p-Block Elements

Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?

Find A, B and C in the following reactions :\(N{H_3} + A + C{O_2} \to {(N{H_4})_2}C{O_3}\)\({(N{H_4})_2}C{O_3} + {H_2}O + B \to N{H_4}HC{O_3}\)\(N{H_4}HC{O_3} + NaCl \to N{H_4}Cl + C\)

On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound Y. X and Y respectively are :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.Reason R : Tl metal has fourteen f electrons in its...

The incorrect statement is :

Chalcogen group elements are :

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is :

Which one of the following compounds of Group-14 elements is not known?

The correct statement about B2H6 is :

Given below are two statements :Statement I : \(\alpha\) and \(\beta\) forms of sulphur can change reversibly between themselves with slow heating or slow cooling.Statement II : At room temperature the stable crystalline form of sulphur is ...

Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z.
X, Y and Z respectively are :

The reaction of sulphur in alkaline medium is given below:

The values of 'a' is _______.
(Integer answer)

Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is _________.(A) \(\alpha\)-sulphur(B) \(\beta\)-sulphur(C) S2-form

Which one of the following group-15 hydride is the strongest reducing agent?

Given below are the statements about diborane(a) Diborane is prepared by the oxidation of NaBH4 with I2(b) Each boron atom is in sp2 hybridized state(c) Diborane has one bridged 3 centre-2-electron bond(d) Diborane is a planar moleculeThe o...

Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10 (in 4 : 1 ratio) is :

The species given below that does NOT show disproportionation reaction is :

The oxide without nitrogen-nitrogen bond is :

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is :

Match List - I with List - II



List - I(process)

List - II(catalyst)




(a)
Deacron's process
(i)
ZSM-5


(b)
Contact process
(ii)
\(CuC{l_2}\)


(c)
Cracking of hydr...

A xenon compound 'A' upon partial hydrolysis gives XeO2F2. The number of lone pair of electrons present in compound A is _________. (Round off to the Nearest Integer)

The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product 'A'. The reaction of 1 mol of 'A' with excess of AgNO3 in aqueous medium gives ___________ mol(s) of Ag. (Round off to the Near...

The set that represents the pair of neutral oxides of nitrogen is :

Match List - I with List - II :



List - I Name of oxo acid

List - II Oxidation state of 'P'




(a)
Hypophosphorous acid
(i)
+5


(b)
Orthophosphoric acid
(ii)
+4


(c)
...

Match List - I with List - II :



List - IIndustrial process

List - IIApplication




(a)
Haber's process
(i)
\(HN{O_3}\) synthesis


(b)
Ostwald's process
(ii)
Aluminium extractio...

A group of 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :

The INCORRECT statement regarding the structure of C60 is :

'X' melts at low temperature and is a bad
conductor of electricity in both liquid and solid
state. X is :

The reaction of H3N3B3Cl3 (A) with LiBH4 in
tetrahydrofuran gives inorganic benzene (B).
Further, the reaction of (A) with (C) leads to
H3N3B3(Me)3. Compounds (B) and (C)
respectively, are :

The number of bonds between sulphur and oxygen atoms in
S2O82- and the number of bonds between sulphur
and sulphur atoms in rhombic sulphur, respectively, are :

White Phosphorus on reaction with concentrated
NaOH solution in an inert atmosphere of CO2
gives phosphine and compound (X). (X) on
acidification with HCl gives compound (Y). The
basicity of compound (Y) is :

A metal (A) on heating in nitrogen gas gives
compound B. B on treatment with H2O gives
a colourless gas which when passed through
CuSO4 solution gives a dark blue-violet
coloured solution. A and B respectively, are :

In the following reaction, products (A) and (B) respectively, are :
NaOH + Cl2 \(\to\) (A) + side products
(hot and conc.)
Ca(OH)2 + Cl2 \(\to\) (B) + side products
(dry)

The correct statement with respect to
dinitrogen is :

Reaction of an inorganic sulphite X with dilute
H2SO4 generates compound Y. Reaction of Y
with NaOH gives X. Further, the reaction of X
with Y and water affords compound Z. Y and Z,
respectively, are :

The reaction of NO with N2O4 at 250 K gives :

Boron and silicon of very high purity can be obtained through :

Reaction of ammonia with excess Cl2
gives :

On heating, lead (II) nitrate gives a brown gas
(A). The gas (A) on cooling changes to a
colourless solid/liquid (B). (B) on heating with
NO changes to a blue solid (C). The oxidation
number of nitrogen in solid (C) is :

In a molecule of pyrophosphoric acid, the number of P - OH, P = O and P - O - P bonds/moiety(ies)
respectively are :

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :

On heating compound (A) gives a gas (B) which
is a constituent of air. This gas when treated
with H2 in the presence of a catalyst gives
another gas (C) which is basic in nature. (A)
should not be :

Correct statements among a to d regarding silicones are :
(a)   They are polymers with hydrophobic character.
(b)   They are biocompatible.
(c)   In general, they have high thermal stability and low dielectric strength.
(d)   Usually, t...

The one that is extensively used as a piezoelectric material is :

Good reducing nature of H3PO2 is attributed to the presence of :

C60 an allotrope of carbon contains :

The amorphous form of silica is :

The correct statements among I to III regarding
group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are
amphoteric.
(III) Oxides of indium and thalliumare basic.

Diborane (B2H6) reacts with O2 and H2O independently, then products formed are :

Iodine reacts with concentrated HNO3 to yield Y along with other products. The oxidation state of iodine in Y, is :