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

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.

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

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How does a metal oxide react with acid? Write the chemical equation for this.

Important Questions on Chemical Reactions

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

Write a balanced chemical equation for the following:

The reaction of carbon powder and concentrated nitric acid.

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions 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.

MEDIUM

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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

EASY

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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

EASY

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

Write the quadrants in which the following points lie:

$(- 4, 7)$

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

Write an activity to show a chemical change.

MEDIUM

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions 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.

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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

MEDIUM

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

When baking soda reacts with vinegar, the gas evolved is

MEDIUM

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

In the reaction between vinegar and baking soda, the gas evolved is:

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions 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

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions 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

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

Explain the acid.

HARD

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

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.

MEDIUM

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

Give reason for the following:

Baking soda fizzes with vinegar.

EASY

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

C O_{2}

is given off by chemicals like

MEDIUM

Physical and Earth Science>Change>Chemical Reactions>Chemical Reactions of Acids and Bases

Which gas is evolved in the reaction between baking soda and vinegar? What happens when this gas is passed through the lime water? Write the relevant word equations for these chemical reactions.

How does a metal oxide react with acid? Write the chemical equation for this.

Important Questions on Chemical Reactions

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