Which of the following is more stable

Least stable hydride is:

Carbogen is

Graphite is good conductor of current but
diamond is non-conductor because

Which in not correct

Carbon monoxide acts as a Lewis base
because it has :

Percentage of lead in lead pencil is :

Which gas is responsible for green house
effect :

Bucky ball or buck minister fullerene is

When CO is heated with NaOH under
pressure, we get :

Artificial gem used for cutting glass is :

Cerium oxide containing special variety of
glass, which cuts off ultraviolet rays is known,
as :

Amongst the elements of group 14, the
reducing power of the divalent species
decreases in the order

The non existence of PbI4

is due to :

The reducing character of hydrides of group
14 elements is :

The tetrahalides of group 14 elements (except
that of carbon) act as :

Which of the following statement is not true:

Plumbosolvency is represented by the
reaction:

Which of the following gases, if present, in
the atmosphere darkens the surface painted
by white lead

Water transported through lead pipes
becomes poisonous due to the formation of:

Carborundum is obtained when silica is
heated at high temperature with

Which is /are true statements :

Semi water gas is:

Graphite is a soft solid lubricant extremely
difficult to melt. The reason for this anomalous
behaviour is that graphite :

For making good quality mirrors, plates of
float glass are used. These are obtained by
floating molten glass over liquidmetal which
does not solidify before glass. The metal used
can be:

The Soldiers of Napolean army while at Alps
during freezing winter suffered a serious
problem as regards to the tin buttons of their
uniforms. White Metallic tin buttons get
converted to grey powder. This transformation
is related to:

In silicon dioxide

Which of the following oxide is amphoteric:

The stability of dihalides of Si, Ge, Sn and
Pb increases steadily in the sequenhce:

Lead pencil contains

Which of the following halides is least stable
and has doubtful existence ?

The number and type of bonds between two
carbon atoms in CaC2
are

The correct order of increasing C – O bond
length of CO, CO3

–2 and CO2
is

(Me)2SiCl2

on hydrolysis will produce

When PbO2

reacts with conc. HNO3
, the gas

evolved is:

The species present in solution when CO2
is

dissolved in water are