Chemical Properties

Q.

How do you write a balanced chemical equation for the reaction of magnesium solid with sulfuric acid to form hydrogen gas and magnesium sulfate?

Q.

A solution reacts with crushed egg shells to give a gas that turns lime water milky.The solution contains:

1. NaCl

2. HCl

3. LiCl

4. KCl

Q.

How can we identify strong acid and strong base?

Q.

What happens when dilute hydrochloric acid reacts with crushed egg shells?

Q.

What happens when Ethanol reacts with Acidified Potassium Dichromate?

Q.

In the given experiment, on heating lead nitrate powder in a boiling test tube, we observe brown fumes. The emission of brown coloured fumes is due to formation of:

1. Nitrogen Oxide

2. Nitrogen Dioxide

3. Lead Oxide

4. Lead Nitrate

Q. Complete the following equations:
$C_2{H}_5\mathrm{OH}\stackrel{\mathrm{Conc}.H_2{\mathrm{SO}}_4}{\to }$ + $H_{2}O$

1. $C_2{H}_4$
2. ${\mathrm{CH}}_4$
3. ${\mathrm{CO}}_2$

Q. The blue coloured copper sulphate crystals turn white when treated with sulphuric acid. This is due to the nature of the acid.

1. dehydrating
2. oxidising
3. reducing
4. colour changing

Q.

How many chain isomers does a compound having molecular formula ${\text{C}}_5{\text{H}}_{10}$ has?

1. 5
2. 4
3. 3
4. 2

Q.

Write balanced equation of copper oxide and dilute hydrochloric acid?

Q.

Write a chemical equation of the reaction of ethanoic acid with sodium carbonate.

Q.

Explain clearly how conc. $H_{2}S{O}_4$ is used as dehydrating as well as drying agent.

Q.

The reaction of ethanol with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ does not give

1. Ethene

2. Diethyl ether

3. Ethyl hydrogen sulphate

4. Acetylene

Q.

Write the balanced chemical equation for the following:

Action of concentrated Sulphuric acid on Carbon.

Q. Distilled water is a conductor of electricity.

1. good
2. poor
3. moderate

Q. Dilute HCl acid is stronger than highly concentrated acetic acid. Why?

Q.

What will you obtain on reaction of calcium carbonate with dilute sulphuric acid?

1. Calcium sulphate, water and carbon dioxide

2. Calcium sulphate, sulphur dioxide and carbon dioxide

3. Calcium hydroxide, water and sulphur dioxide

4. Calcium sulphate, water and sulphur dioxide

Q.

Name two antioxidants which are usually added to fat and oil containing foods to prevent rancidity.

Q.

Gas A, which is the major cause of global warming, combines with hydrogen oxide B in nature in the precence of an environmental factor C and a green material D to form a six carbon organic compound E and a gas F. The gas F in necessary for breathing.

(a) What is gas A ?

(b) What is the common name of B ?

(c) What do you think could be C ?

(d) What is material D ? Where is it found ?

(e) Name the organic compound E.

(f) What is gas F ? Name the natural process during which it is released.

Q.

Conc. sulphuric acid oxidises phosphorus to

1. Phosphorous pentaoxide

2. Phosphorus trioxide

3. Phosphorous acid

4. Phosphoric acid

Q.

Write the balanced chemical equation for the following:

Oxidation of Carbon with concentrated Nitric acid.

Q. The reaction of sulphur and oxygen produce ____ gas.

1. hydrogen
2. carbon dioxide
3. sulphur dioxide
4. nitrous oxide

Q.

Which of the following drying agent is used in drying hydrogen chloride gas?

1. CaO

2. P₂O₅

3. Conc. H₂SO₄

4. CaCl₂

Q.

Benzene is an unsaturated hydrocarbon.

1. True

2. False

Q.

The decreasing order of acidity of the following phenol derivatives is

1. $\mathrm{P}>\mathrm{Q}>\mathrm{R}>\mathrm{S}$

2. $\mathrm{S}>\mathrm{R}>\mathrm{P}>\mathrm{Q}$

3. $\mathrm{S}>\mathrm{R}>\mathrm{Q}>\mathrm{P}$

4. $\mathrm{Q}>\mathrm{S}>\mathrm{R}>\mathrm{P}$

Q. Write the equations for the action of heat on ammonium chloride and ammonium nitrate.

Q.

Chlorine reacts with saturated hydrocarbons at room temperature in the

1. Absence of sunlight

2. Presence of sunlight

3. Presence of water

4. Presence of hydrochloric acid

Q.

bleaching action of so2 is due to

Q.

Give the balanced equation for the following reaction:

Sodium Chloride from Sodium Carbonate solution and dilute hydrochloric acid.

Q.

Name the catalyst which is used in the preparation of acetic acid from ethanol.