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{:(" ""A"," ""B"),...

`{:(" ""A"," ""B"),("1. Kerosene from water","a. Chemical change"),("2. Iron pins from sand","b. Centrigugation"),("3. Butter from curd","c. Physical change"),("4. Digestion of food separation","d. Magnetic"),("5. Freezing of water","e. Decantation"):}`

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The correct Answer is:
1 - e, 2 - d, 3 - b, 4 - a, 5 - c
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{:("A","B"),("1) Parenchyma","a) Thin walled packing cells"),("2) Photosynthesis","b) Carbon fixation"),("3) Aerenchyma","c) Localized thickenings"),("4) Collenchyma","d) Buoyancy"),("5) Permanent tissue","e) Sclerenchyma"):}

Which of the following are chemical changes ? (a) growth of a Plant (b) Rusting of Iron ( c) Mixing of Iron Filing and sand (d) Cooking of Food ( e) Digestion of food ( f) Freezing of water ( g) Burning of Candle.

Knowledge Check

  • A mixture contain four solid organic compounds A.,B ,C and D .on heating only C changes from the solid to vapour state. the compound C can be separated from the rest by

    A
    Distillation
    B
    Sublimation.
    C
    Fractional distillation
    D
    Crystallisation

  • In the reaction A + B rarr 3C + 2D , the rate of disappearance of B is 1 xx 10^(-2) mol L^(-1) s^(-1) . The rate of change in concentration of A and C are respectively

    A
    `0 cdot 5 xx 10^(-2) mol L^(-1) s^(-1), 1 cdot 5 xx 10^(-2) mol L^(-1) s^(-1)`
    B
    `1 cdot 5 xx 10^(-2) mol L^(-1) s^(-1), 0 cdot 5 xx 10^(-2) mol L^(-1) s^(-1)`
    C
    `2 xx 10^(-2) mol L^(-1) s^(-1), 3 xx 10^(-2) mol L^(-1) s^(-1)`
    D
    None of these

  • Let A = {1, 2, 3, 4} and B = {1, 2} . Then the number of onto functions from A onto B is

    A
    14
    B
    16
    C
    12
    D
    8

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    Which of the following are chemical changes ? (a) Growth of a plant (b) Rusting of Iron (c) Mixing of Iron filings and sand (d) Cooking of food (e) Digestion of food (f) Freezing of water (g) Burning of a candle

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    Which separation techniques will you apply for the separation of the following ? a. Sodium chloride from its solution of water. b. Ammonium chloride from a mixture. c. Small pieces of metal in the engine oil of car. d. Different pigments from an extract of flower petals, e. Butter from curd. f. Oil from water. g. Tea leaves from tea. h. Iron pins from sand. i. Wheat grains from husk j. Fine mud particles suspended in water.

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