Download App

Analytical Chemistry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAnalytical Chemistry3 Marks
Question
A student performs an experiment to identify an unknown cation present in a solution. The student adds a few drops of sodium hydroxide (NaOH) to the solution and observes the formation of a chalky white precipitate. When an excess of NaOH is added, the precipitate dissolves, forming a clear solution.
(a) Identify the cation.
(b) Write the balanced chemical equation for the reaction that leads to the formation of the white precipitate.
(c) What happens to the white precipitate when an excess of NH4OH is added?
✓

Answer

(a) The cation must be Pb2+.
(b) $Pb \left( NO _3\right)_2+2 NaOH \longrightarrow Pb ( OH )_2 \downarrow+2 NaNO _3$
(c) White precipitate is insoluble in excess of NH4OH.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[3 Mark Question Answer]" from Analytical Chemistry→Analytical Chemistry — all question types→Chemistry STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

Carbonic acid gives an acid salt but hydrochloric acid does not. Explain.
→
What are chlorofluorocarbons, why they become popular as substitute of ammonia as refrigerant?
→
(a) Explain what is meant by "molar volume of a gas."
(b) Calculate the number of moles of nitrogen in 7 grams of nitrogen.
→
Name the products formed and give appropriate chemical equations for the Ethanol oxidized by acidified potassium dichromate ?
→
Define a functional group and give the structural formula of the following functional group:
(a) Ketons
(b) Alcohols\
(c) Aldehydes
→
An organic compound contains $H =4.07 \%, Cl =71.65 \%$ chlorine and remaining carbon. Its molar mass $= 98.96.$ Find,
(a) Empirical formula, and
(b) Molecular formula
→
Find the percentage of water of crystallisation in $CuSO_4.5H_2O$. (At. Mass $Cu = 64, H = 1, O = 16, S = 32)$
→
How many electrons are required or released by each atom mentioned in (a) to attain the nearest noble gas configuration ?
→
Explain the following briefly:
Metals are electropositive.
→
The following questions relate to the extraction of aluminium by electrolysis :
(i) Name the other aluminium containing compound added to alumina and state its significance.
(ii) Give the equation for the reaction that takes place at the cathode.
(iii) Explain why is it necessary to renew the anode periodically.
→