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Chemical Reactions and Equations EXERCISES Solutions
- Q1: Which of the statements about the reaction below are incorrect? $2PbO(s) + C(s) \rightarrow 2Pb(s) + CO_2(g)$ (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced.
- Q2: The reaction is an example of a $Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe$
- Q3: What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
- Q4: What is a balanced chemical equation? Why should chemical equations be balanced?
- Q5(a): Translate the following statements into chemical equations and then balance them. (a) Hydrogen gas combines with nitrogen to form ammonia.
- Q5(b): Translate the following statements into chemical equations and then balance them. (b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.
- Q5(c): Translate the following statements into chemical equations and then balance them. (c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
- Q5(d): Translate the following statements into chemical equations and then balance them. (d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
- Q6(a): Balance the following chemical equations. (a) $HNO_3 + Ca(OH)_2 \rightarrow Ca(NO_3)_2 + H_2O$
- Q6(b): Balance the following chemical equations. (b) $NaOH + H_2SO_4 \rightarrow Na_2SO_4 + H_2O$
- Q6(c): Balance the following chemical equations. (c) $NaCl + AgNO_3 \rightarrow AgCl + NaNO_3$
- Q6(d): Balance the following chemical equations. (d) $BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + HCl$
- Q7(a): Write the balanced chemical equations for the following reactions. (a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
- Q7(b): Write the balanced chemical equations for the following reactions. (b) Zinc + Silver nitrate → Zinc nitrate + Silver
- Q7(c): Write the balanced chemical equations for the following reactions. (c) Aluminium + Copper chloride → Aluminium chloride + Copper
- Q7(d): Write the balanced chemical equations for the following reactions. (d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
- Q8(a): Write the balanced chemical equation for the following and identify the type of reaction in each case. (a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
- Q8(b): Write the balanced chemical equation for the following and identify the type of reaction in each case. (b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
- Q8(c): Write the balanced chemical equation for the following and identify the type of reaction in each case. (c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
- Q8(d): Write the balanced chemical equation for the following and identify the type of reaction in each case. (d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)
- Q9: What does one mean by exothermic and endothermic reactions? Give examples.
- Q10: Why is respiration considered an exothermic reaction? Explain.
- Q11: Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
- Q12: Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
- Q13: What is the difference between displacement and double displacement reactions? Write equations for these reactions.
- Q14: In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
- Q15: What do you mean by a precipitation reaction? Explain by giving examples.
- Q16(a): Explain the following in terms of gain or loss of oxygen with two examples each. (a) Oxidation
- Q16(b): Explain the following in terms of gain or loss of oxygen with two examples each. (b) Reduction
- Q17: A shiny brown coloured element ‘$X$’ on heating in air becomes black in colour. Name the element ‘$X$’ and the black coloured compound formed.
- Q18: Why do we apply paint on iron articles?
- Q19: Oil and fat containing food items are flushed with nitrogen. Why?
- Q20(a): Explain the following terms with one example each. (a) Corrosion
- Q20(b): Explain the following terms with one example each. (b) Rancidity
Chapters in CBSE - Class 10 Science
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