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Class 10 Science Chapter 1 Chemical Reactions and Equations Quiz

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Class 10 Science Chapter 1 Chemical Reactions and Equations Quiz

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Questions and Answers

In the given reaction, what does 'x', 'y', and 'z' represent?

x = number of moles of KClO3; y = reaction condition; z = number of molecules of oxygen (correct)

x = solid; y = liquid; z = gas

x = gas; y = reaction condition; z = gas

x = physical state of KClO3 and KCl; y = reaction condition, z = physical state of O2

Identify the accuracy of the assertion and reason provided for the action of steam on iron.

(A) is false, but (R) is true

Both (A) and (R) are true, but reason (R) is not the correct explanation of the assertion (A)

Both (A) and (R) are true and reason (R) is the correct explanation of the assertion (A) (correct)

(A) is true, but (R) is false

What law must be followed when balancing a chemical equation?

The law of definite proportions

The law of conservation of mass (correct)

The law of conservation of momentum

The law of conservation of energy

Study Notes

Understanding Chemical Reactions

In a chemical reaction, 'x', 'y', and 'z' represent the stoichiometric coefficients, which are used to balance the equation and indicate the relative amounts of reactants and products.

Analyzing the Action of Steam on Iron

The assertion states that steam reacts with iron to form iron oxide and hydrogen gas.
The accuracy of this assertion is true, as steam can react with iron at high temperatures, resulting in the formation of iron oxide (rust) and hydrogen gas.

Balancing Chemical Equations

When balancing a chemical equation, the law of conservation of mass must be followed, which states that matter cannot be created or destroyed in a chemical reaction.
This means that the number of atoms of each element must be the same on both the reactant and product sides of the equation.

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Description

Test your understanding of important concepts in Class 10 Science Chapter 1: Chemical Reactions and Equations. Practice solving different types of questions, including previous year questions, to prepare for the board examination.