
nitrate is heated strongly, it breaks down to form simpler substances. The
brown fumes in the products of this reaction are due to the formation of
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(Q.60) Green coloured
crystals are formed by
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(Q.61) Any reaction in
which an insoluble solid is formed that separates out from the solution as
solid is precipitation reaction. One example of precipitation reaction is
|
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(a) 
.
.
(b)
.
(c)
.
(d)
|
(Q.62) When a burning
candle was brought close to a test tube containing an unknown gas, a pop
sound was produced. The unknown gas must be
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(a) hydrogen.
(b) nitrogen.
(c) oxygen.
(d) carbon monoxide.
(b) nitrogen.
(c) oxygen.
(d) carbon monoxide.
