Silicon is important constituent of .. [ CPMT 1988]
18%
a) Chlorophyll
9%
b) Hemoglobin
45%
c) Rocks
27%
d) Amalgams
Q.2.
When a mixture of air and steam is passed over red hot coke, the outgoing gas is .. [ CPMT 1990]
0%
a) Producer gas
67%
b) Water gas
33%
c) Coal gas
0%
d) None of these gases
Q.3.
A solid element ( Symbol Y) conducts electricity and form two chlorides YCln ( a colorless volatile liquid) and YCln-2 ( a colorless solid). To which one of the following groups of the periodic table does Y belong? [ Pb CET 1995]
20%
a) 13
20%
b) 14
40%
c) 15
20%
d) 16
Q.4.
Which of the following is most dense? [ CPMT 1996]
33%
a) Fe
17%
b) Cu
17%
c) B
33%
d) Pb
Q.5.
Carborundum is obtained when silica is heated at high temperature with .. [ IIT 1982]
0%
a) Carbon
14%
b) Carbon monoxide
29%
c) Carbon dioxide
57%
d) Calcium carbonate
Q.6.
The ion that can be precipitated by HCl as well as H2S is .. [ CBSE PMT 1996]
57%
a) Pb2+
29%
b) Fe3+
14%
c) Zn2+
0%
d) Cu2+
Q.7.
White lead is .. [ MP PMT 1995]
33%
a) PbCO3
0%
b) PbCO3PBO
67%
c) Pb(OH)2 . 2PbCO3
0%
d) PbSO4 PbO
Q.8.
Na+, Mg+, Al3+ and Si4+ are isoelectronic, their ionic size will follow the order ... [ CBSE PMT 1993]
33%
a) Na+ > Mg2+ < Al3+ < Si4+
50%
b) Na+ < Mg2+ < Al3+ < Si4+
17%
c) Na+ > Mg2+ > Al3+ > Si4+
0%
d) Na+ < Mg2+ > Al3+ < Si4+
Q.9.
Which does not exist.. [ CPMT 1988]
33%
a) [SiCl6]2-
0%
b) [GeF6]2-
67%
c) [CCl6]2-
0%
d) [SnCl6]2-
Q.10.
Silica is soluble in ... [ EAMCET 1998]
0%
a) HCl
20%
b) HNO3
20%
c) H2SO4
60%
d) HF
Q.11.
The shape of gaseous SnCl2 is .. [ Kerala MEE 2000]
50%
a) Tetrahedral
33%
b) Linear
17%
c) Angular
0%
d) T-shaped
Q.12.
Butter of tin is ... [ BVP pune 2002]
20%
a) SnCl2. 5H2O
20%
b) SnCl2 .2H2O
20%
c) SnCl4 . 4H2O
40%
d) SnCl4.5H2O
Q.13.
Which of the following is a true acid anhydride
20%
a) Al2O3
0%
b) CO2
60%
c) CO
20%
d) Na2O
Q.14.
In the compound have the same crystal structure and analogous formulate they are called
40%
a) isotopes
40%
b) isobars
20%
c) allotropes
0%
d) isomers
Q.15.
Carbon monoxide is form by the action of Sulphuric acid on...
20%
a) Formic acid
0%
b) Oxalic acid
60%
c) Potassium ferro cyanide
20%
d) all these
Q.16.
The catenation tendency of C, Si and Ge is in the order Ge < Si < C. the bond energies ( in kJ mol-) of C - C, Si - Si and Ge - GE bonds respectively are ... [ EAMCET 2001]
0%
a) 167 , 180, 348
20%
b) 180, 167, 348
20%
c) 348, 167, 180
60%
d) 348, 180, 167
Q.17.
C and Si have ... [ CPMT 1998]
0%
a) same physical properties
0%
b) Different physical properties
75%
c) Same physical properties but different chemical properties
25%
d) Different physical and chemical properties
Q.18.
CO2 is gas at room temperature while SiO2 is solid why?
0%
a) Molecular mass of SiO2 is high
40%
b) three dimensional network of SiO2
20%
c) Higher electro negativity of C
40%
d) Acidic character of SiO2
Q.19.
Pyrosilicate ion is ... {kerala EE 2002]
25%
a) SiO22-
25%
b) SiO42-
0%
c) Si2O67-
50%
d) Si2O76-
Q.20.
The most stable +2 oxidation state is exhibited by ... [ Kerala MEE 2000]
33%
a) Fe
0%
b) Sn
50%
c) Pb
17%
d) Si
Q.21.
Which of the following is most electronegative? [ CPMT 1999]
20%
a) Pb
20%
b) Si
20%
c) C
40%
d) Sn
Q.22.
The electronic configuration of four different elements is given below. Identify the group 14 element among these
0%
a) [He]2s1
20%
b) [Ne]3s2
40%
c) [Ne]3s23p2
40%
d) [Ne] 3s2 3p5
Q.23.
Which is not true for silicones
20%
a) Low thermal conductivity
20%
b) Low chemical reactivity
20%
c) Does not support microbiological growth
40%
d) All silicone are solid plastic at room temperature
Q.24.
Black lead is
0%
a) Diamonds
25%
b) Graphite
50%
c) Charcoal
25%
d) Coke
Q.25.
Ge(II) compounds are powerful reducing agents where as Pb(IV) compounds are strong oxidising agents. It can be due to [ Pb.CET 1998]
0%
a) Pb is more electro positive than Ge
20%
b) Ionizing potential of lead is less than that of Ge
40%
c) Ionic radii of Pb4+ and Pb2+ are larger than those of Ge4+ and Ge2+
40%
d) More pronounced inert pair effect in lead than Ge
Q.26.
Mark the oxide which are amphoteric in character [ MP PMT 2000]
0%
a) CO2
50%
b) SiO2
33%
c) SnO2
17%
d) CaO
Q.27.
Quartz is a /an .. [ DPMT 2002]
0%
a) Orthosilicate
0%
b) Pyrosilicate
50%
c) Sheet silicate
50%
d) Three dimensional silicate
Q.28.
Select incorrect statement
25%
a) In three dimensional net work each silicon share three oxygen atoms
25%
b) In Si2O76- there is one shared electron
0%
c) In SiO44- there no oxygen shared
50%
d) There are three shared electron for three dimensional network silica
Q.29.
Percentage of lead in lead pencil is .... [ DPMT 1999]
25%
a) Zero
0%
b) 20
50%
c) 80
25%
d) 70
Q.30.
Inert pair effect is exhibited by .. [ Hariyana CEET 2003]
50%
a) Pb
0%
b) B
0%
c) Si
50%
d) Al
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