EASY
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Which one is formed when CaC2 is allowed to react with dilute HCl?

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Important Questions on p-Block elements

MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements

Identify the correct statements from the following:

a) Silicones are hydrophobic in nature. 

b) The repeating unit in silicones is

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c) In a C60 molecule, twenty C6 rings and twelve C5 rings are present. 

d) Dehydration of formic acid by concentrated H2SO4 at 100oC gives CO2. 

e) The distance between two layers in graphite is 34 pm. 

EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
The correct statement about silicone is
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
What product is formed when HF reacts with glass?
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Formic acid reacts with concentrated H2SO4 at 100°C to liberate A. When A is passed over heated ferric oxide, B and C are formed. What are A, B and C, respectively?
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Example of a three-dimensional silicate is :
 
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Identify the incorrect statements from the following
I. Tin in +2 state acts as reducing agent while lead in +4 state acts as strong oxidising agent.
II. Silicon exists as both SiF62- and SiCl62- forms.
III. The hybridisation of carbon in fullerene is sp3.
IV. Among Ge, Sn and Pb lowest melting point is for Sn.
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Among the following substituted silanes, the one which will give rise to cross linked silicone polymer on hydrolysis is?
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Which of the following organo-silicon compound on hydrolysis will given a three dimensional silicon ?
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Match the items in Column I with its main use listed in Column II:
 
  Column I   Column II
A Silica gel i. Transistor
B Silicon ii. Ion-exchanger
C Silicone iii. Drying agent
D Silicate iv. Sealant
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
The basic structural unit of feldspar, zeolites mica, and asbestos is:
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
The main reason that SiCl4 is easily hydrolysed as compared to CCl4 is that
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
The major products obtained in the reaction of oxalic acid with conc. H2SO4 upon heating are
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
SiO2 is attacked by which one/ones of the following?
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Si reacts with CH3Cl at 573 K in the presence of Cu powder to form methyl substituted chlorosilanes. Among the given methyl substituted chlorosilanes, whose yield is minimum?
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
The role of haemoglobin is to
 
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Dry ice is
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
CH33SiCl is used during polymerization of organosilicons because
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
Identify the correct statements from the following:
(a) CO2g is used as a refrigerant for ice cream and frozen food.
(b) The structure of C60 contains twelve six-membered carbon rings and twenty-five membered carbon rings.
(c) ZSM−5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is a colourless and odourless gas.
MEDIUM
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on hydrolysis gives a white gelatinous precipitate. The precipitate is:
EASY
Chemistry>Inorganic Chemistry>p-Block elements>Important Compounds of Group 14 Elements
What is the chief constituent of pyrex glass?