Iron Ion

Q. When crystals of copper sulphate are strongly heated the residue obtain is
a) red in colour
b) colourless
c)green in colour
d)blue in colour

Q. The name and the colour of the precipitate formed when sodium hydroxide is added to $FeC{l}_3$ is ___ and ___ respectively.

1. Sodium ferrate, colourless
2. Sodium chloride, golden
3. Iron(II) hydroxide, dark brown
4. Iron(III) hydroxide, reddish brown

Q.

$FeC{l}_3$ reacts with ammonium hydroxide to give a reddish brown precipitate of metallic hydroxide which is insoluble in excess of $N{H}_{4}OH$. Name this precipitate.

1. Fe(OH)₂

2. Fe(OH)₃

3. Fe(OH)₄

4. NaOH

Q.

The colour of iron sulphate salt is :

1. Pink

2. Green

3. Blue

4. Colourless

Q.

The precipitate obtained when ammonium hydroxide is added to Iron (II) sulphate is _____ in colour.

1. reddish brown

2. dirty green

3. dirty white

4. white

Q.

Identify the substances based on the information given below and choose the correct option:

The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.

1. Ammonium sulphate

2. Barium sulphate

3. Ferrous sulphate

4. Ferrous Chloride

5. Ferric sulphate

6. Ferric chloride

7. Zinc chloride

Q.

Choose the correct option given to distinguish between Iron(II) chloride solution and iron(III) chloride solution

1. Add sodium hydroxide solution to each of the solutions. The solution in which a dirty green precipitate is formed is Iron (III) chloride and the other in which no effect is Iron (II) chloride

2. Add sodium hydroxide solution to each of the solutions. The solution in which a dirty green precipitate is formed is Iron(II)chloride and the other in which a brown gelatinous ppt if formed is Iron (III) chloride

3. Add sodium hydroxide solution to each of the solutions. The solution in which a dirty green precipitate is formed is Iron (II) chloride and the other in which no effect is Iron (III) chloride

4. Add sodium hydroxide solution to each of the solutions. The solution in which a brown gelatinous precipitate is formed is Iron (II) chloride and the other in which no effect is Iron (III) chloride

5. Add sodium hydroxide solution to each of the solutions. The solution in which a brown gelatinous precipitate is formed is Iron (III) chloride and the other in which no effect is Iron (II) chloride

6. Add sodium hydroxide solution to each of the solutions. The solution in which a dirty green precipitate is formed is Iron(III)chloride and the other in which a brown gelatinous ppt if formed is Iron (II) chloride

Q.

What is the colour of calcium bi carbonate?

Q.

What is the reaction of freshly precipitated aluminium hydroxide with caustic soda solution? Give equation.

Q.

Choose the correct option given to distinguish between Iron(II) chloride and Copper chloride solution

1. Add sodium hydroxide solution to each of the solutions. The solution in which a dirty green precipitate is Iron(II) chloride and the one which forms a blue precipitate is Copper chloride

2. Add sodium hydroxide solution to each of the solutions. The solution in which a blue precipitate is Iron(II) chloride and the one which forms a dirty green precipitate is Copper chloride

3. Add sodium hydroxide solution to each of the solutions. The solution in which a blue precipitate is Iron(II) chloride and the one which forms a b brown precipitate is Copper chloride

4. Add sodium hydroxide solution to each of the solutions. The solution in which a brown precipitate is Iron(II) chloride and the one which forms a blue precipitate is Copper chloride

Q. Write the name and the colour of the precipitate formed when sodium hydroxide is added to $FeC{l}_3$ solution.

Q. The name and the colour of the precipitate formed when sodium hydroxide is added to $FeC{l}_3$ is ___ and ___ respectively

1. Sodium ferrate and Colourless
2. Iron(II) hydroxide and Dark brown
3. Iron(III) hydroxide and Reddish brown
4. Sodium chloride and Golden

Q. A yellow coloured subatance changed into brown colour when it was kept in sunlight . What is that substance

Q.

When a green coloured compound reacts with ammonium hydroxide, a dirty green ppt. is formed along with ammonium sulphate. The precipitate formed is:

1. Ferric hydroxide

2. Ferrous hydroxide

3. Copper (II) hydroxide

4. Zinc hydroxide

Q.

The precipitate formed when ammonium hydroxide is added to $FeC{l}_3$ is of :

1. Iron (II) hydroxide

2. Iron (III) hydroxide

3. Iron (II) oxide

4. Iron (III) oxide

Q.

Which solution gives a white precipitate with excess ammonium hydroxide solution.

1. Zinc chloride

2. Iron(III) chloride

3. Lead nitrate

4. Copper nitrate

5. Iron(II) sulphate

6. Magnesium sulphate

Q.

A pale green compound X reacts with caustic soda to form dirty green gelatinous precipitate along with sodium sulphate. Name this precipitate.

1. Copper hydroxide

2. Zinc hydroxide

3. Ferric hydroxide

4. Ferrous hydroxide

Q. Complete the given table when $FeS{O}_4$ reacts with $NaOH$ and $N{H}_{4}OH$.

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

1. X : Chalky white precipitate
   Y : Precipitate formed will be soluble in excess $NaOH$
2. X : Dirty green precipitate
   Y : Precipitate formed will be soluble in excess $NaOH$
3. X : Dirty green precipitate
   Y : Precipitate formed will be insoluble in excess $NaOH$
4. X : Gelatinous white precipitate
   Y : Precipitate formed will be soluble in excess $NaOH$

Q.

When a green coloured compound reacts with ammonium hydroxide, a dirty green ppt. is formed along with ammonium sulphate. The precipitate formed is:

1. Ferric hydroxide

2. Ferrous hydroxide

3. Copper (II) hydroxide

4. Zinc hydroxide

Q.

1. True
2. False

Q. From the list of substances given-Ammonium sulphate, Lead carbonate, chlorine, Copper nitrate, Ferrous sulphate -State a solution of the compound which gives a dirty green precipitate with sodium hydroxide.

Q.

The name and the colour of the precipitate formed when sodium hydroxide is added to $FeC{l}_3$ is ___ and ___ respectively.

Q.

Salts of which of the following ion give rise to form coloured solution?

1. $C{u}^{2+}$

2. $N{a}^{+}$

3. $C{a}^{2+}$

4. $Z{n}^{2+}$

Q. Which of the following substance is responsible for the yellow colour of glass?

1. Chromium compound
2. Ferric compound
3. Cobalt compound
4. Calcium carbonate

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

Q. A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide, is

1. Calcium chloride
2. Ferrous chloride
3. Ferric chloride
4. Copper chloride

Q. What is observed when ferrous sulphate reacts with sodium hydroxide solution?

1. Gelatinous white precipitate
2. Insoluble green precipitate
3. Insoluble pale blue precipitate
4. Soluble green precipitate

Q. Which of following mixture will give green precipitate?
(I) $KMn{O}_4+KOH(aq.)$ (highly basic medium)
(II) $CuS{O}_4+K_3\left[Fe{\left(CN\right)}_6\right]$
(III) $H{g}_{2}C{l}_2+KI$
(IV) $FeC{l}_3(aq.)+H_{2}S$

1. I and II
2. I and IV
3. II and III
4. None of the above
   

Q.

What is the precipitate formed when a pale green compound reacts with caustic soda to form dirty green gelatinous precipitate along with sodium sulphate?

1. Ferric hydroxide

2. Ferrous hydroxide

3. Copper hydroxide

4. Zinc hydroxide

Q. 632 g of sodium thiosuphate $\left(N{a}_2{S}_2{O}_3\right)$ reacts with copper sulphate to form cupric thiosulphate which is reduced by sodium thiosulphate to given cuprous compound which is dissolved in excess of sodium thiosulphate to form a complex compound sodium cuprothiosulphate $N{a}_4\left[C{u}_5\right(S_2{O}_3{)}_5\left]\right)$ $CuS{O}_4+N{a}_2{S}_2{O}_3\to Cu{S}_2{O}_3+N{a}_{2}S{O}_4$
$2Cu{S}_2{O}_3+N{a}_2{S}_2{O}_3\to C{u}_2{S}_2{O}_3+N{a}_2{S}_4{O}_6$
$3Cu{S}_2{O}_3+2N{a}_2{S}_2{O}_3\to N{a}_4\left[C{u}_6\right(S_2{O}_3{)}_5]$
In this process 0.2 mole of sodium cuprothiosulphate is formed. (O=16, Na=23, S=32)
If instead of given amount of sodium thiosulphate, 2 moles of sodium thiosulphate along with 3 moles of $CuS{O}_4$ were taken initially. Then moles of sodium cuprothiosulphate formed is:

1. 0
2. 1
3. 1.5
4. 2