SolveItClass 10 · NCERT

NCERT Solutions · Class 10 Science Chemical Reactions and Equations

20 questions · 20 still being checked

EXERCISES 1–10 (part 1 of 2)

  1. Exercise 1

    Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2(g)
    (a)
    Lead is getting reduced.
    (b)
    Carbon dioxide is getting oxidised.
    (c)
    Carbon is getting oxidised.
    (d)
    Lead oxide is getting reduced.
    (a)
    and (b)
    (a)
    and (c)
    (a)
    , (b) and (c)
    (iv)
    all
    NCERT’s answer
    (i)

    Working being prepared

  2. Exercise 2

    Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of a
    (a)
    combination reaction.
    (b)
    double displacement reaction.
    (c)
    decomposition reaction.
    (d)
    displacement reaction.
    NCERT’s answer
    (d)

    Working being prepared

  3. Exercise 3

    What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
    (a)
    Hydrogen gas and iron chloride are produced.
    (b)
    Chlorine gas and iron hydroxide are produced.
    (c)
    No reaction takes place.
    (d)
    Iron salt and water are produced.
    NCERT’s answer
    (a)

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  4. Exercise 4

    What is a balanced chemical equation? Why should chemical equations be balanced?

    Solution being prepared

  5. Exercise 5

    Translate the following statements into chemical equations and then balance them.
    (a)
    Hydrogen gas combines with nitrogen to form ammonia.
    (b)
    Hydrogen sulphide gas burns in air to give water and sulpur dioxide.
    (c)
    Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
    (d)
    Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

    Solution being prepared

  6. Exercise 6

    Balance the following chemical equations.
    (a)
    HNO3 + Ca(OH)2\displaystyle 2 → Ca(NO3)2\displaystyle 2 + H2O
    (b)
    NaOH + H2SO4 → Na2SO4 + H2O
    (c)
    NaCl + AgNO3 → AgCl + NaNO3
    (d)
    BaCl2 + H2SO4 → BaSO4 + HCl

    Solution being prepared

  7. Exercise 7

    Write the balanced chemical equations for the following reactions.
    (a)
    Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
    (b)
    Zinc + Silver nitrate → Zinc nitrate + Silver
    (c)
    Aluminium + Copper chloride → Aluminium chloride + Copper
    (d)
    Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride

    Solution being prepared

  8. Exercise 8

    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)
    (b)
    Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
    (c)
    Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
    (d)
    Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)

    Solution being prepared

  9. Exercise 9

    What does one mean by exothermic and endothermic reactions? Give examples.

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  10. Exercise 10

    Why is respiration considered an exothermic reaction? Explain.

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