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s-Block Elements Test - 4

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s-Block Elements Test - 4
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  • Question 1
    1 / -0
    Which of the following statements is true about the difference between beryllium and magnesium?
  • Question 2
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    One of the following is not called alkaline earth metal.

    Solution

    Alkaline earth metals are called so because of two reasons

    1. Alkaline earth metals are obtained on earth in the form of ores
    2. Oxides and hydroxides of Alkaline earth metals are basic in nature.

    However Beryllium fulfills 1st reason but its oxides and hydroxides are amphoteric so sometimes they say it is not alkaline earth metal. but as it is amphoteric IUPAC has accepted this as alkaline earth metal

  • Question 3
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    The diagonal relationship exists between

    Solution

    Lithium shows diagonal relationship to Magnisium due to their nearly same polarising power, comparable electronegativities(Li=1.00, Mg=1.20) and small difference in radius (Li=152Pm, Mg=159pm).

  • Question 4
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    Directions: The following question has four choices out of which ONLY ONE is correct.

    Which of the following would react most vigorously with water?
  • Question 5
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    Group I elements of the periodic table are collectively known as

    Solution

    Group I (ns1) elements  react vigorously with water to produce an alkaline solution thus collectively known as alkali metals

  • Question 6
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    Monovalent sodium and potassium ions found in large proportions in biological fluids. They help in

    Solution

    Na and K ions help in transmission of nerve impulses , in regulating the flow of water accross the cell membranes and in the transport of sugar and amino acids in to cells. so monovalent sodium and potassium ions found in large proportions in biological fluids

  • Question 7
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    MgSO4 is soluble in water, but BaSO4 is not because
  • Question 8
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    The s-block elements of the Periodic Table have only

    Solution

    s block comprises of only two groups alkali metal group and alkaline earth metal groups

  • Question 9
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    A crystalline salt Na2SO4.xH2O loses 55.9% of its weight on heating. The formula of the crystalline salt is
  • Question 10
    1 / -0
    Inert pair effect is observed when
  • Question 11
    1 / -0
    Which of the following alkaline earth metal hydroxides is amphoteric in nature?
  • Question 12
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Flame test is not given by 
  • Question 13
    1 / -0
    Thermally, the most stable alkaline earth metal carbonate is 
  • Question 14
    1 / -0
    Soda ash is
  • Question 15
    1 / -0
    Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts because of their
  • Question 16
    1 / -0
    Potassium superoxide finds usage in breathing equipment and safeguards the user to breathe in oxygen generated internally in the apparatus, without being exposed to toxic fumes outside. The supply of oxygen is due to

    (i) slow decomposition of KO2
    (ii) reaction of superoxide with moisture in the exhaled air
    (iii) reaction of KO2 with CO2 in the exhaled air
  • Question 17
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    Which of the following statements is true regarding isolation of Na and K metals?
  • Question 18
    1 / -0
    Alkaline earth metals are not found free in nature because of
  • Question 19
    1 / -0
    The decreasing order of thermal stability of alkaline earth metal carbonates, MgCO3, CaCO3, BaCO3 and SrCO3, is
  • Question 20
    1 / -0
    Which of the following compounds is used as an antacid to neutralise excess acid in the stomach?
  • Question 21
    1 / -0

    Group IlA of the periodic table consists of the six elements are collectively known as

    Solution

    because their oxide and hydroxide are alkaline in nature and these metal oxide are found in earth's crust 

  • Question 22
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    One of the following is highly radioactive

    Solution

    Fr is highly radioactive metal, that decays in to astatine,,radium and radon , it is also highly unstable element found only in trace amount on earth.

  • Question 23
    1 / -0
    The substance used in the preparation of HCl is
  • Question 24
    1 / -0

    Calcium and Magnesium belong to the category of

    Solution

    calcium and megnesium are 2nd group element of periodic table which are obtaine on earth in the form ore, their oxides and hydroxide are alkaline in nature so they are alkaline earth metals

  • Question 25
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    The most common alum is
  • Question 26
    1 / -0
    Which of the following compounds is known as "photographer's fixer"?
  • Question 27
    1 / -0

    Sodium and potassium belong to the category of

    Solution

    Na and K are shiny, soft, highly reactive metal at standard temperature and pressure and electronic configuration of Na & K  is ns2, compounds of Na & K are available most aboundenty in nature so these two are alkali metal.

  • Question 28
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    A cracking sound is produced when crystals of NaCl are thrown in fire. This is due to the
  • Question 29
    1 / -0
    Which of the following is used for taking the X-ray spectra of the digestive system?
  • Question 30
    1 / -0

    Increase in ionic radii of alkali metals  in aqueous solution (hydration) follow the order 

    Solution

    The alkali metal ions get extensively hydrated in aqueous solution. Smaller the ion more is the degree of hydration.  

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