問題一覧
1
HgCl2 + Na2CO3 ---> A(ppt).... A?
HgCO3.3Hgo, reddish brown
2
H3PO4 --∆--> A --∆--> B --∆--> C..... No of sigma bonds of anion of B if value of n is 3
12
3
Heating what produces water, NO2, O-atom?
conc. HNO3
4
Butterfly compound on heating produce A and (1/2)O2... Formula,nature and colour of A?
Cr2O3, amphoteric, green
5
Phenophthalein on mixing with a solution turns pink. solution contains?
CO3(2-)
6
H2CO3 decomposes in?
aqueous solution , normal temperature
7
HgO on heating turns
yellow to red
8
SO3(2-) + AgNO3 ----> A ----> B.... B is only formed when AgNO3 is taken in excess, formula of B
AgSO3, white
9
CaSO4.2H2O -∆-> A.(1/2)H2O -∆-> B -∆-> C + SO3.... Name of A and B
Plaster of paris, dead burn plaster
10
If anion is oxidising agent, NH4(+) can form?
N2, N2O
11
In carbonate anion's test with dil. HCl which of the following is formed?
NaCl + H2O + CO2
12
CO2 + Ca(OH)2 gives
H2O + CaCO3
13
Final products of heating of CuSO4.5H2O? (T~750°C)
CuO + SO3
14
Pb(NO3)2 + Na2CO3 ---> A(ppt) + B.... Formula and colour of A
PbCO3, white
15
Before performing test of anion, soda extract is neutralised with suitable acid?
To end the basic effect of sodium ion, To get rid of interrupting carbonate anion
16
Amphoteric metals are soluble in?
acids, bases
17
AgNO3 + Na2CO3 ---> A(ppt) + B.... A?
Ag2CO3, y/w
18
Test of sulphite with acid releases?
SO2 gas
19
Salts which give ppt with CO3 and solution with HCO3-?
BaCl2, CaCl2, Pb(NO3)2, HgCl2, Hg2(NO3)2
20
Heating what produces water, NO, O-atom
dil. HNO3
21
Yellow messicote on heating becomes?
red, litharge
22
NH4Cl on heating gives
NH3 + HCl
23
HCO2Na gives?
Na2C2O4 + H2
24
NH4IO3 on heating gives?
2NH4IO3 ----> I2 + 4H2O + N2 + O2
25
H2SO4 on heating gives ? (T~800°C)
H2O + SO2 + O
26
ZnO on heating turns?
white to yellow
27
compounds of which metal changes their oxidation state on heating?
Fe, Mn
28
H3PO3 on heating gives?
4H3PO3 --> 3H3PO4 + PH3
29
H3PO4 --∆--> A --∆--> B --∆--> C.... Name compound which forms polymer
B, metaphosphotic acid
30
On heating KHCO3 followed by BaCl2 finally gives ppt?
BaCO3, white
31
In preparation of soda extract insoluble salt and sodium carbonate is taken in ratio of?
1:3
32
(NH4)2Cr2O7 on heating gives?
Cr2O3 + 4H2O + N2
33
H3PO4 --∆--> A --∆--> B --∆--> C..... Formula of A
H4P2O7
34
AuCl3 on heating gives
Au + 2Cl
35
Heating PbCl4 gives?
PbCl2 + Cl2
36
HNO2 on heating gives?
3HNO2 --> H2O + 2NO + HNO3
37
Heating FeCl3.6H2O gives?
Fe2O3 + HCl + H2O
38
KMnO4 + H2SO4 ---> ?(when SO2 is passed)
MnSO4 + K2SO4 + H2O + O
39
CuSO4.5H2O --∆-> A.H2O --∆-> B --∆-> C + SO3. Colour of B and C?
white, black
40
NH4NO3 on heating gives?
N2O + 2H2O
41
CO3(2-) + CaCl2 gives
white ppt, CaCO3
42
Heating KMnO4 gives?
K2MnO4 + MNO2 + O2
43
Test of bicarbonate with NH4OH followed by MgCl2 gives?
MgCO3, white
44
H3BO3 --∆--> A --∆--> B --∆--> C..... Compound which form polymer?
A, Metaboric acid, HBO2
45
Ag(+) + NH4OH --->
[Ag(NH3)2](+)
46
If anion is not oxidising agent NH4(+) on heating forms?
NH3
47
M(OAc) on heating gives?
MCO3 + CH3COCH3
48
CaCl2.62O --> CaCl2.4H2O --> CaCl2.2H2O -->CaCl2.... Colour of these salts respectively?
pink, blue, red, blue
49
SO3(2-) + AgNO3 ----> A ----> B..... Formula of A?
[AgSO3](-)
50
On heating Ag2CO3 (dry) ?
Ag + CO2 + 1/2O2
51
No of sigma bonds in metaphosphoric acid if n = 4
20
52
In lime water test which of the following is formed?
white turbidity of CaCO3
53
Hg2O on heating show disproportionation reaction as?(due to inert pair effect)
HgO + Hg
54
K2SO4.Al2(SO)3.24H2O on heating gives?
K2SO4 + Al2O3 + SO3
55
When SO2 is passed through acidify KMnO4?
Pink colour of solution turns colourless
56
NH4NO2 on heating gives?
N2 + 2H2O
57
LiNO3 on heating gives?
Li2O + NO2 + (1/2)O2
58
Colour of I(-) is?
Violet
59
Pb2O4 --∆--> PbO + O..... Colour of Pb2O4 and PbO are?
reddish brown to red
60
BaCl2 test is for ?
Both
61
LiCO3 on heating gives?
Li2O + CO2
62
which of the following hydrolyse?
MgCl2.6H2O
63
Lime water test is possible of identification of?
CO2, SO2
64
Hg2Cl2 on heating gives?
HgCl2 + Hg
65
Heating AgCO3 in aq suspension?
Ag2O + CO2
66
Nitrate of which metal forms complex on heating?
Be
67
SO3(2-) + AgNO3 ----> A ----> B..... A when boiled forms?
Ag(ppt) + SO4(-) + SO2(gas)
68
H3PO2 on heating gives?
2H3PO2 --> H3PO4 + PH3
69
Na2SO4 + BaCl2 --> A(ppt) + B.... formula and colour of A?
BaSO3, white
70
Order of solubility in aqueous NH3? 1) AgCl 2) AgBr 3) AgI
1>2>3
71
H2SO3 on heating gives
3H2SO3 --> 2H2SO4 + S⬇️ + H2O
72
Hg2(NO3)2 + Na2CO3 ---> A(ppt) + B..... Formula and colour of A?
Hg2CO3, yellow
73
(NH4)2SO4 on heating gives
NH3 + H2O + SO3
74
When SO2 is taken in excess which compound is formed?
Ca(HSO3)2
75
Conversion of BaSO3 to BaSO4 can be fastened by adding?
Br2 + H2O, HNO3, H2O2
76
Orange colour of K2Cr2O7 + H2SO4 produces ?(on passing SO2)
Cr2(SO4)3 (green) + K2SO4 + H2O + O
77
Ag2CO3 soluble in aqueous ammnia gives explosion due to formation of?
fulminating silver, Ag3N
78
H3PO4 --∆--> A --∆--> B --∆--> C.... Name of A and formula of C?
Pyrophosphoric acid, P2O5
79
BaSO4 due to high lattice enthalpy is soluble in ?
conc. H2SO4
80
HgI2 on heating turns
Red to yellow
81
FeSO4.7H2O on heating gives
Fe2O3 + SO2 + SO3
82
Na2CO3 + BaCl2 --> A(ppt) + B.... Name and colour of A
BaCO3, white
83
Heating PbBr4 gives?
PbBr2 + Br2
84
CaCO3.MgCO3 --∆--> ?
CaO + MgO + (2)CO3
85
Ag(+) + S2O3(2-) -->
[Ag(S2O3)2](3-)
86
H2SO4 on heating gives? (T~444°)
H2O + SO3
87
Chloride of which metal does not give chloride?
Hg
88
On standing BaSO3 what happens?
BaSO4(dense white)
89
Name A and B
slaked lime, lime water
90
Basic beryllium nitrate on heating forms a complex with formula?
[Be4O(NO3)6]
91
Na2SO4 + Pb(NO3)2 ---> A(ppt) + B.... A?
PbSO3, white
92
Colour of Br(-) is ?
Reddish brown
93
Ag(+) salt soluble in?
CN(-), S2O3(2-), HNO3, aq NH4OH
94
Bi carbonate of which exists in solid state?(rest all solution state)
Na
95
Carbonates of I A group are more soluble then bicarbonates because?
no H-bonding
96
Final products of heating of CuSO4.5H2O? (T>800°C)
CuO + SO2 + O
97
Ag(+) + CN(-) --->
[Ag(CN)2](-)
98
Colour of NO2(-) and NO3(-) is?
Brown
99
If CO2 is taken in excess in lime water test a soluble compound is formed
Ca(HCO3)2