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s-Block Elements Test - 6

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s-Block Elements Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The hydroxide with the least Ksp value at room temperature is
  • Question 2
    1 / -0

    The alkali metals dissolve in liquid ammonia giving deep blue solutions. When they become diamagnetic, the solution turns into

    Solution

    When the solution become diamagnetic due to formation of electron cluster in which ammoniated electron with opposite spin group-  it changes its  color  to bronze.

  • Question 3
    1 / -0

    Alkali metal chlorides donot form hydrates except for one metal. Choose from among the options given below.

    Solution

    Lithium due to its high hydration energy(deliquescent) forms hydrate.

  • Question 4
    1 / -0
    The metallic luster of sodium is explained by
  • Question 5
    1 / -0

    Lithium has most negative E0 value, its reaction with water is less vigorous than that of sodium which has the least negative E0 value among the alkali metals. The reason is

    Solution

    This behaviour of lithium is attributed to its small size and very high hydration energy. Li+ has maximum degree of hydration.

  • Question 6
    1 / -0

    The common salt or table salt is

    Solution

    Common salt is sodium chloride i.e. NaCl. It is generally obtained by evaporation of sea water. It is used as a table salt for domestic purposes.

  • Question 7
    1 / -0
    When ammoniacal solution of MgSO4 is heated with Na2HPO4 in the presence of NH4Cl, a white precipitate of _____ is formed.
  • Question 8
    1 / -0

    2M + 2H2O →2M++ 2OH−+ H2 What is M?

    Solution

    M is alkali metal. Alkali metals reacts with water vigorously to form hydroxide (OH-) and dihydrogen (H2)

  • Question 9
    1 / -0
    Highly pure dilute solution of sodium in liquid ammonia

    a. shows blue colour
    b. exhibits electrical conductivity
    c. produces sodium amide
    d. produces hydrogen gas
  • Question 10
    1 / -0
    Cs+ ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have
  • Question 11
    1 / -0
    In case of alkali metals, the covalent character decreases in the order
  • Question 12
    1 / -0
    The correct order of solubility of the sulphates of alkaline earth metals in water is
  • Question 13
    1 / -0
    Which of the following compounds on thermal decomposition forms basic as well as acidic oxide?
  • Question 14
    1 / -0
    Sodium nitrate decomposes above 800oC to give
  • Question 15
    1 / -0
    The correct order of increasing ionic character is
  • Question 16
    1 / -0
    The order of solubility of lithium halides in non-polar solvents is
  • Question 17
    1 / -0
    A sodium salt upon heating with MgCI2 gives a white precipitate. The anion of the sodium salt is
  • Question 18
    1 / -0
    Ba, Sr, Ca and Mg may be arranged in order of decreasing first ionization energy (IE1) as
  • Question 19
    1 / -0
    Which of the following statements is false?
  • Question 20
    1 / -0
    A metal M readily forms a water soluble sulphate MSO4, water insoluble hydroxide M(OH)2 and oxide MO, which becomes inert upon heating. The hydroxide is soluble in NaOH. The metal M is
  • Question 21
    1 / -0

    When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to

    Solution

    The alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting in nature. The blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution.

    M + (x + y) NH3 → [M (NH3)x]+[e (NH3)y]−

  • Question 22
    1 / -0

    All alkali metal halides are soluble in water except

    Solution

    Greater the lattice energy, higher is the melting point of the MX (metal halide) and lower is its solubility

  • Question 23
    1 / -0
    All the compounds listed below will react with water. In which of the following cases is the same gaseous product obtained?

    a. Na
    b. Na2O2
    c. KO2
    d. NaH
  • Question 24
    1 / -0

    Lithium halides are somewhat covalent because

    Solution

    Li+ ion has small size and maximum tendency to attract the electrons towards itself from the negative ion. This distortion of the electron cloud of the negative ion by the positive ion is known as polarization. Thus Li+ has high polarisation capability. Lithium iodide is the most covalent in nature.

  • Question 25
    1 / -0
    What type of ions are present in anhydrous mixture of KF and HF?
  • Question 26
    1 / -0
    Which of the following pairs of elements will respectively give superoxides and peroxides when heated with excess of air?

    a. K, Br
    b. Na, Rb
    c. K, Rb
    d. Na, Ba
  • Question 27
    1 / -0

    Choose the correct trend of the melting and boiling points in the alkali metal halides, MF, MCl, MI, MBr.

    Solution

    Smaller is the size of anion less is the polarizing power of anion so greater is the ionic character hence greater will be melting point.

  • Question 28
    1 / -0
    Which of the following alkali metals forms only normal oxide, M2O, on heating in air?
  • Question 29
    1 / -0
    A chemical compound 'A' is used to remove temporary hardness from water. It reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through 'A', it turns cloudy. What is the chemical formula of 'A'?
  • Question 30
    1 / -0

    Washing soda is

    Solution

    Washing soda is Na2CO3.10H2O i.e. sodium carbonate decahydrate. It is used in water softening, laundering and cleaning, manufacture of glass etc.

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