Amphoteric Metals Reaction

Q. 2NaOH + Zn gives you Na2ZnO2 + h2. Why??

Q.

Give the balanced equations for reactions of aqueous ammonia with the following:

Iron(III) chloride

Q.

Name :

(a) a metallic hydroxide soluble in excess of $N{H}_{4}OH$.
(b) a metallic oxide soluble in excess of caustic soda solution. (c) a strong alkali.
(d) a weak alkali.
(e) two colourless metal ions.
(f) two coloured metal ions.
(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(h) two bases which are not alkalis but dissolve in strong alkalis. (i) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
(j) a colourless cation, not a representative element.

Q.

What happens when aluminium reacts with boiling dil. NaOH?

1. Aluminium hydroxide and water is formed.

2. Sodium meta aluminate and water is formed.

3. Sodium meta aluminate and hydrogen is formed.

4. Aluminium hydroxide and hydrogen is formed.

Q.

What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.

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.

Name a yellow monoxide that dissolves in hot and concentrated caustic alkali.

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 aluminium reacts with boiling dil. KOH?

1. Potassium meta aluminate and water is formed.

2. Potassium meta aluminate and hydrogen is formed.

3. Aluminium hydroxide and hydrogen is formed.

4. Aluminium hydroxide and water is formed.

Q. Question 5.3
Translate the following statement into chemical equation and then balance it:

Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

Q.

$FeS{O}_4$ reacts with ammonium hydroxide to give dirty green 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 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.

What happens when sodium meta aluminate is diluted with water?

1. Impure aluminium ore is obtained.

2. A precipitate of aluminium hydroxide is obtained.

3. Aluminium oxide is formed.

4. Pure alumina is obtained.

Q.

Name :

(a) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(c) a compound containing zinc in the anion.

Q.

(a) Write happens when calcium reacts with water? Write the chemical equation of the reaction of calcium.
(b) Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?

Q.

What happens when zinc react with hot and concentrated KOH?

1. Oxygen gas is liberated

2. Corresponding insoluble salt is formed

3. Hydrogen gas is liberated.

4. Water is formed along with corresponding soluble salt

Q.

Write the balanced equation for the following reaction:

Iron(II) chloride solution with sodium hydroxide solution.

Q.

Is tin acidic or basic in nature?

Q. Correct the following statements:
(a) Copper reacts with nitric acid to produce nitrogen dioxide.
(b) Haematite is the chief ore of aluminium.

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.

A group 14 element that evolves hydrogen gas when treated with sodium hydroxide solution is:

1. Lead

2. Aluminium

3. Zinc

4. Calcium

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.

Amphoteric oxide + Alkali $\to$

1. Analysis

2. Precipitation

3. Reagent

4. None of these

Q.

Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis.

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

Q. When sodium hydroxide solution is added to copper sulfate solution, a blue precipitate of copper hydroxide is formed along with sodium sulfate solution. What kind of chemical reaction takes place between them?

1. Chemical combination reaction
2. Chemical double decomposition reaction
3. Chemical decomposition reaction
4. Chemical displacement reaction

Q.

A yellow coloured amphoteric oxide X react with caustic soda to give a colourless salt of sodium plumbate and water. What is X?

1. Potassium oxide

2. Lead oxide

3. Zinc oxide

4. Sodium oxide

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. A reaction between lead and concentrated potassium hydroxide liberates a gas that burns with a characteristic pop-up sound. Identify that gas from the given options.

1. $H_{2}O$(g)
2. $H_2$(g)
3. $O_2$(g)
4. $C{O}_2$(g)