Zinc Ion

Q.

A white amphoteric oxide reacts with sodium hydroxide to give sodium zincate and water. Name this amphoteric oxide.

1. Zinc oxide

2. Lead oxide

3. Sodium oxide

4. Potassium hydroxide

Q.

What is the colour of sodium sulphate formed due to the reaction of zinc sulphate with sodium hydroxide?

1. Green

2. Pink

3. Blue

4. Colourless

Q.

When zinc react with hot and concentrated NaOH, a colourless salt is formed. Name this colourless salt.

1. Sodium meta aluminate

2. Sodium zincate

3. Zinc hydroxide

4. Zinc oxide

Q.

To which of the following salts, sodium hydroxide when added gives a precipitate?

1. Zinc Nitrate

2. Zinc Chloride

3. Zinc Sulphate

4. All of the above

Q.

A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.

1. Calcium

2. Magnesium

3. Zinc

4. Iron

Q.

Name the products formed when a small amount of KOH solution is added to the $ZnS{O}_4$ solution.

1. Sodium zincate and water

2. Zinc hydroxide and sodium sulphate

3. Sodium zincate and sodium suphate

4. Zinc hydroxide and water

Q.

The reaction of zinc with hot concentrated caustic alkalis involve the liberation of

1. hydrogen chloride gas.

2. carbon dioxide gas.

3. hydrogen gas.

4. oxygen gas.

Q.

Ammonium hydroxide solution can be used to distinguish between zinc ion and calcium ion.

1. True

2. False

Q.

The products formed when an excess of NaOH solution is added to $ZnS{O}_4$ solution are ____ and ____.

1. sodium zincate, water

2. Zinc, water

3. Sodium oxide, zinc

4. Sodium sulphate, zinc oxide

Q. Complete the following reactions:
${\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+2\mathrm{NaOH}\left(\mathrm{aq}\right)\to$ $+\mathrm{Zn}\left(\mathrm{OH}{)}_2\right(\mathrm{ppt}.)$
${\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+2{\mathrm{NH}}_4\mathrm{OH}\left(\mathrm{aq}\right)\to \left({\mathrm{NH}}_4{)}_2{\mathrm{SO}}_4\right(\mathrm{aq})$ +

1. $N{a}_{2}S{O}_4$ (aq)
2. $NaS{O}_4$(aq)
3. $Zn(OH{)}_2$ (ppt.)
4. $ZnO$(ppt.)