Q.1
Silicon is important constituent of .. [ CPMT 1988]
  • a) Chlorophyll
  • b) Hemoglobin
  • c) Rocks
  • d) Amalgams
Q.2
When a mixture of air and steam is passed over red hot coke, the outgoing gas is .. [ CPMT 1990]
  • a) Producer gas
  • b) Water gas
  • c) Coal gas
  • 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]
  • a) 13
  • b) 14
  • c) 15
  • d) 16
Q.4
Which of the following is most dense? [ CPMT 1996]
  • a) Fe
  • b) Cu
  • c) B
  • d) Pb
Q.5
Carborundum is obtained when silica is heated at high temperature with .. [ IIT 1982]
  • a) Carbon
  • b) Carbon monoxide
  • c) Carbon dioxide
  • d) Calcium carbonate
Q.6
The ion that can be precipitated by HCl as well as H2S is .. [ CBSE PMT 1996]
  • a) Pb2+
  • b) Fe3+
  • c) Zn2+
  • d) Cu2+
Q.7
White lead is .. [ MP PMT 1995]
  • a) PbCO3
  • b) PbCO3PBO
  • c) Pb(OH)2 . 2PbCO3
  • d) PbSO4 PbO
Q.8
Na+, Mg+, Al3+ and Si4+ are isoelectronic, their ionic size will follow the order ... [ CBSE PMT 1993]
  • a) Na+ > Mg2+ < Al3+ < Si4+
  • b) Na+ < Mg2+ < Al3+ < Si4+
  • c) Na+ > Mg2+ > Al3+ > Si4+
  • d) Na+ < Mg2+ > Al3+ < Si4+
Q.9
Which does not exist.. [ CPMT 1988]
  • a) [SiCl6]2-
  • b) [GeF6]2-
  • c) [CCl6]2-
  • d) [SnCl6]2-
Q.10
Silica is soluble in ... [ EAMCET 1998]
  • a) HCl
  • b) HNO3
  • c) H2SO4
  • d) HF
Q.11
The shape of gaseous SnCl2 is .. [ Kerala MEE 2000]
  • a) Tetrahedral
  • b) Linear
  • c) Angular
  • d) T-shaped
Q.12
Butter of tin is ... [ BVP pune 2002]
  • a) SnCl2. 5H2O
  • b) SnCl2 .2H2O
  • c) SnCl4 . 4H2O
  • d) SnCl4.5H2O
Q.13
Which of the following is a true acid anhydride
  • a) Al2O3
  • b) CO2
  • c) CO
  • d) Na2O
Q.14
In the compound have the same crystal structure and analogous formulate they are called
  • a) isotopes
  • b) isobars
  • c) allotropes
  • d) isomers
Q.15
Carbon monoxide is form by the action of Sulphuric acid on...
  • a) Formic acid
  • b) Oxalic acid
  • c) Potassium ferro cyanide
  • 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]
  • a) 167 , 180, 348
  • b) 180, 167, 348
  • c) 348, 167, 180
  • d) 348, 180, 167
Q.17
C and Si have ... [ CPMT 1998]
  • a) same physical properties
  • b) Different physical properties
  • c) Same physical properties but different chemical properties
  • d) Different physical and chemical properties
Q.18
CO2 is gas at room temperature while SiO2 is solid why?
  • a) Molecular mass of SiO2 is high
  • b) three dimensional network of SiO2
  • c) Higher electro negativity of C
  • d) Acidic character of SiO2
Q.19
Pyrosilicate ion is ... {kerala EE 2002]
  • a) SiO22-
  • b) SiO42-
  • c) Si2O67-
  • d) Si2O76-
Q.20
The most stable +2 oxidation state is exhibited by ... [ Kerala MEE 2000]
  • a) Fe
  • b) Sn
  • c) Pb
  • d) Si
Q.21
Which of the following is most electronegative? [ CPMT 1999]
  • a) Pb
  • b) Si
  • c) C
  • d) Sn
Q.22
The electronic configuration of four different elements is given below. Identify the group 14 element among these
  • a) [He]2s1
  • b) [Ne]3s2
  • c) [Ne]3s23p2
  • d) [Ne] 3s2 3p5
Q.23
Which is not true for silicones
  • a) Low thermal conductivity
  • b) Low chemical reactivity
  • c) Does not support microbiological growth
  • d) All silicone are solid plastic at room temperature
Q.24
Black lead is
  • a) Diamonds
  • b) Graphite
  • c) Charcoal
  • 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]
  • a) Pb is more electro positive than Ge
  • b) Ionizing potential of lead is less than that of Ge
  • c) Ionic radii of Pb4+ and Pb2+ are larger than those of Ge4+ and Ge2+
  • d) More pronounced inert pair effect in lead than Ge
Q.26
Mark the oxide which are amphoteric in character [ MP PMT 2000]
  • a) CO2
  • b) SiO2
  • c) SnO2
  • d) CaO
Q.27
Quartz is a /an .. [ DPMT 2002]
  • a) Orthosilicate
  • b) Pyrosilicate
  • c) Sheet silicate
  • d) Three dimensional silicate
Q.28
Select incorrect statement
  • a) In three dimensional net work each silicon share three oxygen atoms
  • b) In Si2O76- there is one shared electron
  • c) In SiO44- there no oxygen shared
  • d) There are three shared electron for three dimensional network silica
Q.29
Percentage of lead in lead pencil is .... [ DPMT 1999]
  • a) Zero
  • b) 20
  • c) 80
  • d) 70
Q.30
Inert pair effect is exhibited by .. [ Hariyana CEET 2003]
  • a) Pb
  • b) B
  • c) Si
  • d) Al
0 h : 0 m : 1 s