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Is Matter Around Us Pure Test - 3

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Is Matter Around Us Pure Test - 3
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  • Question 1
    1 / -0
    Elements and compounds are both made up of the same kind of constituent particles, and represent pure substances. Which among the given pure substances is an element?
    Solution
    Among the given options, only mercury is an element.
    It is a metallic element.
  • Question 2
    1 / -0
    Glucose is a compound of carbon, hydrogen and oxygen. Identify the incorrect statement regarding it.
    Solution
    Compounds are formed as a result of chemical reactions and do not display the properties of their constituent elements.
    Glucose being a compound has unique properties of its own and does not exhibit the properties of carbon, oxygen or hydrogen.
  • Question 3
    1 / -0
    Which of the following options shows a correct match between the given substance and its property?
    Solution
    A mixture is a material, which contains two or more different kinds of particles (atoms or molecules) which are physically mixed in any proportion, but not chemically combined. Mixture can be homogeneous or heterogeneous. Homogeneous mixture has a uniform composition. The components of homogeneous mixtures are not visible to the naked eye or even under a microscope. There are no visible boundaries of separation between the components of a homogeneous mixture, whereas heterogeneous mixtures are either visible to the naked eye or under microscope.
    Mixture of sand and water has a non-uniform composition and the components of mixture (i.e. sand and water) are visible to naked eye. Therefore, it is a heterogeneous mixture.
    Mixture of sugar and water is a homogeneous mixture having a uniform composition as sugar particles are small and dissolve completely in water.
    Water is a compound made up of two elements, hydrogen (H) and oxygen (O), chemically combined in a fixed proportion of 1: 8 by mass. Water has a fixed boiling point of 100°C.
    Sugar is also a compound and it has a fixed melting point.
    Therefore, only option (3) is correct.
  • Question 4
    1 / -0
    If a solution is prepared by dissolving 20 g of sugar in water and the volume of the water taken is 200 ml, then the concentration in terms of mass by mass percentage of the solution is ___________.
    Solution
    Concentration of solute is defined as the amount of solute present in given amount (mass or volume) of solution or the amount of solute dissolved in a given mass or volume of a solvent. If a solution is prepared by dissolving a solid solute in a liquid solvent, the concentration of the solution is expressed in mass by mass percentage or mass by volume percentage. Mass by mass percentage is defined as the mass of the solute in grams dissolved in 100 grams of the solution.
    Mass by mass percentage = × 100
    According to the question:
    Volume of the solvent (water) = 200 mL
    Since, density of water is 1 g mL-1, mass of water = 200 g
    Putting these values in the formula:
    Mass by mass percentage = × 100
    = × 100 = 9.09%
  • Question 5
    1 / -0
    Emulsions are a colloidal mixture of two immiscible liquids. For example, milk is an emulsion of fat in water. The components of this emulsion can be separated by
    Solution
    Even though it is a mixture of immiscible liquids, the components will not separate out into layers because the dispersed phase, being particles of colloidal size will remain suspended.
    However, centrifugation will cause the less dense component (in this case fat) to float on top.
  • Question 6
    1 / -0
    The particles of which of the following mixtures can be separated by ultrafiltration but not by filtration through the ordinary filter paper?
    Solution
    Particles of a colloid can be separated by ultrafiltration but not by simple filtration as they are too small and pass through the holes of the ordinary filter paper.
    Among the given options, blood is a colloid and its components can be separated by ultrafiltration but not by ordinary filtration.
  • Question 7
    1 / -0
    The property of the particles of a true solution that makes it a homogeneous mixture is
    Solution
    The particles of the solute are small in size and have a small mass. Hence, the force of gravity acting on them is small and they do not settle down under the effect of their own weight, but remain in motion and maintain the uniformity of the composition by moving from their higher concentration to their lower concentration.
    As a result, a solution is a homogeneous mixture.
  • Question 8
    1 / -0
    In a 30% solution of table salt, the masses of salt and water in a 100 g sample of the solution respectively are
    Solution
    Mass of solution is 100 g.
    Percentage of salt in the solution = 30%
    Amount of salt in the solution = 30 g
    Amount of water in the sample = 100 - 30 = 70 g
  • Question 9
    1 / -0
    A mixture of iron and sulphur was taken in two test tubes 'X' and 'Y' and the latter was subjected to heat. Then a few drops of hydrochloric acid were added to both the test tubes and effervescence was observed in both the cases. The gases that evolved in the test tubes 'X' and 'Y' respectively were:
    Solution
    The test tube 'X' was not heated and contained a mixture of iron and sulphur.

    The reaction that occurs with dil HCl is:


    The test tube 'Y' was heated and iron and sulphur reacted to form iron sulphide, which then reacted with HCl to form H2S gas.
  • Question 10
    1 / -0
    Which among the given molecules is homonuclear?
    Solution
    The molecules of elements are made up of the same kind of atoms and are homonuclear. Ozone (O3) is an element and is a homonuclear molecule; but water (H2O), carbon dioxide (CO2) and ammonia (NH3) are compounds and are heteronuclear.
  • Question 11
    1 / -0
    Tincture of iodine is a solution used as an antiseptic to clean wounds. This is prepared by dissolving solid iodine in
    Solution
    In the tincture of iodine, the solvent is alcohol while the solute is iodine. Tincture of iodine is also known as a weak iodine solution or iodine tincture. Iodine tincture is an antiseptic used to disinfect the wounds.
  • Question 12
    1 / -0
    Solder is an alloy of
    Solution
    An alloy is a homogeneous mixture of two or more metals. It may also contain a non-metal. Solder is an alloy of lead and tin.
  • Question 13
    1 / -0
    Which of the following is not a suspension?
    Solution
    Milk is a colloid and not a suspension.
    A colloid is a mixture that has particles ranging between 1 and 1000 nanometers in diameter, yet are still able to remain evenly distributed throughout the solution. These are also known as colloidal dispersions because the substances remain dispersed and do not settle to the bottom of the container.
  • Question 14
    1 / -0
    Which process is used to separate a mixture of two miscible liquids A and B having boiling points 56°C and 65°C?
    Solution
    Since the difference between the boiling points of the two liquids is less than 25 K, they will be separated by fractional distillation.
  • Question 15
    1 / -0
    At 80°C and 1 atmosphere pressure, the maximum amount of ammonium chloride which can be dissolved in 100 g of water is 66 g. What is the solubility of ammonium chloride in water at 80°C in 50 g of water?
    Solution
    Solubility of a substance is the maximum amount of solute that can dissolve in a fixed amount of solvent at a given temperature. It remains fixed for a substance at a particular temperature.
    Therefore, if 100 g of water can dissolve 66 g of NH4Cl, then 50 g of water can dissolve 33 g of it.
  • Question 16
    1 / -0
    Why is the separation of rock and diamond done by mechanical picking?
    Solution
    The separation of rock and diamond is done by mechanical picking because they have different colours.
    The different appearance and less abundance of diamond particles in the mixture make hand picking easy and convenient.
  • Question 17
    1 / -0
    The method suitable for the separation of two components of different densities is:
    Solution
    Centrifugation involves agitating a given mixture so that the lighter component floats at the surface while the denser component settles at the bottom.
    Hence, this method is suitable for separating a mixture in which the components have different densities.

  • Question 18
    1 / -0
    Which method is used to separate few micrograms of a substance in a mixture?
    Solution
    Chromatography is the most suitable technique for separating small quantities of dissolved components which relatively differ in their solubilities.
  • Question 19
    1 / -0
    There are four liquids P, Q, R and S. Density of P is the most followed by the density of Q, R and S. Which of the following liquids would be collected at the bottom of the separating funnel?
    Solution
    When a mixture of immiscible liquids is left undisturbed, the components separate out in different layers according to their densities, with the one with the maximum density forming the lowermost layer.
  • Question 20
    1 / -0
    The method of crystallisation is based on the
    Solution
    Pure crystals of a salt are extracted by cooling its supersaturated solution. First, a supersaturated solution is prepared by heating a substance as the solubility increases on heating. When this solution is cooled slowly, the pure crystals separate out as the solubility decreases on cooling.
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