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Chemical Reacti...

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  • Question 1
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    The chemical reactions and its corresponding observable features are listed below.

    a. Change in temperature (i) Magnesium reacting with dilute sulphuric acid
    b. Evolution of a gas (ii) Potassium iodide reacting with lead nitrate
    c. Formation of a precipitate (iii) Sulphur dioxide gas reacting with acidified potassium dichromate solution
    d. Change in colour (iv) Zinc granules reacting with dilute sulphuric acid


    Choose the most appropriate code from among the options given below:

  • Question 2
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    Consider the following hypothetical reaction and fill in the blanks by choosing the correct option.

    x + y - z → x - z + y

    In the given chemical reaction, old bonds between _________ are broken and new bonds between _________ are formed.

  • Question 3
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    Quicklime combines with water to form 'X'. Identify 'X' and indicate the energy change involved.

  • Question 4
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    Which of the following reactions requires the highest temperature to occur?

  • Question 5
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    Consider the following reaction:

    Al(s) + Fe2O3(s) → Al2O3(s) + Fe(s)

    Which of the following statements is not correct about the given reaction?

  • Question 6
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    Consider the following chemical reaction:

    HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(l)

    The given reaction is an example of

  • Question 7
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    Consider the following statements about redox reactions:

    (i) A substance is said to be reduced if it gains electrons during a reaction.
    (ii) A substance is said to be oxidised if it gains hydrogen during a reaction
    (iii) A substance is said to be reduced if it loses oxygen during a reaction.
    (iv) A substance is said to be reduced if it gains hydrogen during a reaction.

    Which of the given statements is/are correct?

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