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Class 10 Chemical Reactions and Equations worksheet
CBSE Science. Balancing equations, types of reaction, oxidation and reduction, precipitates. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The reaction 4Al + 3O₂ → 2Al₂O₃ is an example of:
- a decomposition reaction
- a combination reaction
- a double displacement reaction
- a displacement reaction
Answer
(b) a combination reaction
two or more substances combine to form one product
- 2.
Which of these chemical equations is correctly balanced?
- 2AgCl → 2Ag + 2Cl₂
- 2AgCl → 3Ag + Cl₂
- 2AgCl → 2Ag + Cl₂
- 3AgCl → 2Ag + Cl₂
Answer
(c) 2AgCl → 2Ag + Cl₂
count each kind of atom on both sides
- 3.
A reaction in which heat is given out is called:
- decomposition
- endothermic
- displacement
- exothermic
Answer
(d) exothermic
Section B · short answer
- 4.
Balance the equation: Cl₂ + KBr → KCl + Br₂
Answer
Cl₂ + 2KBr → 2KCl + Br₂
make the atoms of each element equal on both sides
- 5.
How many atoms of oxygen are there in 4C₁₂H₂₂O₁₁?
Answer
44
11 in one unit × 4
Section C · long answer
- 6.
A shiny brown element X turns black when heated in air. Name X and the black compound, and write the balanced equation.
Answer
X is copper and the black compound is copper(II) oxide: 2Cu + O₂ → 2CuO.
Fresh sheets for your child
In the app, every Chemical Reactions and Equations sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.