Which one of the following is not true at room temperature and pressure?
P4O10 is white solid
SO2 is a colourless gas
SO3 is a colourless gas
NO2 is a brown gas
An element belongs to group 15 and third period of the Periodic Table. Its electronic configuration wil be
1s22s22p3
1s22s22p4
1s22s22p63s23p3
1s22s22p63s23p2
In the brown ring complex [Fe(H2O)5(NO)]SO4, nitric oxide behaves as
NO+
neutral NO molecule
NO-
NO2-
Platinum, palladium and iridium are called noble metals because
Alfred Nobel discovered them
they are shining lustrous and pleasing to look at
they are found in native state
they are inert towards many common reagents
NO2 is not obtained on heating
AgNO3
KNO3
Cu(NO3)2
Pb(NO3)2
B.
KNO3
NO2 is not obtained by heating KNO3. Although when other compounds are heated, they give following reactions:
2AgNO3 2Ag + 2NO2 + O2
2KNO3 2KNO2 + O2
2Cu(NO3)2 2CuO + 4NO2 + O2
2Pb(NO3)2 2PbO + 4NO2 + O2
A solution of KMnO4 is reduced to a various products depending upon its pH. At pH<7, it is reduced to a colourless solution (A), at pH =7 it forms a brown precipitate (B) and at pH> 7, it gives a green solution (C).(A), (B) and (C) are
A | B | C |
Mn2+ | MnO2 |
A | B | C |
MnO2 | Mn2+ |
A | B | C |
Mn2+ | MnO2 |
A | B | C |
Mn2+ | MnO2 |
Which two sets of reactants best represents the amphoteric character of Zn(OH)2?
Set I - Zn(OH)2(s) and OH- (aq)
Set II - Zn(OH)2(s) and H2O (I)
Set III - Zn(OH)2 (s) and H+ (aq)
Set IV - Zn(OH)2(s) and NH3 (aq)
III and II
I and III
IV and I
II and IV
An organic compound having carbon, hydrogen and sulphur contains 4% of sulphur. The minimum molecular weight of
the compound is
200
400
600
800