Writing and Balancing Chemical EquationsPractice Questions & MCQs
Practice Writing and Balancing Chemical Equations questions from Chemical Reactions and Equations (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Writing and Balancing Chemical EquationsQuiz - Solve & Score
Q1. How many oxygen atoms are present on each side of 2KClO3 -> 2KCl + 3O2?
- A.6
- B.3
- C.9
- D.2
Answer: A. 6
Given: 2; 3; 2; 3; 2. Required: How many oxygen atoms are present on each side of 2KClO3 -> 2KCl + 3O2?. Key equation - Left: 2 x 3 = 6 O. This is the equation that links the given quantities to the unknown (chemistry, chapter 'Chemical Reactions and Equations'). Carrying out the arithmetic: Left: 2 x 3 = 6 O → Right: 3 x 2 = 6 O. Hence the answer is A) 6. Ruling out the other options: option B) '3' doesn't hold - 2KClO3 has 6 O; 3O2 also has 6; option C) '9' fails since Both sides contain 6 oxygen atoms; option D) '2' is incorrect: Each side has 6 oxygen atoms.
Q2. Which of the following is a balanced equation (NCERT)?
- A.2H2 + N2 -> 2NH3
- B.3H2 + N2 -> 2NH3
- C.H2 + N2 -> 2NH3
- D.H2 + N2 -> NH3
Answer: B. 3H2 + N2 -> 2NH3
Asked for the unknown; data is laid out in the stem. By so the answer = 3H2 + N2 -> 2NH3. so the answer = 3H2 + N2 -> 2NH3. a balanced equation must have equal atoms of every element on both sides and equal total charge. Thus option B) 3H2 + N2 -> 2NH3. Others fail: option A) '2H2 + N2 -> 2NH3' doesn't hold - Hydrogen is not balanced (need 3H2); option C) 'H2 + N2 -> 2NH3' doesn't hold - Both H and N are unbalanced.
Q3. Which equation is correctly balanced?
- A.Al + 6HCl -> 2AlCl3 + 3H2
- B.2Al + 6HCl -> 2AlCl3 + 3H2
- C.2Al + 3HCl -> 2AlCl3 + 3H2
- D.Al + HCl -> AlCl3 + H2
Answer: B. 2Al + 6HCl -> 2AlCl3 + 3H2
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