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S-Block Elements Test - 13

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S-Block Elements Test - 13
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  • Question 1
    1 / -0

    Cs+ ions impart violet to Bunsen flame. This is due to the fact that the emitted radiations are of

    Solution

    Emmited wavelength lies in visible region

    Blue has high frequency low wavelength -high energy

  • Question 2
    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

    Be2+ →  Al3+ + Be2+ is diagonaly similar with Al3+ & Al3+ is amphoteric in nature.

  • Question 3
    1 / -0

    An alkaline earth metal (M) gives a salt with chlorine, which is soluble in water at room temperature. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called `lithopone'-a white pigment. Metal M is-

    Solution

    Lithopane is (BaSO4 + ZnS)
    white pigment
    BaSO4 is insoluble in water

  • Question 4
    1 / -0

    The reaction of an element A with water produces combustible gas B and an aqueous solution of C. When another substance D reacts with this solution C also produces the same gas B.D also produces the same gas even on reaction with dilute H2SO4 at room temperature. Element A imparts golden yellow colour to Bunsen flame. Then A,B,C and D may be identified as

    Solution


    Zn + NaOH → Na2ZnO2 + H2
    Amphoteric
    Nz + dil H2SO4 → ZnSO4 + H2

  • Question 5
    1 / -0

    The hydroxide of alkaline earth metal, which has the lowest value of solubility product (Ksp) at normal temperature (25°C) is-

    Solution

    Be(OH)2 down the group solubility increase

  • Question 6
    1 / -0

    (Yellow ppt) T  X  Y. (Yellow ppt) + Z­ (pungent smellinggas)

    If X gives green flame test. Then, X is :

    Solution

    Green flame is given by Ba2+

    BaS2O3+K2CrO4 → BaCrO4+K2S2O3   yellow ppt

  • Question 7
    1 / -0

    Which of the following carbonate of alkali metals has the least thermal stability ?

    Solution

    T.S ∞ Ionic character (for polyatomic anion)
    Li2CO3 is least ionic or most covalent

  • Question 8
    1 / -0

    The `milk of magnesia' used as an antacid is chemicaly -

    Solution

    Mg(OH)2
    Base or Antacid which distroys and as per neutralisation reaction

  • Question 9
    1 / -0

    The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to

    Solution

    K2O,    KO2,  K2O2
    Rb2O,   RbO2,   Rb2O2
    Na, Li from normal oxide

  • Question 10
    1 / -0

    The pair of compounds, which cannot exist together in a solution is-

    Solution

    NaHCO3 + NaOH   Na2CO3 + H2O


    Acidic  Base hydrogen

  • Question 11
    1 / -0

    The formula of soda ash is

    Solution

    Soda ash is Na2CO3.

  • Question 12
    1 / -0

    The hydration energy of Mg2+ is -?

    Solution

    Hydration energy ∞ polarising power
    Na+ < Mg2+ < Mg3+ < Be3+ < Al3+

  • Question 13
    1 / -0

    The golden yellow colour associated with NaCl to Bunsen flame can be explained on the basis of -

    Solution

    In frame test thermal excitation deexcitation takes place in cation with low Ionisation potential

  • Question 14
    1 / -0

    Solution of sodium metal in liquid ammonia is a strong reducing agent due to presence of -?

    Solution

  • Question 15
    1 / -0

    The order of solubility of lithium halides in non polar solvents follows the order.

    Solution

    As the size of the anion increases from  to , the covalent character increase and hence the solubility in non-polar solvent increases. 

  • Question 16
    1 / -0

    The salt which finds uses in qualitative inorganic analysis is -?

    Solution

    Microcosinic salt is used in microcosmicbed test

  • Question 17
    1 / -0

    Fire extinguishers contain -?

    Solution

    NaHCO3 + H2SO4 →  Na2SO4 + H2O + CO2
    extingusher fire

  • Question 18
    1 / -0

    CsBr3 contains -?

    Solution

    Cs is highly electropositive & forms ionic bond with Cs+ cation.

  • Question 19
    1 / -0

    Alkali metals reacts with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?

    Solution

    Na + Al2O3 → Na2O + Al (Position in electrochemical series)
    Na2O + CO2 → Na2CO3

  • Question 20
    1 / -0

    The correct order of second ionisation potentials (IP) of Ca, Ba and K is -

    Solution

    K [Ar] 4s1 →  second ionisation is extremely difficult.
    Ca [Ar] 4s2
    Ba  [Xe] 5S2

  • Question 21
    1 / -0

    EDTA is used in the estimation of - ?

    Solution

  • Question 22
    1 / -0

    aq. NaOH + P4 (white) → PH3 + X; compound X is

    Solution

  • Question 23
    1 / -0

    The correct order of solubility is -?

    Solution

    Evident from Fajan rule

  • Question 24
    1 / -0

    The complex formation tendency of alkaline earth metals decreases down the group because -

    Solution

    Down the group Zeff decrease & complex farmation tendeny decrease

  • Question 25
    1 / -0

    The alkaline earth metals, which do not impart any colour to Bunsen flame are -

    Solution

    Be & Mg due to small size does not impart colour to the flame as excitation & deexcitation is not possible.

  • Question 26
    1 / -0

    The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?

    Solution

    (d) Among alkali metals, melting point decreases as the strength of metallic bonding decreases with increasing size of the atom. Thus, Cs has the lowest melting point (28.5°C) and will melt at 30°C.

  • Question 27
    1 / -0

    A metal M readily forms water soluble sulphate, and water insoluble hydroxide M(OH)2. Its oxide MO is amphoteric, hard and having high melting point. The alkaline earth metal M must be -

    Solution

    BeO is amphoteric due to its diogional similarly with Al

  • Question 28
    1 / -0

    When K2O is added to water, the solution becomes basic in nature because it contains a significant concentration of -

    Solution

    K2O + H2O → KOH

  • Question 29
    1 / -0

    If A is the metallic salt, then the white ppt. of D must be of -?

    Solution


  • Question 30
    1 / -0

    (Mily Cloud) 

    The chemical formulae of A and B are -?

    Solution


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