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Questions and Answers
The reaction H2 + Cl2 -> 2HCl represents which type of reaction?
The reaction H2 + Cl2 -> 2HCl represents which type of reaction?
What is the color of the solution obtained when crystals of copper sulphate are dissolved in water?
What is the color of the solution obtained when crystals of copper sulphate are dissolved in water?
When dilute HCl is added to zinc pieces in a test tube, what happens?
When dilute HCl is added to zinc pieces in a test tube, what happens?
How many molecules of ozone (O3) are required for every one molecule of PbS in the reaction where PbS reacts with ozone and forms PbSO4?
How many molecules of ozone (O3) are required for every one molecule of PbS in the reaction where PbS reacts with ozone and forms PbSO4?
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What is chemically rust?
What is chemically rust?
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Which of the following reactions is not correct?
Which of the following reactions is not correct?
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Study Notes
Chemical Reactions
- The reaction H2 + Cl2 → 2HCl is a combination reaction, where two or more reactants combine to form a single product.
Copper Sulphate in Water
- Dissolving crystals of copper sulphate (CuSO4) in water produces a blue solution, indicating the presence of hydrated copper ions.
Reaction of HCl with Zinc
- When dilute hydrochloric acid (HCl) is added to zinc (Zn) pieces, hydrogen gas (H2) is produced, resulting in fizzing or bubbling as the gas escapes.
Ozone and Lead Sulfide Reaction
- In the reaction where lead sulfide (PbS) reacts with ozone (O3) to form lead sulfate (PbSO4), three molecules of ozone are required for every one molecule of PbS.
Rust Definition
- Rust is chemically identified as hydrated iron(III) oxide, commonly represented as Fe2O3•nH2O, formed when iron reacts with oxygen and moisture.
Reaction Accuracy
- Evaluating given reactions is essential; only correct reactions, where reactants yield appropriate products, are valid in chemical equations.
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Description
Test your knowledge of chemical reactions and equations with these important one-mark questions from CBSE Class 10 Science. From identifying the color of solutions to understanding the reactions of zinc with dilute HCl, this quiz covers key concepts from the chapter.
