IISER Chemistry - Chemistry of Heavier Metals
Exam Duration: 45 Mins Total Questions : 30
When a copper (II) sulphate is treated with excess ammonia, it forms
- (a)
a black precipitate
- (b)
a deep blue solution
- (c)
a red precipitate
- (d)
a white precipitate turning black
This is because of the formation of the tetra-amino cupric ion.
Cu2+ + 4NH3 \(\longrightarrow\) [Cu(NH3)4]2+
when CuSO4 reacts with aq KI, the products are
- (a)
CuI2 + K2SO4
- (b)
Cu2I2 + K2SO4
- (c)
Cu2I2 + K2SO4 + I2
- (d)
Cu + k2SO4 + I2
2[CuSO4 + 2KI \(\longrightarrow\) CuI2 + K2SO4]
\(\frac { 2Cu{ I }_{ 2 }\rightarrow { Cu }_{ 2 }{ I }_{ 2 }+{ I }_{ 2 } }{ 2Cu{ SO }_{ 4 }+4KI\rightarrow { Cu }_{ 2 }{ I }_{ 2 }+2{ K }_{ 2 }{ SO }_{ 4 }+{ I }_{ 2 } } \)
German silver is an alloy of
- (a)
Cu and Zn
- (b)
Au,Cu, and Zn
- (c)
Ag and Ni
- (d)
Cu,Zn and Ni
German silver does not contain silver at all.
Cu = 25 to 50%, Zn = 25 to 35%, Ni = 15 to 35%
Cu2+ will have the electronic configuration
- (a)
1s2;2s2;2p6;3s2;3p8;3d10
- (b)
1s2;2s2;2p6;3s2;3p6;3d9;4s1
- (c)
1s2;2s2;2p6;3s2;3p6;3d9
- (d)
1s2;2s2;2p6;3s2;3p6;3d10
1s2; 2s22p6; 3s23p63d9
Identify the statement which is not correct:
- (a)
CuSo4 reacts with KI in aqueous solution to give Cu2I2
- (b)
CuSO4 reacts with KCI in aqueous solution to give Cu2CI2
- (c)
CuSO4 reacts with NAOH and glucose in aqueous medium to give Cu2O
- (d)
CUSO4 on strong heating gives CuO
In solution, the ions will remain free Cu2+ , SO42- , K+ , Cl- .
When pyrolusite is fused with KOH in presence of Cu,the mass becomes
- (a)
green
- (b)
black
- (c)
red
- (d)
pink
MnO2 + 2KOH + [O] \(\longrightarrow\) K2MnO4 + H2O
K2MnO4 produced is green in colour.
Which one of the following is wrongly paired ?
- (a)
Cr2(SO4)3 - purple
- (b)
K2Cr2O7 - orange
- (c)
MnSO4 - yellow
- (d)
CuSO45H2o - blue
MnSO4 is light pink.
Which one of the following metal ions is paramagnetic ?
- (a)
Cu+
- (b)
Zn2+
- (c)
Ti3+
- (d)
Sc3+
d1 configuration, it is paramagnetic; the configurations in others are (a) d10 (b) d10 (d) d0.
which one of the following salts does not give a coloured solution in water ?
- (a)
FeSO4
- (b)
CuSO4
- (c)
Ag2SO4
- (d)
NiSO4
Ag+ has 4d10 configuration; the d-orbitals are completely filled in this case and the ion is colourless.
Which one of the following metals is purified by fractional distillation ?
- (a)
iron
- (b)
copper
- (c)
silver
- (d)
zinc
Crude zinc is subjected to fractional distillation. Iron (b.p. 2800oC), lead (b.p. 1620oC) are left in the distillation flask. The condensed zinc is carefully redistilled to get rid of cadmium (b.p. 767oC) which boils off before zinc.
Which one of the following oxides is used as a white pigment ?
- (a)
ZnO
- (b)
CuO
- (c)
FeO
- (d)
NiO
ZnO is known as Philosopher's wool. It is used in white paints in place of white lead; it does not blacken with hydrogen sulphide present in air as the white lead paint does.
CuSO4 is commerically made from Cu scarp by
- (a)
dissolving it in hot conc.H2SO4
- (b)
spraying warm dil. H2SO4
- (c)
heating with sodium sulphate
- (d)
heating with sulphar
By spraying warm H2SO4 on copper.
The type of iron obtained from blast furance is
- (a)
wrought iron
- (b)
cast iron
- (c)
pig iron
- (d)
mild steel
It is called pig iron. It contains 3 to 5% C. It does not rust and hence used for water pipes and drain pipes.
Which one of the following changes involves a bond forming process ?
- (a)
stretching of rubber
- (b)
rusting of iron
- (c)
dissolving of sugar in water
- (d)
emission of rays by radioactive process
Rusting of iron.
Which one of the following is the purest form of iron ?
- (a)
pig iron
- (b)
wrought iron
- (c)
steel
- (d)
cast iron
(b) Wrought iron contains 0.2 to 0.5% C.
(a) and (d) are the same—contains 3 to 5% C.
(c) steel contains 0.1 to 1.5% carbon.
White lead is
- (a)
Pb(OH)2.PbCO3
- (b)
Pb(OH)2.Pb(CH3oo)2
- (c)
Pb(OH)2
- (d)
PbCO3
White lead is also called basic lead carbonate; it is used as white paint.
When tin is heated with concentrated nitric acid, the compound formed is
- (a)
stannic nitrate
- (b)
metastannic acid
- (c)
stannous nitrate
- (d)
stannic oxide
Sn + 4HNO3(conc.) \(\longrightarrow\) H2SnO3 + 4NO2 + H2O
Metastannic
Acid
In the production of iron from Fe2O3 the reducing agent used is
- (a)
CO
- (b)
C
- (c)
AI
- (d)
Cr
Bronze is an alloy of
- (a)
Sn and Pb
- (b)
Sn and Cu
- (c)
Sn,Cu,Ag
- (d)
Sn,Zn ,Ni
Metallic silver may be obtainedform AgCl by
- (a)
heating it in current of H2
- (b)
fusing it with sand
- (c)
treatment with Cd and H2SO4
- (d)
fusing it with NA2CO3
The substance that sublimes on heating:
- (a)
MgCL2
- (b)
AgCL
- (c)
HgCL2
- (d)
NaCL
KI and K2SO4 solution when mixed give
- (a)
CuI2 + K2SO4
- (b)
Cu2I2+ K2SO4
- (c)
K2SO4 + Cu2I2 +I2
- (d)
K2SO4 + Cu2I +I2
2KI + CuSO4 \(\longrightarrow\) K2SO4 + CuI2
2CuI2 \(\longrightarrow\) Cu2I2 + I2
Copper displaces the metal in the salt solution of
- (a)
AgNO3
- (b)
ZnSO4
- (c)
FeSO4
- (d)
CaCl
Silver is below Cu in electro-chemical series.
Tin amalgam is used for making
- (a)
rollers
- (b)
mirrors
- (c)
cigarette wrapers
- (d)
cans
The element which forms ions in dimeric state is:
- (a)
Hg
- (b)
Fe
- (c)
Ni
- (d)
Be
The metal extracted by leaching of a cyancide is
- (a)
Mg
- (b)
Ag
- (c)
Cu
- (d)
Na
Which one of the following is the outer electronic configuration of an element belonging to the d-block of the periodic table ?
- (a)
ns2np1
- (b)
(n-1)d2ns2
- (c)
ns2np6
- (d)
ns2np2
Incomplete d-orbitals.
Which one of the following cations has the maximum magnetic moment in a weak ligand field ?
- (a)
Cu2+
- (b)
Fe2+
- (c)
Ni2+
- (d)
Co2+
which one of the following is not a use of mercury ?
- (a)
the preparation of colomel
- (b)
mercury lamps
- (c)
extraction of silver
- (d)
making amalgans
Which is the metal 'M' in the following equation ?
\(2[Ag(C\overline { N } { ) }_{ 2 }]+M\rightarrow 2Ag+[M(CN{ ) }_{ 4 }{ ] }^{ 2 }\)
- (a)
Au
- (b)
Cu
- (c)
Fe
- (d)
Zn