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
The alkaline earth metals are
- (a)
Na and K
- (b)
Mg and Ca
- (c)
Cu and Mg
- (d)
Al and Fe
W hich one of the following gases is used for the treatment of cancer ?
- (a)
He
- (b)
Ne
- (c)
Ar
- (d)
Rn
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
which one is the strongst base among the following?
- (a)
Mg(OH)2
- (b)
Ca(OH)2
- (c)
Al(OH)3
- (d)
Si(OH)4
Of metals Be,Mg,Ca and Sr of group IIA (group 2 accoring to IUPAC ) of the periodic table, the least ionic chloride is
- (a)
Sr
- (b)
Ca
- (c)
Mg
- (d)
Be
W hich one of the folowing is the main compound formed on reaction of sodium with limited supply of oxygen?
- (a)
Na2O
- (b)
NaO2
- (c)
Na2O2
- (d)
Na2O4
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
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.
chile saltpetre is
- (a)
NaNO3
- (b)
KNO3
- (c)
Na2SO4
- (d)
K2CO3
Sodium is highly reactive and therefore kept under
- (a)
liquid nitrogen
- (b)
kerosene
- (c)
olive oil
- (d)
chloroform
The formula of carnalite is
- (a)
KCl.MgCl2.6H2O
- (b)
K2SO4.MgCl2.6H2O
- (c)
K2SO4.MgSO4.6H2???????O
- (d)
K2SO4.MgSO4CaSO4.6H2O
KMnO4 is a powerful
- (a)
reducing agent
- (b)
oxidising agent
- (c)
hydrating agent
- (d)
dehydrating agent
Setting of Plaster of Paris is
- (a)
oxidation with atmospheric oxygen
- (b)
combination with atmospheric CO2
- (c)
dehydration
- (d)
Hydration to yield another hydrate
Mixture of MgCl2 and MgO is called
- (a)
Portland cement
- (b)
Sorrel's cement
- (c)
Double salt
- (d)
NONE OF THE ABOVE
Setting of cement is
- (a)
exothermic reaction
- (b)
endothermic reaction
- (c)
neither exothermic nor endothermic reaction
- (d)
NONE OF THESE
Milk of magnesia is
- (a)
a mixture of magnesium oxide and magnesium carbonate in water
- (b)
magnesium carbonate suspended in water
- (c)
magnesium metal suspended in water
- (d)
magnesium hydroxide suspended in water
The metal which can be obtained from all the three ores,dolomite,magnesite and carnellite, is
- (a)
sodium
- (b)
potassium
- (c)
magnesium
- (d)
calcium
Action of caustic soda on aluminium gives a compound having formula
- (a)
Al2(OH)4
- (b)
NaAlO2
- (c)
Na2Al(OH)4
- (d)
Na3AlO3
Which one of the following is alum?
- (a)
CaSO4.2H2O
- (b)
NH4Al(SO4)2.12H2O
- (c)
KAlS3O8
- (d)
AlCl3.6H2O
Cryolite is used in electrolytic extraction of aluminium
- (a)
to obtaim more aluminium
- (b)
to dissolve bauxite
- (c)
to protect anode
- (d)
as a reducing agent
Which one of following mixed sulpahte is alum?
- (a)
K2SO4.Al(SO4)3.24H2O
- (b)
K2SO4.Cr(SO4)3.24H2O
- (c)
Na2SO4.Al(SO4)3.24H2O
- (d)
CuSO4.Al(SO4)3.24H2O
Which one of the following is evxist as dinner?
- (a)
aluminium chloride
- (b)
aluminium bromide
- (c)
aluminium iodide
- (d)
Magnesium chloride
All of the following substances react with watyer. Tha pair that yields the same gaseous product is
- (a)
NaNa2O2
- (b)
K and KO2
- (c)
Ba and BaO2
- (d)
Ca and CaH2
Which one of the following metal ions plays an important role in muscle contraction?
- (a)
Ca2+
- (b)
Mg2+
- (c)
Na+
- (d)
K+
Aluminium vessel should not be washed with material containing washing soda because washing soda
- (a)
is expesive
- (b)
is easily decomposed
- (c)
reacts with aluminium to form soluble aluminate
- (d)
reacts with aluminium to form insoluble aluminium oxide
The nature of Al(OH)4 is
- (a)
acidic
- (b)
basic
- (c)
amphoteric
- (d)
NONE OF THESE
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
Which of the following is not use of epsom salt (MgSO4.7H2O)?
- (a)
as a purgative
- (b)
as amodant in drying
- (c)
as asimultant to increase the secretion of bile
- (d)
for removal of sulphur from petroleum