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The s-Block Elements Test 21

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The s-Block Elements Test 21
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Weekly Quiz Competition
  • Question 1
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    Which of the following does not show the anomalous behaviour of Lithium?
    Solution
    Anomalous behavior of lithium is due to extremely small size of lithium. Its cation on account of small size and high nuclear charge, lithium exerts the greatest polarizing effect out of all alkali metals on the negative ion. Consequently, lithium ion possesses a remarkable tendency towards solvation and develops a covalent character in its compounds.

    But lithium like other metals of the same group is a strong reducing agent. In fact, Lithium is the strongest reducing agent in aqueous solution.

    Thus option D is correct.
  • Question 2
    1 / -0
    Which among the following is kinetically inert towards water? 
    Solution
    Na, K and Ca decompose water by evolving hydrogen gas. However Be does not react with water even when red hot. Its protective oxide layer survives even at high temperature. 
  • Question 3
    1 / -0
    The decreasing order of the second ionization potential of $$Mg,\ Ca$$ and $$Ba$$ is:
    Solution
    The ionization potential decreases down the group as the distance between valence electron and nucleus increases. The ionization potential increases after the successive removal of one or more electrons from isolated gaseous atom. Small size cations will have high ionization potential than large size cations.
    The decreasing order of second ionization potential is: $$Mg > Ca > Ba$$
  • Question 4
    1 / -0
    Fill up the blanks with appropriate choices.
    Lithium and magnesium react slowly with water. Their hydroxides are ________ soluble in water. Carbonates are Li and Mg ________ easily on heating. Both LiCl and $$MgCl_2$$ are ________ in entanol and are ________. They crystallise from their aqueous solutions as _________.
    Solution
    A Diagonal Relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods of the periodic table. These pairs (Li & Mg, Be & Al, B & Si etc.) exhibit similar properties.
  • Question 5
    1 / -0
    The metal ions (charged particles) that are required for contraction of muscles in human beings and animals are ions of:
    Solution
    $$Ca^{2+}$$ ions are required for contraction of muscles in humans.
  • Question 6
    1 / -0
    Cancer is a disease where body cells grow unchecked. A protein found in the body interferes with the growth of cancer cells. It is used for the treatment of cancer. Identify it.
    Solution
    Casein is a slow-digesting dairy protein that people often take as a supplement. It releases amino acids slowly, so people often take it before bed to help with recovery and reduce muscle breakdown while they sleep. Several studies have shown it helps boost muscle growth, along with a ton of other benefits.
    Also Casein interferes with the growth of cancer cells and hence is also used for the treatment of cancer.
    Hence option B is correct answer.
  • Question 7
    1 / -0
    A metal readily forms its sulphate $$MSO_4$$ which is water soluble. It forms its oxide MO which becomes inert on heating. It forms its insoluble hydroxide $$M(OH)_2$$ which is soluble in NaOH solution. What would be M?
    Solution
    Metal Be forms water soluble $$BeSO_4$$ and forms $$BeO $$ which on heating turns inert. $$Be$$ forms an insoluble hydroxide $$Be(OH)_2$$ which is soluble in $$NaOH$$ giving sodium berylate $$Na_2BeO_2$$
  • Question 8
    1 / -0
    The violet flame shown by potassium in Bunsen flame is due to jumping of the electron from :
    Solution
    • On heating an alkali earth metal or its salt, the electrons are excited easily to higher energy levels because of absorption of energy. When these electrons return to their ground states, they emit extra energy in form of radiations which fall in the visible region thereby imparting a characteristic colour to the flame.
    • The violet flame shown by potassiu in Bunsen flame is due to jumping of the electron from $$5p$$ to $$4s$$.
    • Hence, option D is correct answer.
  • Question 9
    1 / -0
    Which of the following metals is required as a cofactor by all enzymes utilizing ATP in phosphate transfer?
    Solution
    Mg binds to phosphate group in ATP thus making a complex that catalyses phosphate transfer. 
  • Question 10
    1 / -0
    Alkaline earth metals are sparingly soluble in water and their carbonates evolve carbon dioxide on heating. Which of the following is not an alkaline earth metal?
    Solution
    The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
    Aluminium is a boron group element. It comes in p-block.
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