Colour and Solubility

Q.

Which Titration Is Known As Argentometric Titration?

Q.

What is hydrated and anhydrous salt?

Q.

How do you test for acetate?

Q.

Explain how anhydrous Cobalt chloride can be used in the detection of water.

Q.

Choose the correct option given to distinguish between Zinc nitrate solution and Calcium nitrate solution

1. Add sodium hydroxide solution to each of the solutions. The solution in which a white precipitate soluble in excess of sodium hydroxide is calcium nitrate and the one which forms a white precipitate insoluble in excess of sodium hydroxide is Zinc nitrate

2. Add lead nitrate solution to each of the solutions. The solution in which a white precipitate soluble in excess of sodium hydroxide is Calcium nitrate and the one which forms a white precipitate insoluble in excess of sodium hydroxide is Zinc nitrate

3. Add lead nitrate solution to each of the solutions. The solution in which a white precipitate soluble in excess of sodium hydroxide is Zinc nitrate and the one which forms a white precipitate insoluble in excess of sodium hydroxide is Calcium nitrate

4. Add sodium hydroxide solution to each of the solutions. The solution in which a white precipitate soluble in excess of sodium hydroxide is Zinc nitrate and the one which forms a white precipitate insoluble in excess of sodium hydroxide is Calcium nitrate

Q.

State three applications of the solubility curve.

Q.

How do you test for hydrogen sulfide in the water ?

Q.

Select the correct answers :

(a) Colour of an aqueous solution of copper sulphate is

(i) Green (ii) Brown (iii) Blue (iv) Yellow

(b) Colour of the precipitate formed on adding $NaOH$ solution to iron (II) sulphate solution is

(i) White (ii) Brown (iii) Green (iv) Pale blue

(c) A metal which produces hydrogen on reacting with alkali as well as with acid.

(i) Iron (ii) Magnesium (iii) Zinc (iv) Copper

Q. The hydrated salt of Na2CO3.xH2O undergoes 63% loss in mass on heating and becomes anhydrous. The value of x is

Q.

Give a chemical test to distinguish between the following :

(a) Ammonium chloride and sodium chloride,

(b) Ferric salt and ferrous salt,

(c) Sodium sulphate and ammonium sulphate.

Q.

A solution of common salt when added to silver nitrate solution yields a precipitate of silver chloride(0.28 g). Find the mass of sodium chloride in the solution.

1. 1.14 g

2. 0.114 g

3. 11.4 g

4. 2 g

Q.

Identify the anion present in the salt on the basis of the reaction given below

When a freshly prepared solution of ferrous sulphate is added to a salt solution and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.

1. Iodide

2. Nitrate

3. Chloride

4. Sulphide

5. Oxide

6. Carbonate

7. Sulphite

8. Bromide

Q.

Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?

1. Iron(II) sulphate and Magnesium sulphate

2. Iron(III) chloride and Zinc chloride

3. Iron(II) sulphate and Iron(III) chloride

4. Copper nitrate and Lead nitrate

5. Lead nitrate and Zinc chloride

Q.

How will you distinguish lead carbonate and zinc carbonate in solution ?

Q.

Identify the Cation: To solution Z, a small quantity of Sodium hydroxide solution is added and then in excess.

A white precipitate is formed which remains insoluble?

Q.

Choose the correct answer from the options given below.

The salt solution which does not react with Ammonium hydroxide

1. Calcium nitrate

2. Zinc nitrate

3. Lead nitrate

4. Copper nitrate

Q. Select from the list given (a to e) one substance in each case which matches the description given in parts (i) to (v). (Note: Each substance is used only one in the answer.)
(a) Nitroso Iron (II) sulphate
(b) Iron (III) chloride
(c) Chromium sulphate
(d) Lead (II) chloride
(e) Sodium chloride.
(i) A compound which is deliquescent.
(ii) A compound which is insoluble in cold water, but soluble in hot water.
(iii) The compound responsible for the brown ring during the brown ring test of nitrate ion.
(iv) A compound whose aqueous solution is neutral in nature.
(v) The compound which is responsible for the green colouration when sulphur dioxide is passed through acidified potassium dichromate solution.

Q.

X, Y and Z are three crystalline solids which are soluble in water and have a common anion. To help you to identify X, Y and Z, you are provided with the following experimental observations.

A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turnings added to mixture.

INFERENCE : The common anion is the..........ion.

1. PO₄^3-

2. SO₄^2-

3. SO₃^2-

4. NO₃^-

5. CO₃^2-

6. Cl^-

7. Br^-

8. I^-

9. NO₂^-

Q. Which of the given chemical reactions is not feasible?

1. $Fe\left(s\right)+CuS{O}_4\left(aq\right)\to FeS{O}_4\left(aq\right)+Cu\left(s\right)$
2. $Zn\left(s\right)+MgS{O}_4\left(aq\right)\to ZnS{O}_4\left(aq\right)+Mg\left(s\right)$
3. $Mg\left(s\right)+FeS{O}_4\left(aq\right)\to MgS{O}_4\left(aq\right)+Fe\left(s\right)$
4. $Cu\left(s\right)+A{g}_{2}S{O}_4\left(aq\right)\to CuS{O}_4\left(aq\right)+2Ag\left(s\right)$

Q.

A strip of copper is placed in four different colourless salt solutions. They are $KN{O}_3,AgN{O}_3,Zn\left(N{O}_3{)}_{2}Ca\right(N{O}_3{)}_2$. Which one of the solution will finally turn blue?

Q.

Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it

1. Iron(III) chloride

2. Copper nitrate

3. Iron(II) sulphate

4. Lead nitrate

5. Magnesium sulphate

6. Zinc chloride

Q.

You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:
(a) only copper hydroxide
(b) only zinc hydroxide
(c) both copper hydroxide and zinc hydroxide.

Q. Give the name of a soluble lead salt and write the equation for the action of heat on this salt. Write the equation for the preparation of nitric acid from potassium nitrate.

Q.

Both Zinc sulphate and Lead nitrate are colorless solid substances. Write the chemical reaction used to identify them.

Q.

_{A drop of water is poured over a white powdery substance. Then it is observed that the substance turns blue. Answer the following questions :}

_{(i) What is the white powdery substance?}

_{(ii) Why does the substance change to blue colour?}

_{(iii) Write the chemical formula of the blue substance .}

_{(iv) Is the blue substance an acidic salt or a basic salt?}

_{(v) Give a reason for your answer in (iv).}

Q.

When ammonium hydroxide is added to solution B, a plae blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation [positive ion] present in solution B ? What is the probable colour of solution B.

Q.

Explain the following term.

Coloured glass

Q.

X, Y and Z are three crystalline solids which are soluble in water and have a common anion.

To help you to identify X, Y and Z, you are provided with the following experimental observation.

When Z is heated it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.

INFERENCE: Z contains the __________ cation.

1. Na⁺

2. K⁺

3. Zn²⁺

4. Fe²⁺

5. Al³⁺

6. Ca ²⁺

7. Pb²⁺

8. Cu²⁺

9. Fe²⁺

10. Mg²⁺

11. NH₄⁺

12. Fe³⁺

Q. Taking sodium carbonate as an example, give the meaning of the following terms:
(i) water of crystallisation
(ii) anhydrous

Q. (c) Name a substance which changes the blue colour of copper sulphate crystals to white.