Chemical Properties of Metals (Reaction with O2, H2O, Acids)Practice Questions & MCQs
Practice Chemical Properties of Metals (Reaction with O2, H2O, Acids) questions from Metals and Non-metals (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.
Chemical Properties of Metals (Reaction with O2, H2O, Acids)Quiz - Solve & Score
Q1. What is the direction of the reaction in a word-equation?
- A.The arrowhead points towards the reactants
- B.The arrowhead points towards the products
- C.The arrowhead points in both directions
- D.There is no arrowhead
Answer: B. The arrowhead points towards the products
Going back to the NCERT chapter, The arrowhead points towards the products, showing the direction of the reaction. That fits the listed correct option directly - This shows the direction of the reaction. Quickly on the wrong ones: option A) 'The arrowhead points towards the reactants' fails since The arrowhead points towards the products; option C) 'The arrowhead points in both directions' is wrong because The arrowhead points in one direction, towards the products. Hence the answer is B) The arrowhead points towards the products.
Q2. Which equation correctly represents the reaction of Plaster of Paris with water (setting into a hard mass)?
- A.CaSO4·½H2O + 1½H2O → CaSO4·2H2O
- B.CaSO4·½H2O + ½H2O → CaSO4·2H2O
- C.CaSO4·2H2O → CaSO4·½H2O + 1½H2O
- D.CaSO4·½H2O → CaSO4 + ½H2O
Answer: A. CaSO4·½H2O + 1½H2O → CaSO4·2H2O
Q3. Which of the following is evidence that a chemical reaction has taken place?
- A.A change in colour, formation of a gas or precipitate, or a change in temperature
- B.Only a change in the shape of the container
- C.Only the passage of time
- D.The substances simply being mixed together
Answer: A. A change in colour, formation of a gas or precipitate, or a change in temperature
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