Volume of CO3 obtained by the complete decomposition of 9.85 g BaCO3 is
2.24 L
1.12 L
0.84 L
0.56 L
B.
1.12 L
BaCO3 BaO + CO2
Molecular weight of BaCO3 = 137 + 12 + 16 × 3 = 197 u
197 g BaCO3 gives 22.4 L CO2 at NTP
9.85 g BaCO3 gives L CO2 at NTP
Therefore, volume of CO2 is 1.12 L
The reduction potential of three metallic ions X, Y and Z correspondingly are +0.52,-303 and -1.18 V. The sequence of reducing capacity of these metals will be
Y >Z >X
X >Y >Z
X >Z >Y
Z >X >Y
For the reaction . Which of the following is correct?
Mn2+ | CO2 | H+ | |
5 | 2 | 4 | 10 |
Mn+ | CO2 | H+ | |
2 | 5 | 10 | 16 |
Mn2+ | C2O | CO2 | H+ |
6 | 8 | 16 | 18 |
Mn2+ | C2O | CO2 | H+ |
10 | 12 | 24 | 12 |
Acidic K2Cr2O7 reacting with H2S2 the oxidation number of chromium is changed
from +3 to +6
from+6 to +3
from +6 to +2
remains unchanged
The process of oxidation involve
loss of electron
gain of electron
loss of proton
loss of neutron
The number of electrons transferred when KMnO4 acts as an oxidising agent to give MnO2 and Mn2+ respectively are
2, 3
1, 5
3, 5
1, 3
The reaction,
3ClO- (aq) → ClO (aq) + 2Cl- (aq) is an example of
oxidation reaction
reduction reaction
disproportionation reaction
decomposition reaction