JEE Main & Advanced Chemistry The s-Block Elements / s-ब्लॉक के तत्व Question Bank

done Mock Test - The s-Block Elements Total Questions - 25

• question_answer1)
  Sodium cannot be extracted by the electrolysis of brine solution because:
  A)
  Sodium liberated reacts with water to produce \[NaOH+{{H}_{2}}\] done clear
  B)
   Sodium being more electropositive than hydrogen, \[{{H}_{2}}\]is liberated at cathode and not sodium done clear
  C)
   electrolysis cannot take place with brine solution done clear
  D)
   none of the above done clear
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• question_answer2)
  Soilium chloride imparts a golden yellow colour to the Bunsen flame. This can be interpreted due to:
  A)
  low ionization potential of sodium done clear
  B)
   photosensitivity of sodium done clear
  C)
   sublimation of metallic sodium to give yellow vapour. done clear
  D)
   emission of excess of energy absorbed as a radiation in the visible region done clear
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• question_answer3)
  K, Ca and Li metals may be arranged in the decreasing order of their standard electrode potentials as
  A)
  K, Ca, Li           done clear
  B)
  Li, K, Ca done clear
  C)
  Li, Ca, K          done clear
  D)
  Ca, Li, K done clear
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• question_answer4)
  Alkli metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
  A)
  Li                     done clear
  B)
  Na done clear
  C)
  K                     done clear
  D)
  Cs done clear
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• question_answer5)
  Potassium superoxide (\[K{{O}_{2}}\]) is used in space capsules, submarines, and breathing masks, because it is
  A)
  diamagnetic in nature done clear
  B)
   high melting compound done clear
  C)
   helpful in removing \[C{{O}_{2}}\]and producing \[{{O}_{2}}\] done clear
  D)
   unstable compound done clear
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• question_answer6)
  Sodium is heated n excess of air, free from \[C{{O}_{2}}\]at \[350{}^\circ \]C to from X. X. absorbs \[C{{O}_{2}}\] and forms \[N{{a}_{2}}C{{O}_{3}}\]and Y. 'X' and 'Y' are respectively:
  A)
  \[N{{a}_{2}}{{O}_{{}}}\]and \[{{O}_{2}}\] done clear
  B)
  \[N{{a}_{2}}{{O}_{2}}\]and \[{{O}_{2}}\] done clear
  C)
  \[Na\]\[{{O}_{2}}\] and \[{{O}_{2}}\] done clear
  D)
  \[N{{a}_{2}}{{O}_{2}}\] and \[{{O}_{3}}\] done clear
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• question_answer7)
  The order of melting point of chlorides of alkali metals is:
  A)
  LiCl> Nacl> KCl> CsCl done clear
  B)
   LiCl> NaCl> KCl> CsCl done clear
  C)
   NaCl> KCl> CsCl> LiCl done clear
  D)
   LiCl> NaCI> CsCl> KCI done clear
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• question_answer8)
  A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is:
  A)
  \[N{{a}_{2}}C{{O}_{3}}\]      done clear
  B)
  \[KN{{O}_{3}}\] done clear
  C)
  \[{{K}_{2}}C{{O}_{3}}\]        done clear
  D)
  \[Cu{{(OH)}_{2}}\] done clear
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• question_answer9)
  \[NaOH\]is prepared by the electrolysis of:
  A)
  aqueous solution of sodium chloride with platinum electrodes done clear
  B)
   molten sodium chloride with graphite anode and iron cathodes done clear
  C)
   sodium carbonate with platinum electrodes done clear
  D)
   sodium carbonate with nickel electrodes done clear
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• question_answer10)
  A and B are two salts. A with dilute HCl and B with cone. \[{{H}_{2}}S{{O}_{4}}\]react to give reddish brown vapours, hence a and B respectively are:
  A)
  NaBr, \[NaN{{O}_{3}}\] done clear
  B)
  \[NaN{{O}_{3}}\], NaBr done clear
  C)
  NaBr,\[NaN{{O}_{2}}\] done clear
  D)
  \[NaN{{O}_{2}}\], NaBr done clear
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• question_answer11)
  At higher temperature sodium metal reacts with alumina to give a sodium compounds 'X', 'X' is dissolved in water and then carbon dioxide gas is passed through it, a compound 'Y' us formed. The compound 'X', 'Y' are respectively
  A)
  \[N{{a}_{2}}{{O}_{2}}\] and \[N{{a}_{2}}C{{O}_{3}}\] done clear
  B)
  \[N{{a}_{2}}O\] and \[N{{a}_{2}}C{{O}_{3}}\] done clear
  C)
   \[N{{a}_{2}}{{O}_{2}}\] and \[NaAl{{O}_{2}}\] done clear
  D)
  \[NaAl{{O}_{2}}\] and \[N{{a}_{2}}C{{O}_{3}}\] done clear
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• question_answer12)
  The correct order regarding the solubility of alkaline earth metal chlorides in water is
  A)
  \[BeC{{l}_{2}}<MgC{{l}_{2}}<CaC{{l}_{2}}<SrC{{l}_{2}}<BaC{{l}_{2}}\] done clear
  B)
  \[~MgC{{l}_{2}}>CaC{{l}_{2}}>BeC{{l}_{2}}>BaC{{l}_{2}}>SrC{{l}_{2}}\] done clear
  C)
  \[~BaC{{l}_{2}}>MgC{{l}_{2}}>CaC{{l}_{2}}>BeC{{l}_{2}}>SrC{{l}_{2}}\] done clear
  D)
  \[~BeC{{l}_{2}}>MgC{{l}_{2}}>CaC{{l}_{2}}>SrC{{l}_{2}}>BaC{{l}_{2}}\] done clear
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• question_answer13)
  A metal M readily forms its sulphate \[MS{{O}_{4}}\]which is watersoluble. It forms its oxide MO which becomes inert on heating. It forms its insoluble hydroxide M\[{{(OH)}_{2}}\] which is soluble in NaOH solution. Then M is
  A)
  Mg                    done clear
  B)
  Ba done clear
  C)
  Ca                   done clear
  D)
  Be done clear
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• question_answer14)
  A solid compound 'X' on heating gives \[C{{O}_{2}}\]gas and a residue. The residue mixed with water forms 'Y' on passing an excess of \[C{{O}_{2}}\]through 'Y' in water a clear solution 'z' is obtained. On boiling 'Z' compound, 'X' is reformed. The compound 'X' us
  A)
  \[Ca{{(HC{{O}_{3}})}_{2}}\]  done clear
  B)
  \[CaC{{O}_{3}}\] done clear
  C)
  \[N{{a}_{2}}C{{O}_{3}}\]      done clear
  D)
  \[{{K}_{2}}C{{O}_{3}}\] done clear
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• question_answer15)
  The decreasing order of the second ionization potentials of K, Ca and Ba is
  A)
  K>Ca>Ba         done clear
  B)
  Ca>Ba>K done clear
  C)
  Ba>K>Ca        done clear
  D)
  K>Ba>Ca done clear
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• question_answer16)
  In the manufacture of metallic sodium by the fused salt electrolysis (Down's process) a small amount of calcium chloride is added to
  A)
  improve the electrical conduction done clear
  B)
   increase the temperature of electrolysis done clear
  C)
   Bring down the melting temperature done clear
  D)
   Stabilize the metallic sodium done clear
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• question_answer17)
  The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to\[30{}^\circ C\]?
  A)
  Na                    done clear
  B)
  K done clear
  C)
  Rb                   done clear
  D)
  Cs done clear
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• question_answer18)
  Sodium when heated in a current of dry ammonia gives
  A)
  Sodium nitrite done clear
  B)
  Sodium hydride done clear
  C)
  Sodium amide done clear
  D)
  Sodium azide done clear
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• question_answer19)
  A metal M readily forms sulphate \[MS{{O}_{4}}\]which is water insoluble. It forms oxide MO which becomes inert on heating. It forms insoluble hydroxide which is soluble in NaOH. The metal M is
  A)
  Mg                    done clear
  B)
  Ba done clear
  C)
  Ca                   done clear
  D)
  Be done clear
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• question_answer20)
  The compound sprinkled on road to keep them wet and prevent dust form flying is
  A)
  Calcium hydroxide          done clear
  B)
   Calcium chloride done clear
  C)
   Calcium sulphate           done clear
  D)
   Calcium hydride done clear
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• question_answer21)
  The total number of alkali metals (non-radioactive) which produce superoxide when burn with excess of \[{{O}_{2}}\] is
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• question_answer22)
  Mole(s) of hydrocarbon produced by hydrolysis of 1 mole \[M{{g}_{2}}{{C}_{3}}\](magnesium carbide) is/are
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• question_answer23)
  What is the oxidation number of metal in \[Ba{{O}_{2}}\]?
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• question_answer24)
  \[N{{a}_{2}}{{O}_{2}}\]is a strong oxidizing agent. It oxidises chromic compounds into chromates. How many moles of \[N{{a}_{2}}{{O}_{2}}\]are required to convert two moles of cr\[{{(OH)}_{3}}\]into sodium chromate?
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• question_answer25)
  What is the number of chlorides in the given list which dissolve in excess of NaOH solution? \[SnC{{l}_{2}};AIC{{l}_{3}},FeC{{l}_{3}},ZnC{{l}_{2}},BeC{{l}_{2}},AgC\]
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