State one relevant reason for the following: Concentrated nitric acid appears yellow when it is left for a while in a glass bottle.

Concentrated nitric acid is a colourless liquid but is thermally unstable. With a little heat the acid dissociates into reddish-brown nitrogen dioxide gas that dissolves in the acid and turns the acid yellow.

Write a balanced chemical equation for the following: The reaction of carbon powder and concentrated nitric acid.

Carbon gets oxidised when it reacts with concentrated nitric acid and liberates reddish-brown fumes of nitrogen dioxide. The balanced chemical reaction is as follows: C + 4 HNO 3 → CO 2 + 4 NO 2 + 2 H 2 O

A substance when dissolve in water gives hydrogen ion H + on dissociation is called an acid. It can also be defined as the substance that donate protons to the another substance. They are sour in the taste and turns blue litmus to red. The acids obtained from plants or animals are called organic acids. Examples: Citric acid, tartaric acid, etc. The acids obtained from minerals are called mineral acids or inorganic acids. Examples: Sulphuric acid, hydrochloric acid, etc.

Choose from the following list of substances, the one substance, that matches the description given below: Sulphur dioxide Chlorine Hydrogen sulphide Methane Sodium hydrogen sulphate Methanol The gas turns moist lead acetate paper black.

H 2 S turns moist lead acetate paper black. The black colour is due to the formation of lead sulphide. Hydrogen sulphide is a flammable, colourless gas with a characteristic odour of rotten eggs. Hydrogen sulphide is a weak acid and lead acetate is basic in nature. This is a simple acid-base reaction. H 2 S + ( CH 3 COO ) 2 Pb → PbS + 2 CH 3 COOH Black

EASY

Earn 100

Name the gas that was released during the limestone reaction with acids.

Important Questions on Acids and Bases

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

The exact volumes of

1 M NaOH

solution required to neutralise

50 mL

1 M H_{3} {PO}_{3}

solution and

100 mL

2 M H_{3} {PO}_{2}

solution, respectively, are :

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

State one relevant reason for the following:

Concentrated nitric acid appears yellow when it is left for a while in a glass bottle.

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Write a balanced chemical equation for the following:

The reaction of carbon powder and concentrated nitric acid.

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

What happens when baking soda is treated with vinegar? Give chemical equation.

EASY

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Write the quadrants in which the following points lie:

$(- 4, 7)$

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Write an activity to show a chemical change.

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Describe an activity to show that mixing of vinegar and baking powder is a chemical change.

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of gas. What type of change is it? Explain.

EASY

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Identify the following substance which is underlined.
An acid which is present in vinegar.

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Nitric acid, when prepared, is usually a yellow liquid. Why is it so?

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

When baking soda reacts with vinegar, the gas evolved is

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Bubbles are produced when acetic acid is added to sodium bicarbonate. Explain.

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Choose from the following list of substances one substance which matches the description given below:
Aluminium nitride, copper, lead chloride, fluorine, methanol, ethyne, sulphur, zinc, concentrated sulphuric acid, acetic acid, chlorine, methane and phosphorus.
An aqueous solution of this substance contains both ions and molecules.

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Give reason for the following:

(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Explain the acid.

MEDIUM

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases

Give a balanced chemical equation for the following:
Action of concentrated nitric acid on sulphur.

HARD

Chemistry>Inorganic Chemistry>Acids and Bases>Properties of Acids and Bases