The correct order:
Important Questions on The p-Block Elements
(a) is used as a refrigerant for ice cream and frozen food.
(b) The structure of contains twelve six-membered carbon rings and twenty-five membered carbon rings.
(c) , a type of zeolite, is used to convert alcohols into gasoline.
(d) is a colourless and odourless gas.
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning.
In the light of the above statements, choose the correct answer from the options given below:
a) The isotope of carbon containing neutrons has natural abundance of
b) Among the IV A group elements, Sn has the lowest melting point
c) Silicon is the (by mass) most abundant element in the earth's crust
d) Elemental carbon shows the highest electrical resistivity among the group elements
Identify the correct statements from the following.
i) Quartz is a piezoelectric material
ii) All group tetrachlorides except are easily hydrolyzed in water.
iii) The bond distance within the layer of graphite is .
iv) is soluble in aqueous solution.
Correct statements among regarding silicones are:
They are polymers with hydrophobic character.
They are biocompatible.
In general, they have high thermal stability and low dielectric strength.
Usually, they are resistant to oxidation and used as greases.
Among the following, the number of halide(s) which is/ are inert to hydrolysis is
(A)
(B)
(C)
(D)
Germanium exists only in traces.
The order of electronegativity of is
All group elements are available in solid state
