IISER Chemistry - Chemistry of Lighter Metals
Exam Duration: 45 Mins Total Questions : 30
Bleaching powder is obtained by the interaction of chlorine and
- (a)
dil.solution of Cu(OH)2
- (b)
con.solution of Cu(OH)2
- (c)
dry CaO
- (d)
moist slaked lime
Which one of the following is correct? In thwe third row from Na to Cl
- (a)
electronegativity increases
- (b)
electronegativity decreases
- (c)
ionisation energy decreaces
- (d)
atomic volume increases
which of the following function lime stone plays in the manufacture of iron from haematite?
- (a)
as a slag
- (b)
as a flux
- (c)
as a reducing agent
- (d)
as a gangue
Which one of the following pairs shows diagonal relationship?
- (a)
Na and Mg
- (b)
C and N
- (c)
Li and Ca
- (d)
Be and Al
Air can oxidise sodium sulphite in aqueous solution but cannot do so in the case of sodium arsenite.If ,however,air is passed through a solution containing both sodium sulphite and sodium arsenite, then both are oxidised.This is an example of
- (a)
positive catalyst
- (b)
negativecatalyst
- (c)
induced catalyst
- (d)
autocatalyst
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
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
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
Which one of the following refers to Na2SO4.10H2O?
- (a)
salt cake
- (b)
Lebalance salt
- (c)
Glauber's salt
- (d)
sulpher stone
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
Sodium thiosulphate is used in photography to
- (a)
develop the film
- (b)
dissolve silver
- (c)
dissolve silver halide
- (d)
harden the film
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 formula of carnalite is
- (a)
KCl.MgCl2.6H2O
- (b)
K2SO4.MgCl2.6H2O
- (c)
K2SO4.MgSO4.6H2???????O
- (d)
K2SO4.MgSO4CaSO4.6H2O
Identify the correct statement:
- (a)
Gypsum is obtained by heating Plaster of Paris
- (b)
Plaster of Paris can be obtained by hydration of gypsum
- (c)
Plaster of Paris contains higher pecentage of calcium than does gypsum
- (d)
Plaster of Paris is obtained from gypsum by oxidation
portland cement does not contain
- (a)
CaSiO4
- (b)
CaSiO3
- (c)
Ca3Al2O6
- (d)
Ca3PO4
Which one of the following is used as a Purgative?
- (a)
NaCl
- (b)
MgCl2.6H2O
- (c)
CaSO4
- (d)
MgSO4.7HO
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
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
Aluminium oxide is
- (a)
acidic
- (b)
basic
- (c)
amphoteric
- (d)
NONE OF THESE
Which one of the following statement is wrong about aluminium
- (a)
It is the most abundant metal in the earth crust
- (b)
It dissolves readily in concentrated nitric acid
- (c)
It is affected by caustic soda solution
- (d)
It is a good reducing agent
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
The blue colored mineral, Lapis Lazuli which is used as a semi-precious stone is a mineral of the following class:
- (a)
Sodium aluminosilicate
- (b)
Basic copper carbonate
- (c)
Zinc carbonate
- (d)
prussian blue
Duralissian is an alloy which contains
- (a)
Mg+Al
- (b)
Mg+Cu+Al+Mn
- (c)
Mg+Cu
- (d)
Cu+Al
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
The nature of Al(OH)4 is
- (a)
acidic
- (b)
basic
- (c)
amphoteric
- (d)
NONE OF THESE
In red blood cells of human beings,the ratio of potassium to sodium is
- (a)
6:2
- (b)
7:1
- (c)
8:1
- (d)
10:1