Reaction of Metallic Oxides and Hydroxides with Acids

Q.

What is the reaction when aluminum oxide reacts with sodium hydroxide?

Q.

(a) Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction.

(b) Balance the following chemical equation.

$Mn{O}_2$ + HCl $⟶$ $MnC{l}_2$ + $C{l}_2$ + $H_{2}O$

Q.

Explain why the reactivity of $\mathrm{Al}$ decreases if it is dipped in ${\mathrm{HNO}}_3$.

Q.

Explain the statement metal oxides are basic in nature

Q.

What do you mean by amphoteric oxide??

Q. The products obtained when very dilute nitric acid (${\text{HNO}}_3$) reacts with magnesium are and hydrogen gas.

1. magnesium nitrate
2. magnesium oxide
3. magnesium hydroxide
4. magnesium nitride

Q.

An ore after levigation is found to have basic impurities. which of the following can be used as flux during smelting?

1. (a) ${\mathrm{H}}_2{\mathrm{SO}}_4$

2. (b) ${\mathrm{CaCO}}_3$

3. (c) ${\mathrm{SiO}}_2$

4. (d) Both $\mathrm{CaO}\mathrm{and}{\mathrm{SiO}}_2$

Q.

Cold, dilute nitric acid react with copper to form………..

Q. When metal oxides react with ___, they form salt and water.

1. acids
2. bases
3. water
4. metals

Q.

Name
(a) a black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases, which when mixed produce a white solid.
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved.
(f) the experiment which demonstrates that hydrogen chloride is soluble in water.
(g) the gas produced when chlorine water is exposed to sunlight.

Q.

Which colour change is observed when dilute $\text{HCl}$ is added to a beaker containing copper oxide?

1. Red colour
2. Blue-green colour
3. Orange colour
4. Purple colour

Q.

Al₂O₃ is an example of a neutral oxide.

1. True
2. False

Q.

Give reason for the following.

a) Zinc sulphate is called a salt.

b) SO2 is called an acidic oxide

c) Al2O3 is called a basic oxide.

Q.

Choose the correct option:

1. Non-metallic oxides are basic in nature.

2. Metallic oxides are acidic in nature.

3. Non-metallic oxides are acidic in nature.

4. Metallic oxides are neutral in nature.

Q.

Define basic anhydride.

Q.

What happens when an acid reacts with a metal oxide? Explain with the help of an example. Write a balanced equation for the reaction involved.

Q.

$Mn{O}_2,Pb{O}_2$ and red lead react with conc. HCl acid liberates $C{l}_2$. What is the common property being shown by these metal oxides ?

Q.

Take any one alkali metal and write its reaction with:

(a) Oxygen

(b) Water

(c)Acid

Q.

What will happen when metals such as Zn, Fe, Cu and Al react with nitric acid?

Q. What visible change is observed in limewater (colourless) when ${\text{CO}}_2$ gas is passed through it?

1. The solution turns blue
2. The solution turns green
3. The solution turns milky
4. No colour change

Q.

Al₂O₃, is an example of neutral oxide.

1. True
2. False

Q. What is the visible change observed when $C{O}_2$ is passed through lime water? This change is due to the formation of which compound?

1. Blue color, $CuS{O}_4$
2. Green color, $CuC{O}_3$
3. Milky, $CaC{O}_3$
4. Milky, $Ca(HC{O}_3{)}_2$

Q.

Metal oxides react with dilute acids to form salt and water.

1. False

2. True

Q. $Mn{O}_2,Pb{O}_2$ and red lead react with conc. HCI acid to liberate $C{l}_2$.
(a) What is the common property being shown by these metal oxides?
(b) Write a balanced equation for the following reaction: $P{b}_3{O}_4$ + Conc. HCI.
(c) What kind of compound can be added to bleaching powder to obtain $C{l}_2$. [5 MARKS]

Q.

Which of the following represent a double displacement reaction?

1. +

2. + ​+

3. +

4. 

Q.

A coin is analysed by dissolving it in nitric acid. To the resulting solution an excess of aqueous Ammonia is added and the mixture is filtered. A brown precipitate remains in the filter paper and a deep blue solution is obtained as the filtrate. Which metals does the coin contain?

1. Lead and Zinc

2. Copper and Iron

3. Iron and Lead

4. Aluminium and Copper

Q.

Statement 1: Metal oxides are basic in nature.

Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

1. Statement 1 is incorrect, but statement 2 is correct.

2. Both statements are correct and statement 2 is the correct reason for statement 1.

3. Statement 1 is correct, but statement 2 is incorrect.

4. Statement 1 and statement 2 are correct, but statement 2 is not the correct explanation for statement 1.

Q. What are the products formed when $\text{MgO}$ reacts with $\text{HCl}$?

1. ${\text{Mg(OH)}}_2\text{(aq)}+{\text{H}}_2\text{O}\text{(l)}+{\text{Cl}}_2\text{(g)}$
2. ${\text{MgCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$
3. ${\text{MgCl}}_2\text{(aq)}+{\text{H}}_2\text{O}\text{(l)}$
4. ${\text{MgCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}+{\text{O}}_2\text{(g)}$

Q. $CuO+X\to CuS{O}_4+H_{2}O$. Here (X) is

1. $HCl$
2. $H_{2}S{O}_4$
3. $CuS{O}_4$
4. $HN{O}_3$

Q.

Which of the following is an example of an amphoteric oxide?

1. Sulphur dioxide

2. Sodium oxide

3. Zinc oxide

4. Carbon monoxide