Laboratory Method of Preparation

Q.

Sodium reacts with water to give sodium hydroxide and hydrogen. Write a balanced chemical equation for this reaction.

Q.

Write the balanced chemical equations for the following reactions.

(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

Q.

Describe how water reacts with Carbon dioxide state experimental conditions and write the balanced chemical equation.

Q.

Complete the reaction: $\mathrm{PbO}+2\mathrm{NaOH}\to$?

Q.

Write balanced chemical equation of action of dilute sulfuric acid on sodium sulfite?

Q.

$C{H}_4+C{l}_2\to C{H}_{3}Cl+HCl$ reaction is an example of -

1. Synthetic

2. Analytical

3. Displacement

4. Neutralization

Q.

How would you distinguish between ${\mathrm{Zn}}^{2+}$ and ${\mathrm{Pb}}^{2+}$ using ammonium hydroxide solution?

Q.

Give balanced chemical equations for each of the following:
(i) Lab preparation of ammonia using an ammonium salt.
(ii) Reaction of ammonia with excess chlorine.
(iii) Reaction of ammonia with sulphuric acid.

Q.

Write the reaction of chlorine with ethyne

(i) in the presence of light

Q.

1.nitrogen reacts with hydrogen to give ammonia.Calculate the volume of the ammonia gas formed when nitrogen reacts with 6 liters of hydrogen.All gases measures at s.t.p , using Gay lussacs law , with step by step process

Q.

State your observation for the following case:
Ammonia gas is burnt in an atmosphere of oxygen in the absence of a catalyst.

Q.

What happens when aluminium nitride reacts with water

1. Ammonia gas is released

2. Metal hydroxide is obtained

3. Aluminium nitrate is formed

4. Aluminium nitrite is formed

Q. Convert :
(a) Methane into chloroform.

Q. Write an equation for the reactions of hydrochloric acid on :​ (d) zinc carbonate

Q.

Why can't we use Concentrated $H_{2}S{O}_4$ for drying ammonia?

1. Since $N{H}_3$ and $H_{2}S{O}_4$ are base, no reaction occurs.

2. None of the above

3. Since $N{H}_3$ and $H_{2}S{O}_4$ are acidic no reaction occurs.

4. Since $N{H}_3$ is a base and $H_{2}S{O}_4$ is an acid, together they will form a salt.

Q.

Write the balanced chemical equations for the following reactions

Magnesium nitride reacts with water to produce magnesium hydroxide and ammonia.

Q.

Ammonia can be obtained by adding water to-

1. (a) Ammonium chloride

2. (b) Ammonium nitrite

3. (C) Magnesium nitride

4. (d) Magnesium nitrate

Q.

Write the balanced chemical equations for the following reactions

Sulphur trioxide reacts with water to give sulphuric acid

Q.

Name two crystalline substances which do not contain water of crystallisation

Q.

Nitric acid turns a paper soaked in Potassium iodide solution brown due to liberation of:

1. Iodine

2. Nitrogen dioxide

3. Copper

4. Hydrogen iodide

Q.

Salts are compounds formed by the combination of an acid and a __________.

Q.

The following questions are based on the preparation of ammonia gas in the laboratory:
(a) Explain why ammonium nitrate is not used in the preparation of ammonia.
(b) Name the compound normally used as a drying agent during the process.
(c) How is ammonia gas collected?
(d) Explain why it is not collected over water.

Q.

Identify the acid which matches the following description:
The acid on mixing with lead nitrate solution produces a white precipitate which is insoluble even on heating.

Q.

(a) Describe one experiment to show that concentrated Sulphuric acid can remove hydrogen and oxygen in the ratio of 2:1 to form water.

(b) Describe two reactions in which Sulphuric acid behaves as an acid.

Q.

Oxygen is collected by the downward displacement of water.

1. True
2. False

Q.

How is ammonia gas collected in the process of preparation of ammonia gas?

Q.

A student added concentrated Sulphuric acid to a substance and noted that a colourless gas was given off, which decolourised bromine water. He concluded that Sulphur dioxide had been produced by the reduction of Sulphuric acid.

(a) He may have been wrong in his first conclusion. Why?

(b) Name one substance which would produce Sulphur dioxide when acted upon by concentrated Sulphuric acid without involving the reduction of Sulphuric acid. Write a balanced equation for the reaction and use it to show that reduction of acid has not occurred.

Q.

Concentrated nitric acid oxidizes phosphorus to phosphoric acid according to the following equation:

$\mathrm{P}+5{\mathrm{HNO}}_3\left(\mathrm{conc}.\right)\to {\mathrm{H}}_3{\mathrm{PO}}_4+{\mathrm{H}}_2\mathrm{O}+5{\mathrm{NO}}_2$

If $9.3\mathrm{g}$ of phosphorus was used in the reaction, calculate:

(b) The mass of phosphoric acid formed? $\left[\mathrm{H}=1,\mathrm{N}=14,\mathrm{P}=31,\mathrm{O}=16\right]$

Q. Under what conditions does ethane get converted to :
(b) Acetaldehyde

Q. Which chemist synthesized the organic compound ‘urea’ from simple inorganic compounds for the first time?

1. Wohler
2. Lavoiser
3. Fuller
4. Haber