## Frank ICSE Solutions for Class 10 Chemistry – Analytical Chemistry

**PAGE NO : 75**

**Solution 1:**

- Cuprous salts = Colourless
- Cupric salts = Blue
- Aluminium salts = Colourless
- Ferrous salts= Light green
- Ferric salts = Yellow
- Calcium salts = Colourless

**Solution 2:**

**Solution 3:**

**Solution 4: **K

_{2}SO

_{4.}

**Solution 5:**

**Solution 6:**

**Solution 7:**

**Solution 8:**

**Solution 9:**

Examples of amphoteric hydroxides are: Zn(OH)2, Al(OH)3.

**Solution 10:**

**Solution 11:**

**PAGE NO : 76**

**Solution 12:**

**Solution 13:**

The chloride of a metal which is soluble in excess of ammonium hydroxide is zinc chloride i.e. ZnCl2.

**Solution 14:**

**Solution 15:**

- PbO
- Al2O3
- Na2ZnO2

**Solution 16:**

- transition, Cr
^{3+}, Fe^{2+}, MnO_{4}^{4-}. - Zn(OH)
_{2} - NH
_{4}Cl - Al
_{2}O_{3}, Al - NH
_{4}OH

**Solution 1992-1:**

- Addition of KCN
- Addition of excess of NaOH.
- Addition of excess ofNH
_{4}OH

**Solution 1993-1:**

**PAGE NO : 77**

**Solution 1995-1:**

- The metal ion present in solution A is Pb
^{2+}

. - The cation present in solution B is Cu
^{2+}. The probable colour of solution B is blue.

**Solution 1996-1:**

**Solution 1996-2: ** The solutions for the tests will be prepared by dissolving the given powders separately in water.

**Solution of Calcium carbonate:**

Calcium carbonate is CaCO_{3 }and contains Ca^{2+ }ions. Sodium hydroxide solution NaOH can be used to identify Ca^{2+ }since its addition to calcium carbonate solution will give white precipitates of Ca(OH)2 which are sparingly soluble in excess of NaOH.

**Solution of Lead carbonate:**

Lead carbonate is PbCO_{3}and contains Pb2+ ions. Ammonium hydroxide solution NH4OH can be used to identify Pb^{2+ }since its addition to lead carbonate solution will give white precipitates of Pb(OH)2 which are insoluble in excess of NH4OH.**Solution of Zinc carbonate:**

Zinc carbonate is ZnCO3 and contains Zn^{2+ }ions. Sodium hydroxide solution NaOH can be used to identify Zn^{2+}since its addition to zinc carbonate solution will give white gelatinous precipitates of Zn(OH)_{3 }which are soluble in excess of NaOH.

**Solution 1996-3:**

**Solution 1997-1:**

**Solution 1998-1:**

**Solution 1999-1:**

**Solution 2000-1:**

**PAGE NO : 78**

**Solution 2001-1:**

**Solution 2003-1:**

**Solution 2003-2:**

**Solution 2004-1:**

**PAGE NO : 79**

**Solution 2005-1:**

- B and E (Iron (II) sulphate and Magnesium sulphate)
- C and F (Iron (III) chloride and Zinc chloride)
- D (Lead nitrate)
- A (Copper nitrate)
- F (Zinc chloride)

**Solution 2006-1:**

**Solution 2009-1:**

C ( Aluminium oxide)

**Solution 2009-2:**

- P is Ferric chloride
- Q is an ammonium salt
- R is ferrous sulphate

**Solution 2009-3:**

- When BaCl
_{2} - solution is added to the given solution ZnSO
_{4} - gives a white precipitate while no precipitate is obtained with ZnCl
_{2 }solution. - When NaOH solution is added to the given solution, iron (II) chloride gives dirty green precipitate while reddish brown precipitate is obtained with iron(III) chloride.