Master Class 10 Science: Top PYQs &MCQs from Chapter 1 You Can't Miss!

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Question 1: Which of the following is a type of a chemical reaction?

A) Physical reaction

B) Combination reaction

C) Mechanical reaction

D) None of the above

Question 2:Which of the following is a correct example of a decomposition reaction?:

A) 2H₂ + O₂ → 2H₂O

B) CaCO₃ → CaO + CO₂

C) NaCl → Na + Cl₂

D) N₂ + 3H₂ → 2NH₃

Question 3: Which of the following is not a physical change?

A) Boiling water

B) Melting ice

C) Burning of coal

D) Dissolving salt in water

Question 4: What type of reaction is represented by the equation: 2NaCl + H₂SO₄ → Na₂SO₄ + 2HCl

A) Combination reaction

B) Decomposition reaction

C) Displacement reaction

D) Double displacement reaction

Question 5: What is the name of the product formed when magnesium reacts with oxygen?

A) Magnesium oxide

B) Magnesium hydroxide

C) Magnesium peroxide

D) Magnesium nitrate

Question 6: Which of the following reactions is an example of a redox reaction?

A) Na + Cl₂ → NaCl

B) H₂ + O₂ → H₂O

C) Both a and b

D) None of the above

Question 7:Which of the following is the correct balanced equation for the reaction between zinc and hydrochloric acid?

A) Zn + 2HCl → ZnCl₂ + H₂

B Zn + 2H₂O → Zn(OH)₂ + H₂

C) Zn + HCl → ZnCl₂ + H₂

D) Zn + 2H₂O → ZnCl₂ + H₂

Question 8: What happens when an acid reacts with a base?

A) Formation of a salt and water

B) Formation of only salt

C) Formation of only water

D) No reaction

Question 9: Which gas is produced when an acid reacts with a metal?

A) Carbon dioxide

B) Oxygen

C) Hydrogen

D) Nitrogen

Question 10: What happens when a pieces of iron is exposed to moist air for a long time?

A) It melts

B) It forms iron oxide (rust)

C) It evaporates

D) It turns black

Question 11: Which of the following is a physical change?

A) Burning of wood

B) Melting of wax

C) Rusting of iron

D) Decomposition of hydrogen peroxide

Question 12: The balanced chemical equation for the reaction between iron (III) oxide and carbon monoxide is:

A) Fe₂O₃ +3CO → 2Fe + 3CO₂

B) Fe₂O₃ + CO → Fe + CO₂

C) Fe + 3CO → Fe₂O₃ + 3CO₂

D) Fe₂O₃ + 2CO → 2Fe + 2CO₂

Question 13: Which of the following gases is released when an acid reacts with a carbonate?

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen

Question 14: Which of the following is a characteristic of a chemical change?

A) No change in the composition of the substance

B) The substance changes color, temperature, or forms a new product

C) The change is reversible

D) None of the above

Question 15: Which of the following is a displacement reaction?

A) 2H₂ + O₂ → 2H₂O

B) CuSO₄ + Zn → ZnSO₄ + Cu

C) Na + Cl₂ → NaCl

D) H₂O → H₂ + O₂

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Total Questions Attempted: 0

Correct Answers: 0

Wrong Answers: 0

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