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S-Block Elements Test - 7

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S-Block Elements Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0

    An alkali metal which exists in the liquid state at (or near) room temperature is

    Solution

    Among metals, the alkali metals have low melting points, which decrease further on moving down the group.
    Caesium or cesium is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28°C (82°F), which makes it one of the only five elemental metals that are liquid at (or near) room temperature.

     

  • Question 2
    1 / -0

    Arrange the following metals in decreasing order of their hydration enthalpy.

    Li, Rb, Na, K, Cs

    Solution

    This option is correct because lithium, being exceptionally small in size, has the maximum hydration enthalpy and hydration enthalpy decreases down the group.

     

  • Question 3
    1 / -0

    The following question has four choices, out of which, ONLY ONE is correct.

    Which of the following statements is/are NOT true regarding alkali metal oxides?

    Solution

    The statement in option (3) is incorrect as alkali metals combine with oxygen to form simple oxides and peroxides also.

     

  • Question 4
    1 / -0

    The correct order of increasing lattice energy of the following metallic compounds is

    Solution

    Lattice energy increases as the charge on ion increases and it decreases as the size of ion increases.

     

  • Question 5
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.

    The molecular formula of Glauber's salt is

    Solution

    The hydrate of sodium sulphate is known as Glauber's salt (Na2SO4.10H2O).

     

  • Question 6
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.

    NaOH solution is soapy to touch because

    Solution

    Solution of sodium hydroxide is soapy to touch because when a concentrated solution of sodium hydroxide comes in contact with skin, it breaks down the skin and flesh to a pasty mass.

     

  • Question 7
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    Which of the following alkaline earth metals will give grassy green colour in flame?

    Solution

    Barium gives grassy green colour in flame.

     

  • Question 8
    1 / -0

    Which of the following is not an ore of magnesium?

    Solution

    Gypsum is a very soft sulphate mineral composed of calcium sulphate dihydrate. Since the chemical formula of gypsum does not contain magnesium, it is not an ore of magnesium.
    Kieserite (MgSO4·H2O), Dolomite (CaMg(CO3)2) and Magnesite (MgCO3) are ores of magnesium.

     

  • Question 9
    1 / -0

    Which of the following statements is false in case of alkali metals?

    Solution

    Oxides of alkali metals are strong bases and sodium oxide is basic in nature.

     

  • Question 10
    1 / -0

    The affinity of sodium with water is used in drying of

    Solution

    Sodium can be used to dry benzene since it does not react with benzene.

     

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