An aq soln of a gas X gives the
It decolorizes an acidified
soln of K2Cr2O7
On boiling it with H2O2,
cooling it and then adding an aq soln of BaCl2 a ppt
insoluble in dil HCl is obtained.
On passing H2S a
white turbidity is obtained.
Identify X and give all
reactions taking place.
The gas liberated on heating a
mix of 2 salts with NaOH gives a reddish brown ppt with an alk soln K2HgI4.
The soln (aq) of the mix on treatment with BaCl2 gives a white pt
which is sparingly solution in conc HCl. On heating the mix with K2Cr2O7
and conc H2SO4 red vap of A are produced. The aq soln
of the mix gives a deep blue coloration B with pot ferricyanide soln.
Identify the radicals and write balanced eqns for formation of A and B?
A black colored compd A on
reaction with dil H2SO4 gives a gas B which on passing
in a soln of an acid C gives a white turbidity D. Gas B when passed thro
acidified soln of E gives a ppt F solution in dil HNO3. After
boiling this soln when an excess of ammonium hydroxide is added a blue
colored compd G is formed. To this soln on add of acetic acid and aq pot
ferrocyanide a chocolate ppt H is obtained. On addition of an aq soln of E a
white ppt insol in HNO3 is obtained. Identify A to H.
A mix of 2 salts were treated
The mix was heated with
manganese dioxide and conc H2SO4 when yellowish
green gas was obtained.
The mix on heating with sod
hydroxide soln gave a gas, which turned red litmus blue.
Its soln in water gave blue
ppt with pot ferricyanide and red coloration with amm thiocyanate.
The mix was boiled with pot
hydroxide and the liberated gas was bubbled thro an alk soln of K2HgI4
to give brown pt.
Identify the 2 salts. Give
ionic reactions for the tests (i) to (iii).
A certain inorganic compd A on
heating loses its water of crystallization. On further heating a blackish
powder B and 2 oxides of S - C and D are obtained, the powder B on boiling
with HCl gives a yellow soln E. When H2S is passed thro E a white
turbidity F and apple green soln G are obtained. The soln E on treatment
with thiocyanate ions gives a blood red color compd H. Identify A to H.
A green colored metallic
chloride A when treated with sod hydroxide and H2O2
gives a yellow soln due to the formation of compd B. The color of this soln
changes to orange when dil H2SO4 is added to it. It is
due to the formation of compd C. When KCl is heated along with C in presence
of conc H2SO4 a red volatile liq D is formed. The
compd C when treated with amm chloride forms compd E which decomposes on
heating giving a colorless gas F water and green residue G. When Mg is burnt
in the presence of F a white solid H is formed. The latter on hydrolysis
forms a gas I which gives white fumes with HCl. Identify A to I giving
Your are given a white material
which could be any of the following :
ZnO, ZnCO3, Zn(OH)2, ZnS, Zn(NH3)4Cl2.
What tests would you perform to identify the compd? Be specific. Tell what
reagents you could use and what observations you could make.
A white amorphous powder A on
heating yields a non-combustible gas B and a solid C. The latter compd
assumes a yellow color on heating and changes to white on cooling. C
dissolves in dil acids and the resultant soln gives a white ppt on adding
K[Fe(CN)4] soln. A dissolves in dil HCl with the evolution of a
gas which is identical in all respects with B. The gas B turns lime water
milky which disappears on continuous passage of it. The soln of A as
obtained above gives a white ppt D on addition of excess of NH4OH
and passing H2S. Anther portion of the soln gives initially a
white ppt E on addition of NaOH soln which dissolves on further addition of
base. Identify A-E.
A colorless solid A on heating
gives a white solid B and a gas C; B gives off reddish brown fumes on
treatment with dil acids. On heating with NH4Cl, B gives a
colorless gas D and a residue E. The compd A also gives colorless gas F on
heating with ammonium sulphate and white residue G. Both E and G impart
yellow color to the Bunsen flame. C forms white powder with strongly heated
Mg metal. The white powder forms Mg(OH)2 with H2O. The
gas D on the other hand is observed by heated Ca which gives off ammonia on
hydrolysis. Identify the substance A to G and give reactions for the changes
A mix of 3 gases A, B, C is
passed first into acidified dichromate solution when A is absorbed turning
the soln green. The remainder of the gas is passed through excess of lime
water which turns milky resulting in the absorption of B. The residual gas C
is absorbed by alk pyrogallol soln. However the original mix does not turn
lead acetate paper black. Identify A, B, C.