Q1: What is rust?
Answer: Rust is hydrated iron oxide called Ferric oxide (Fe2O3.xH2O). It is reddish brown in colour.
Q2: What is the chemical equation of Burning of magnesium in air?
Answer: Magnesium + oxygen -> Magnesium oxide
2Mg + O2 -> 2MgO
Q3: What is the nature of Magnesium oxide (MgO)?
Answer: Magnesium oxide is basic in nature.
Q4: What happens when Magnesium reacts with Oxygen?
Answer: When Magnesium reacts with Oxygen it forms Magnesium Oxide.
2Mg + O2 -> 2MgO
Q5: What is the colour of Magnesium Oxide?
Answer: White
Q6: What is the colour of magnesium?
Answer: Silvery white colour
Q7: What happens when Zinc (Zn) reacts with Dilute Sulphuric acid (H2SO4)?
Answer: When Zinc reacts with Dilute Sulphuric acid it forms Zinc Sulphate (ZnSO4) and release Hydrogen gas (H2).
Zn + H2SO4 -> ZnSO4 + H2
Q8: What happens when Zinc (Zn) reacts with Hydrochloric acid (HCl)?
Answer: When Zinc reacts with Dilute Hydrochloric acid it forms Zinc Chloride (ZnCl2) and release Hydrogen gas (H2).
Zn + HCl -> ZnCl2 + H2
Q9: What is the chemical formula of Lead Nitrate?
Answer: Pb(NO3)2
Q10: What is the chemical formula of Potassium Iodide?
Answer: KI
Q11: What happens when Lead Nitrate solution is mixed with Potassium Iodide solution?
Answer: Lead Nitrate solution reacts with Potassium Iodide solution and forms Lead Iodide and Potassium Nitrate. Lead Iodide is yellowish precipitation which is insoluble in water.
Pb(NO3)2 + KI -> PbI2 + KNO3
Q12: What is exothermic chemical reaction?
Answer: A chemical reaction in which heat is evolved is called exothermic chemical reaction.
Q13: What is endothermic chemical reaction?
Answer: A chemical reaction in which heat is required for reaction is called endothermic chemical reaction.
Q14: What is the nature of chemical reaction between Zinc and dilute hydrochloric acid?
Answer: Reaction between Zinc and dilute hydrochloric acid is exothermic in nature.
Q15: What is chemical equation?
Answer: Chemical equation is the representation of chemical reaction by the chemical formula of reactants and products.
Q16: On which side of chemical equation reactants are shown?
Answer: Left hand-side [LHS]
Q17: On which side of chemical equation products are shown?
Answer: Right hand-side [RHS]
Q18: What does meant by an arrowhead between reactants and products?
Answer: Arrowhead shows the direction of the reaction.
Q19: What are the types of chemical equation?
Answer: There are two types of chemical reaction:
- Balanced chemical reaction
- Unbalanced (Skeletal) chemical reaction
Q20: Which theory followed during a chemical reaction?
Answer: A chemical reaction follows the law of conservation of mass.
