2C57H110O6(s) + 163 O2(g) → 114CO2(g) + 110H2O(l)
MnCl2 + K2S2O8 + H2O → KMnO4 + H2SO4 + HCl (equation not balanced).
Few drops of concentrated HCl were added to this solution and gently warmed. Further, oxalic acid (225 mg) was added in portions till the colour of the permanganate ion disappeared. The quantity of MnCl2 (in mg) present in the initial solution is ____.
(Atomic weights in g mol−1: Mn = 55, Cl = 35.5)
2Cu(s) + H2O(g) → Cu2O(s) + H2(g)
is the minimum partial pressure of H2 (in bar) needed to prevent the oxidation at 1250 K. The value of ln is ____.
(Given: total pressure = 1 bar, R (universal gas constant) = 8 J K−1 mol−1, ln (10) = 2.3. Cu(s) and Cu2O(s) are mutually immiscible.
At 1250 K: 2Cu(s) + ½ O2(g) → Cu2O(s); ΔGθ = −78,000 J mol−1
H2(g) + ½ O2(g) → H2O(g); ΔGθ = −1,78,000 J mol−1; G is the Gibbs energy)
[Molecular weight of ethanol is 46 g mol–1]
Among the following, the option representing change in the freezing point is -
The boiling point of 0.2 mol kg−1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?
6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is :
Assertion When methanol is added to water boiling point of water increases.
Reason When a volatile solute is added to a volatile solvent, elevation in boiling point is observed.
Assertion : Higher the molal depression constant of the solvent used, higher the freezing point of the solution.
Reason : Depression in freezing point does not depend on the nature of the solvent.
Assertion : The dissolution of ammonia in water does not follow Henry's law.
Reason : Ammonia undergoes ionisation in water as
Dissolving 120g of urea (mol.wt 60) in 1000g of water gave a solution of density 1.15g/mL. The molarity of the solution is
480 mL of 1.5 M first solution +520 mL of 1.2 M second solution.
What is the molarity of the final mixture?
The Henry’s law constant for the solubility of N2 gas in water at is . The mole fraction of N2 in air is 0.8. The number of moles of N2 from air dissolved in 10 moles of water at 298K and 5 atm pressure is
Reason H2C2O4.2H2O is a dihydrate organic acid.
Water is added to the solution M such that the fraction of water in the solution becomes 0.9. The boiling point of this solution is