Back to PRACTICAL CHEMISTRY
NEET UG CHEMISTRY MCQ: PRACTICAL CHEMISTRY
1
Hard
1 of 1
Analyzing
+4 | -1
A student is asked to determine the degree of
hydration of a salt by finding the mass of a
clean dried crucible and lid followed by the
mass of the crucible and lid containing a
sample of the salt. The crucible, lid and salt
are heated in a Bunsen burner flame, cooled,
and weighed. If the crucible, lid and salt are
heated only once instead of the recommended
three times, what will be the effect on the
degree of hydration compared with the actual
value?
hydration of a salt by finding the mass of a
clean dried crucible and lid followed by the
mass of the crucible and lid containing a
sample of the salt. The crucible, lid and salt
are heated in a Bunsen burner flame, cooled,
and weighed. If the crucible, lid and salt are
heated only once instead of the recommended
three times, what will be the effect on the
degree of hydration compared with the actual
value?
View answer and explanation
Correct option: B
Too low
Option A (Too low) is correct because if the heating is incomplete, some water of hydration will remain in the salt, leading to an overestimation of the mass of the anhydrous salt and an underestimation of the water lost, thus a lower degree of hydration.
More Questions from PRACTICAL CHEMISTRY
Practice All Chapter MCQs →
A pale green crystalline inorganic salt (A) dissolves freely in water. It gives a brown precipitate on addition of aqueous The solution of (A) also gives a black precipitate on bubbling in alkaline medium. An aqueous solution of the (A) decolorizes the pink colour of the permanganate solution. The metal in the salt solution is
of required of solution in acidic medium. Volume of required by of is
The ion that cannot be precipitated by both and is
The rapid change of pH near the stoichiometric point of an acid-base titration in the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugated acid and the base forms of the indicator by the expression.
On heating colourless solid gas (liquid at room temp.) and gas are formed. is decomposed by on heating to form gas giving white fumes with Gas occupies at N.T.P. Hence is
Standard solution is titrated to a pink phenolphthalein endpoint by adding a solution while stirring. If a solution becomes pink throughout but loses its color upon standing for a short time, what should be done to restore the color?