Metal Oxide and Hydroxide

Q.

Given below are two statements:

Statement I: Both ${\mathrm{CaCl}}_2.6{\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{MgCl}}_2.8{\mathrm{H}}_2\mathrm{O}$ undergo dehydration on heating.

Statement II: $\mathrm{BeO}$ is amphoteric whereas the oxides of other elements in the same group are acidic.

1. Statement I is true but statement II is false

2. Both Statement I and Statement II are false

3. Statement I is false but statement II is true

4. Both Statement I and Statement II are true

Q.

Which of the following is the weakest base?

1. $\mathrm{NaOH}$

2. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

3. ${\mathrm{NH}}_4\mathrm{OH}$

4. $\mathrm{KOH}$

Q.

The nature of the precipitate formed when sodium hydroxide reacts with iron (II) sulphate is of

1. iron (III) hydroxide which is dirty green in colour and insoluble in excess of NaOH.

2. iron (II) hydroxide which is dirty green in colour and insoluble in excess of NaOH.

3. sodium sulphate which is yellow in colour and soluble in excess of NaOH.

4. sodium sulphate which is dirty green in colour and soluble in excess of NaOH.

Q.

Identify the hydroxide which is soluble in excess of NaOH

1. $Fe(OH{)}_3$

2. $Fe(OH{)}_2$

3. $Zn(OH{)}_2$

4. $Mg(OH{)}_2$

Q.

When lead nitrate reacts with ammonium hydroxide, a chalky white precipitate is formed. The precipitate formed is insoluble in excess of ammonium hydroxide. Name this precipitate.

1. Lead hydroxide

2. Ammonium nitrate

3. Ammonium oxide

4. Lead oxide

Q.

Which bases are called alkalis, give an example of alkali?

Q.

Is calcium hydroxide a weak alkali?

Q. Name the method used for preparation of the following salts from the list given below:
(i) Sodium nitrate
(ii) Iron (III) chloride
(iii) Lead chloride
(iv) Zinc sulphate
(v) Sodium hydrogen sulphate.
List:
(a) Simple displacement
(b) Neutralization
(c) Decomposition by acid
(d) Double decomposition
(e) Direct synthesis

Q.

Sodium hydroxide and ammonium hydroxide are soluble in water. Write the chemical equation of:-

Ammonium hydroxide with hydrochloric acid

Q.

A compound X on electrolysis in aqueous solution produces a strong base. Y along with two gases A and B . B is used in manufacture of bleaching powder. Identify X, Y, Aand B . Write chemical equations

Q.

What is the colour of Copper carbonate?

Q.

Formation of Nh4Cl from NH3 and HCl is a synthesis reaction.comment on the statement.

Q.

Give two examples of bases which are not alkali.

Q.

What happens when calcium nitrate reacts with ammonium hydroxide?

1. A white precipitate of calcium hydroxide is formed.

2. A white precipitate of calcium oxide is formed.

3. Hydrogen gas is liberated.

4. A turbid solution is formed.

Q. What is the colour of BaCrO₄

Q.

Write balanced equations for the following conversions
(a) $ZnS{O}_4\stackrel{A}{⟶}Zn(OH{)}_2\stackrel{B}{⟶}$
(b) $CuS{O}_4\stackrel{A}{⟶}Cu\left(OH{)}_2\stackrel{B}{⟶}\right[Cu\left(N{H}_3\right)4]S{O}_4$

Q.

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

1. Zinc Chloride

2. Ferrous chloride

3. Ferric chloride

4. Copper chloride

Q.

Sodium hydroxide solution can be used to distinguish between iron(II) sulphate solution and iron (III) sulphate solution because these solutions give different coloured precipitates with sodium hydroxide precipitate. Give the colour of precipitate formed with

1. Iron(II) sulphate solutoion
2. Iron(III) sulphate solution

Q.

What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
(a) $FeC{l}_3$,

(b) $ZnS{O}_4$,
(c) $Pb(N{O}_3{)}_2$,

(d) $CuS{O}_4$ ?
Write balanced equations for these reactions.

Q.

Name a salt which is insoluble in cold water and soluble in hot water.

Q.

Hot concentrated sodium hydroxide reacts with lead hydroxide to produce lead oxide, sodium oxide and water.

1. True

2. False

Q. Do calcium salts react with aqueous ammonia?

Q.

The precipitate of zinc hydroxide formed during a reaction does not dissolve in excess of ammonium hydroxide.

1. True

2. False

Q.

Aluminium oxide reacts with potassium hydroxide to form white salt and water. What is the nature of aluminium oxide?

1. Acidic in nature

2. Basic in nature

3. Amphoteric in nature

4. None of these

Q.

Ammonium hydroxide added to magnesium chloride gives _____ and the precipitate so formed is of _____.

1. magnesium oxide, ammonium chloride

2. ammonium chloride, magnesium hydroxide

3. ammonium chloride, magnesium oxide

4. magnesium hydroxide, ammonium chloride

Q.

What do you mean by the term decrepitation?

Q.

How aluminium amphoteric reaction is formed ???

With hcl and naoh

Q.

Sodium hydroxide is _______.

Q. Name a chloride which is soluble in excess of ammonium hydroxide.

Q.

Name a gas which dissolves in water to give alkaline solution.