Advertisements
Advertisements
प्रश्न
1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is
विकल्प
0%
4.4%
16%
8.4%
Advertisements
उत्तर
16%
Explanation:
\[\ce{MgCO3 -> MgO + CO2 ^}\]
MgCO3: (1 × 24) + (1 × 12) + (3 × 16) = 84 g
CO2: (1 × 12) + (2 × 16) = 44g
100% pure 84 g MgCO3 on heating gives 44 g CO2
Given that 1 g of MgCO3 on heating gives 0.44 g CO2
Therefore, 84 g MgCO3 sample on heating gives 36.96 g CO2 = 100%
Percentage of purity of the sample = `(100%)/(44 "g CO"_2) xx 36.96` g CO2
= 84%
Percentage of impurity = 16%
APPEARS IN
संबंधित प्रश्न
When 6.3 g of sodium bicarbonate is added to 30 g of acetic acid solution, the residual solution is found to weigh 33 g. The number of moles of carbon dioxide released in the reaction is
Total number of electrons present in 1.7 g of ammonia is
The correct increasing order of the oxidation state of sulphur in the anions \[\ce{SO^2-_4, SO^2-_3, S2O^2-_4, S2O^2-_6}\] is
What do you understand by the term oxidation number?
Balance the following equation by the ion electron method.
\[\ce{KMnO4 + SnCl2 + HCl -> MnCl2 + SnCl4 + H2O + KCl}\]
Balance the following equation by the ion electron method.
\[\ce{C2O^2-_4 + Cr2O^2-_7 -> Cr^3+ + CO2}\] (in acid medium)
Reducing agent is a species that ____________.
In the redox reaction, \[\ce{2MnO^-_4 + SO^{2-}_3 + H2O -> 2MnO^{2-}_4 + SO^{2-}_4 + 2H^+}\], the reductant is:
Which one of the following CANNOT act as a reducing agent?
Which is the best oxidizing agent among the following?
