Lead Ion

Q.

What do you observe when barium chloride solution is added to dilute sulphuric acid?

Q. Name the gas produced on warming ammonium sulphate with sodium hydroxide solution.

Q.

on passing excess co2 through limewater it first turns milky and then becomes colourless ? and write the chemical equations?

Q.

What is observed when to a solution of lead hydroxide, an excess of sodium hydroxide is added?

1. A clear solution of sodium plumbite is obtained.

2. A chalky white precipitate of sodium plumbite is obtained.

3. A white precipitate of lead oxide is formed.

4. No precipitate is formed.

Q.

(i) Draw a labelled diagram and explain the laboratory preparation of hydrogen chloride gas. Give the balanced equations.
(ii) How will you prove that the gas prepared is HCl?
(iii) Name the drying agent used to dry HCl gas.
(iv) How is the gas collected and why?
(v) What are the important precautions?

Q.

When lead react with NaOH, a colourless salt X is formed along with hydrogen. Name the salt X.

1. Sodium plumbate

2. Potassium plumbate

3. Lead hydroxide

4. Lead oxide

Q.

When an excess of sodium hydroxide is added to lead nitrate, a ____ precipitate of lead (II) oxide is formed.

1. Blue

2. Green

3. Reddish brown

4. Yellow

Q.

What is observed when to a solution of lead nitrate, a small amount of sodium hydroxide is added?

1. The precipitate dissolves to give a colourless solution.

2. A white precipitate of lead oxide is formed.

3. A white precipitate of lead hydroxide is formed.

4. none of the above.

Q. colour of lead nitrate and lead oxide

Q.

State your observation, when excess sodium hydroxide is added to calcium nitrate solution.

Q.

$Pb+2KOH(hotconc.)$$\to$___+___

1. $K_{2}Pb{O}_2$

2. $H_2$

3. PbO

4. $Pb(OH{)}_2$

Q. Using sodium hydroxide solution, how would you distinguish:
(a) Ammonium sulphate from sodium sulphate.
(b) Zinc nitrate solution from calcium nitrate solution.
(c) Iron (II) chloride from Iron (III) chloride.

Q. What happens when Calcium hydroxide is heated?

Q. (a) Sodium hydroxide solution can be used to distinguish between (i) Iron (II) sulphate solution and (ii) iron (III) sulphate solution; because these solutions give different coloured precipitates with sodium hydroxide solution. Give the colour of the precipitate formed with each of the solution.
(b) What will you observe when barium chloride solution is added to iron (II) sulphate solution?
(c) How will the action of dilute hydrochloric acid on sodium carbonate and sodium sulphite enables you to distinguish between these two compounds?

Q. STATE WHICH OF THE FOLLOWING METHODS IS GENERALLY USED FOR PREPARATION OF THE SALTS 1-5 GIVEN BELOW:
A. Neutralisation (insoluble base and dilute acid)
B. Neutralisation (Alkali and dilute acid)
C. Simple displacement (active metal and dilute acid)
D. Direct combination
E. Precipitation (double decomposition)

1. PbCO_​​​3
2. Zn(NO_{​​​​​3})₂
3. NaCl
4. Cu(NO_{​​​​​3})₂
5. FeS

Q. What do you observe when
(i) Excess ammonia is mixed with chlorine.
(ii) Ammonia in excess is mixed with chlorine.
(iii) Filter paper dipped in colourless phenolphthalein is introduced into ammonia.
(iv) Ammonia is passed over heated lead oxide.
(v) Ammonia solution is added to ferric chloride solution.
(vi) Ammonia solution is added drop by drop and then in excess to aqueous copper sulphate solution.
(vii) Ammonia comes in contact with the eyes of a person.

Q.

State relevant observation: Action of Sodium hydroxide solution on Ferrous sulphate solution.

Q.

When lead reacts with NaOH, a colourless salt X is formed along with hydrogen gas. Name the salt X.

1. Lead hydroxide

2. Potassium plumbate

3. Sodium plumbate

4. Lead oxide

Q.

When hot concentrated potassium hydroxide is added to lead, potassium oxide is obtained as the major product and hydrogen gas is liberated in the process.

1. False

2. True

Q. Complete the given table when $Pb(N{O}_3{)}_2$ reacts with $NaOH$ and $N{H}_{4}OH$.

$\begin{array}{ccc}\text{For}Pb(N{O}_3{)}_2& \text{NaOH}& N{H}_{4}OH\\ \text{Colour}& \text{Chalky white precipitate}& X\\ \text{Solubility}& \text{Precipitate formed will be soluble}& Y\\ & \text{in excess NaOH}& \end{array}$

1. X : Dirty green precipitate
   Y : Precipitate formed will be soluble in excess $N{H}_{4}OH$
2. X : Chalky white precipitate
   Y : Precipitate formed will be insoluble in excess $N{H}_{4}OH$
3. X : Chalky white precipitate
   Y : Precipitate formed will be soluble in excess $N{H}_{4}OH$
4. X : Gelatinous white precipitate
   Y : Precipitate formed will be insoluble in excess $N{H}_{4}OH$

Q.

State your observation, when excess sodium hydroxide is added to calcium nitrate solution.

Q. What do you observe when caustic soda solution is added to the following solution: first a little and then in excess
(a) FeCl₃
(b) ZnSO₄
(c) Pb(NO₃)₂
(d) CuSO₄

Q.

What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?

Q. (a) What happens when dilute hydrochloric acid is added to lead nitrate solution.
(b) Describe the two colour changes which take place when moist blue litmus is placed in a gas jar of chlorine.
(c) What is the colour change that takes place when chlorine water is exposed to sunlight? [5 MARKS]

Q.

What are the observations when lead nitrate is heated?

Q. State what you observe when:
(i) Neutral litmus solution is added to alkaline solution.
(ii) Ammonium hydroxide is added to iron (III) sulphate solution.
(iii) Lead nitrate and sodium chloride are mixed.
(iv) Ethane is bubbled through a solution of bromine in tetrachloromethane (carbon tetrachloride).
(v) Sulphur burns.

Q.

(a) State what happens when:
(i) Copper sulphate solution is electrolysed using a platinum anode.
(ii) Excess ammonia is passed through an aqueous solution of lead nitrate.
(iii) Washing soda is left exposed to dry air for long time.
(iv) Silver nitrate solution is added to dil. HCl.
(v) Hot concentrated sulphuric acid is added to sodium chloride crystals.

Q. $ZnS{O}_4$ and $Pb(N{O}_3{)}_2$ have similar powdery white appearance. So, which of the given options help us to identify $Z{n}^{2+}$ and $P{b}^{2+}$ when both are treated with $NaOH$ and $N{H}_{4}OH$?

1. Formed precipitate $Zn(OH{)}_2$ is soluble in excess $NaOH$
2. Formed precipitate $Pb(OH{)}_2$ is insoluble in excess $NaOH$
3. Formed precipitate $Zn(OH{)}_2$ is insoluble in excess $N{H}_{4}OH$
4. Formed precipitate $Pb(OH{)}_2$ is insoluble in excess $N{H}_{4}OH$

Q.

2.State one appropriate observation for each of following :

(i) Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper sulphate.

(ii) Excess of chlorine gas is reacted with ammonia gas.

(iii) Copper sulphide is treated with dilute hydrochloric acid.

(iv) A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution.

(v) Electricity is passed through molten lead bromide.

Q. A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains what?