Amphoteric Metals Reaction

Q.

Amphoteric oxide + Alkali $\to$

1. Analysis

2. Precipitation

3. Reagent

4. None of these

Q.

The product(s) formed in the following reaction is/are

$Zn+2KOH(hotconc.)\to$ ______

1. $Zn{O}_2+H_2+2K$

2. $K_{2}Zn{O}_2+H_{2}O$

3. $K_{2}Zn{O}_2$

4. $K_{2}Zn{O}_2+H_2$

Q.

Which gas is formed when an amphoteric metal reacts with a strong base?

1. $O_{2\left(g\right)}$

2. $H_2{O}_{\left(g\right)}$

3. $H_{2\left(g\right)}$

4. $C{O}_{\left(g\right)}$

Q.

Which of the following is amphoteric in nature?

1. Zinc hydroxide

2. Lead oxide

3. Aluminium oxide

4. All of the above

Q.

What happens when zinc react with hot and concentrated KOH?

1. Water is formed along with corresponding soluble salt

2. Hydrogen gas is liberated.

3. Corresponding insoluble salt is formed

4. Oxygen gas is liberated

Q.

The precipitate formed due to the reaction of ammonium hydroxide and copper sulphate is ___ and is ___ in colour

1. cuprous hydroxide, red

2. cupric hydroxide, pale blue

3. ammonium sulphate, green

4. ammonium sulphate, yellow

Q.

What is the yellow coloured amphoteric oxide that reacts with caustic soda to give a colourless salt of sodium plumbate and water?

1. Sodium oxide

2. Potassium oxide

3. Zinc oxide

4. Lead oxide

Q.

Choose the correct chemical equation showing the reaction of lead with potassium hydroxide

1. $Pb+2KOH\to K_{2}PbO+H_2$

2. $Pb+2KOH\to K_{2}Pb{O}_2+H_2$

3. $Pb+2KOH\to K_{2}Pb{O}_2+2H_{2}O$

4. $Pb+2KOH\to K_{2}Pb{O}_2+H_2$

Q.

Hot concentrated ___ must be added to aluminium hydroxide to obtain potassium aluminate.

Q.

Zinc oxide reacts with 'y' to give sodium zincate and water. Then 'y' is:

1. Sodium sulphate

2. Sodium hydroxide

3. Sodium hydride

4. Sodium chloride