Science

10th

grade

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chemical reactions and equations

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  • 1. Multiple Choice
    30 seconds
    1 pt

    Which of the following is not a physical change?

    (a) Boiling of water to give water vapour

    (b) Melting of ice to give water

    (c) Dissolution of salt in water

    (d) Combustion of Liquefied Petroleum Gas (LPG)

  • 2. Multiple Choice
    1 minute
    1 pt

    Which of the following statements about the given reaction are correct?

    3Fe(s) + 4H2O(g) ® Fe3O4(s) + 4H2(g)

    (i) Iron metal is getting oxidised

    (ii) Water is getting reduced

    (iii) Water is acting as reducing agent

    (iv) Water is acting as oxidising agent

    (a) (i), (ii) and (iii)

    (b) (iii) and (iv)

    (c) (i), (ii) and (iv)

    (d) (ii) and (iv)

  • 3. Multiple Choice
    2 minutes
    1 pt

    Three beakers labelled as A, B and C each containing 25 mL

    of water were taken. A small amount of NaOH, anhydrous

    CuSO4 and NaCl were added to the beakers A, B and C

    respectively. It was observed that there was an increase in

    the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the

    solution falls. Which one of the following statement(s) is(are) correct?

    (i) In beakers A and B, exothermic process has occurred.

    (ii) In beakers A and B, endothermic process has occurred.

    (iii) In beaker C exothermic process has occurred.

    (iv) In beaker C endothermic process has occurred.

    (a) (i) only

    (b) (ii) only

    (c) (i) and (iv)

    (d) (ii) and (iii)

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