Stoichiometry Indiabix Flashcards
CaCO3 contains __________ percent of Ca by weight.
40
Solutions which distil without change in composition are called
Azeotropic
The evaporation of aqueous solution of sugar causes its molarity to
remain unchanged.
One Newton is equal to __________ dynes.
10^5
A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to
x1/x2
The rate of material __________ is zero in case of a steady state system.
Accumulation
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the
equivalent weight of the metal is 4.
Molar heat capacity of water in equilibrium with ice at constant pressure is
∞
If pH value of a solution is 8, then its pOH value will be
6
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
18.11 kJ
Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
8/9
If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times.
1000
N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)
90%
6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be _
0.5
On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes
4
