Chemistry - Chemistry of Lighter Metals
Exam Duration: 45 Mins Total Questions : 30
Due to the presence of which of the following molten sodium chloride conducts electricity?
- (a)
free electrons
- (b)
ions
- (c)
atoms of Na
- (d)
atoms of cl
which one of the following anhydrous halides can be prepared by heating its hydrated form?
- (a)
Zncl2
- (b)
Mgcl2
- (c)
Bacl2
- (d)
Alcl3
Which one of the following mixtures is known as morter?
- (a)
slaked lime and water
- (b)
CaCO3 and water
- (c)
CaCO3 ,sand and water
- (d)
slaked lime ,sand and water
An aqueous solution of potash alum is
- (a)
alkaline
- (b)
acidic
- (c)
neutral
- (d)
soapy to touch
Carbondioxid egas is obtained by heating a sodium compound X. By passing CO2 gas in the solution of resulting sodium compound Y , X is again obtained.The compounds X and Y respectively are
- (a)
Na2CO3 and NaCl
- (b)
NaHCO3 and NaCl
- (c)
NaHCO3 and Na2CO3
- (d)
Na2CO3 and NaOH
In the alkali metal series caesium is the most reactive metal because
- (a)
its complte shell is nearest to tbe nucleus
- (b)
it exerts considerable attractive force on valance electrons
- (c)
it is a heavier metal
- (d)
its valance electrons has the highest principal quantum number than the valence electron of any of the others
Which one the following statement about KClO3 is wrong?
- (a)
It is a reducing agent
- (b)
It liberates Cl2 when treated with I2 solution
- (c)
It is prepared by passing Cl2 gas into KOH solution
- (d)
It give soxygen gas when heated alone
When sulpher is heated with aqueous NaOH the compound(s) formed is/are
- (a)
Na2S.H2O
- (b)
Na2SO3.H2O
- (c)
Na2S.Na2S2O3.H2O
- (d)
Na2S2O3.H2O
In the manufacture of sodium hydroxide,which one is obtained as a by-product?
- (a)
oxygen
- (b)
chlorine
- (c)
sodium carbonate
- (d)
sodium chloride
Sodium thiosulphate is used in photography to
- (a)
develop the film
- (b)
dissolve silver
- (c)
dissolve silver halide
- (d)
harden the film
Sodium hydroxide is prepared by the electrolysis of an aqueous solution of
- (a)
sodium chloride with platinum electrodes
- (b)
sodium chloride with graphite anode and iron cathode
- (c)
sodium carbonate with nickel electrodes
- (d)
ALL OF THE ABOVE
Sodium has compared to pottasium
- (a)
less electronegativity
- (b)
more ionisation potential
- (c)
large atomic mass
- (d)
lower m.p.
A sloid of compound of group IA (Group according to IUPAC ) element and it gives violet colour in flame test; the solid A is
- (a)
NaCl
- (b)
KCl
- (c)
CsCl
- (d)
LiCl
chile saltpetre is
- (a)
NaNO3
- (b)
KNO3
- (c)
Na2SO4
- (d)
K2CO3
Which is an ore of potassium?
- (a)
Carnallite
- (b)
Bauxite
- (c)
Cryolite
- (d)
Dolomite
The reaction of sodium thiosulphate with I2 gives
- (a)
sodium sulphate
- (b)
sodium thiosulphide
- (c)
sodium sulphite
- (d)
sodium tetrathionate
Sodium is highly reactive and therefore kept under
- (a)
liquid nitrogen
- (b)
kerosene
- (c)
olive oil
- (d)
chloroform
portland cement does not contain
- (a)
CaSiO4
- (b)
CaSiO3
- (c)
Ca3Al2O6
- (d)
Ca3PO4
Setting of cement is
- (a)
exothermic reaction
- (b)
endothermic reaction
- (c)
neither exothermic nor endothermic reaction
- (d)
NONE OF THESE
Which one of the following is used as a Purgative?
- (a)
NaCl
- (b)
MgCl2.6H2O
- (c)
CaSO4
- (d)
MgSO4.7HO
The metal which can be obtained from all the three ores,dolomite,magnesite and carnellite, is
- (a)
sodium
- (b)
potassium
- (c)
magnesium
- (d)
calcium
Themite for welding is made by mixing
- (a)
Al and Fe2O3
- (b)
Al2O3 and Fe2O3
- (c)
MgO and Al2O3
- (d)
Al and MgO
Pure aluminium metal is not reacted upon by
- (a)
sulphuric acid
- (b)
hydrochloric acid
- (c)
concentrated nitric acid
- (d)
caustic soda
Action of caustic soda on aluminium gives a compound having formula
- (a)
Al2(OH)4
- (b)
NaAlO2
- (c)
Na2Al(OH)4
- (d)
Na3AlO3
Duralissian is an alloy which contains
- (a)
Mg+Al
- (b)
Mg+Cu+Al+Mn
- (c)
Mg+Cu
- (d)
Cu+Al
Which one of the following is evxist as dinner?
- (a)
aluminium chloride
- (b)
aluminium bromide
- (c)
aluminium iodide
- (d)
Magnesium chloride
Aluminium is obtained by
- (a)
heating aluminium with carbon
- (b)
electrolising a mixture of alumina and cryolite
- (c)
heating red bauxite
- (d)
heating alumina in H2 atmosphere
An hydrous Al2Cl6 can be prepared by
- (a)
passing Cl2 over heated alumina and carbon
- (b)
trearting Al2O3 with MnO2
- (c)
passing HCl through Al(OH)3
- (d)
treatment of alunite with H2SO4
Aluminium is more reactive than iron but Aluminium is lesseasily corroded than iron because
- (a)
aluminium is noble metal
- (b)
oxygen forms a protective oxide layer
- (c)
iorn under goes reaction easily with water
- (d)
iron forms both mono and divalent ions
During Hoope's process for electrolytic refining of Al, the middle layer is of
- (a)
pure aluminium
- (b)
impure aluminium
- (c)
cryolite and CaF2
- (d)
Alloys Al,Ca and Si