CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 7 - MCQExams.com

Which mineral is neccessary for blood clotting?
  • Calcium
  • Magnese
  • Phosphorus
  • Iron
The activity of alkaline earth metals as reducing agent :
  • decreases from $$Be$$ to $$Ba$$
  • increases from $$Be$$ to $$Ba$$
  • increases from $$Be$$ to $$Ca$$ and decreases from $$Ca$$ to $$Ba$$
  • decreases from $$Be$$ to $$Ca$$ and increases from $$Ca$$ to $$Ba$$
Which one of the following alkali metals gives hydrated salts?
  • $$Li$$
  • $$Na$$
  • $$K$$
  • $$Cs$$
Which sequence of reactions shows correct chemical relation between sodium and its compounds?
  • $$Na+O_{2}\longrightarrow Na_{2}O\xrightarrow {HCl(aq)}NaCl\xrightarrow {\quad co_{2}\quad}Na_{2}CO_{3}\xrightarrow {\quad \Delta \quad}Na$$
  • $$Na\xrightarrow {\quad o_{2}\quad}Na_{2}O\xrightarrow {\quad H_{2}O\quad}NaOH\xrightarrow{\quad co_{2}\quad}Na_{2}CO_{3}\xrightarrow {\quad \Delta \quad}Na$$
  • $$Na+H_{2}O\longrightarrow NaOH\xrightarrow {\quad HCl\quad }NaCl\xrightarrow {\quad co_{2}\quad}Na_{2}CO_{3}\xrightarrow {\quad \Delta\quad }Na$$
  • $$Na+H_{2}O\longrightarrow NaOH\xrightarrow {\quad co_{2}\quad}Na_{2}CO_{3}\xrightarrow {\quad HCl\quad } \underset{(molten)}{NaCl}\xrightarrow{Electrolysis}Na$$
Which of the following alkali metal ions has lowest ionic mobility in aqueous solution?
  • $$Rb^+$$
  • $$Ca^+$$
  • $$Na^+$$
  • $$Li^+$$
Thermal stability of $$BaCO_3, CaCO_3$$ and $$MgCO_3$$ is:
  • $$BaCO_3 > CaCO_3 > MgCO_3$$
  • $$BaCO_3 > MgCO_3 > CaCO_3$$
  • $$CaCO_3 > MgCO_3 > BaCO_3$$
  • $$MgCO_3 > CaCO_3 > BaCO_3$$
The element that does NOT form acidic oxide is :
  • carbon
  • phosphorus
  • chlorine
  • barium
For the alkali metals, which of the following increases atomic number ?
  • First ionization energy
  • Electronegativity
  • Hydration energy of the univalent ion
  • Atomic radius
A holoenzyme contains apoenzyme and ____________ .
  • isoenzyme
  • cofactor
  • inhibitor
  • none of the above
$${Li}_{2}{SO}_{4}$$ is not isomorphous with sodium sulphate, due to:
  • small size of lithium
  • high coordination number of lithium
  • high ionization energy of lithium
  • none of the above
The alkaline earth metal with the least density value is:
  • $$Mg$$
  • $$Be$$
  • $$Sr$$
  • $$Ca$$
  • $$Ba$$
Among the following the least thermally stable is:
  • $$K_{2}CO_{3}$$
  • $$Na_{2}CO_{3}$$
  • $$BaCO_{3}$$
  • $$Li_{2}CO_{3}$$
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
  • $$SrSO_4$$
  • $$CaSO_4$$
  • $$BeSO_4$$
  • $$BaSO_4$$
The set representing the correct order of ionic radii is:
  • $${ Li }^{ + }>{ Be }^{ 2+ }>{ Na }^{ + }>{ Mg }^{ 2+ }$$
  • $${ Na }^{ + }>{ Li }^{ + }>{ Mg }^{ 2+ }>{ Be }^{ 2+ }$$
  • $${ Li }^{ 2+ }>{ Na }^{ + }>{ Mg }^{ 2+ }>{ Be }^{ 2+ }$$
  • $${ Mg }^{ 2+ }>{ Be }^{ 2+ }>{ Li }^{ + }>{ Na }^{ + }$$
Diagonal relationship is not shown by:
  • $$Li$$ and $$Mg$$
  • $$Be$$ and $$Al$$
  • $$B$$ and $$Si$$
  • $$C$$ and $$N$$
Which of the following is a false statement?
  • Sodium oxide is more basic then magnesium oxide
  • Beryllium oxide is amphoteric.
  • The thermal stability of beryllium carbonate is more than that of calcium carbonate
  • Lithium chloride is deliquescent.
Which alkaline earth metal compound is volatile?
  • $$Mg_{3}N_{2}$$
  • $$Ca_{3}N_{2}$$
  • $$Be_{3}N_{2}$$
  • None of the option
Which of the following substances are formed when lithium is heated in air?
  • $${ Li }_{ 2 }O+Li{ O }_{ 2 }$$
  • $${ Li }_{ 2 }{ O }_{ 2 }$$
  • $$Li{ O }_{ 2 }$$
  • $$Li_2{ O }_{  }+{ Li }_{ 3 }N\quad $$
Choose the correct answer form the alternatives given.
Which of the following has lowest thermal stability?
  • $$Li_2CO_3$$
  • $$Na_2CO_3$$
  • $$K_2CO_3$$
  • $$Rb_2CO_3$$
Choose the correct answer form the alternatives given.
A solution of a compound $$X$$ in dilute $$HCl$$ on treatment with a solution of $$BaCl_2$$ gives a white precipitate of compound $$Y$$ which is insoluble in conc. $$HNO_3$$ and conc. $$HCl$$. Compound $$X$$ imparts golden yellow colour to the flame.
$$\underset{(\text{imparts golden yellow colour})}{X (\text{solution in dilute HCl})}+BaCl_2\longrightarrow \underset{white \\ ppt}{Y}  \xrightarrow[Conc Hcl]{Conc.HNO_3\\ +} Insoluble$$
What are compounds $$X$$ and $$Y$$?
  • $$X$$ is $$MgCl_2$$ and $$Y$$ is $$BaSO_4$$
  • $$X$$ is $$CaCl_2$$ and $$Y$$ is $$BaSO_4$$
  • $$X$$ is $$Na_2SO_4$$ and $$Y$$ is $$BaSO_4$$
  • $$X$$ is $$MgSO_4$$ and $$Y$$ is $$BaSO_4$$
Choose the correct answer form the alternatives given.
Which of the following statements is not true about alkali metals ?
  • All alkali metals from oxo salts such as carbonates, sulphates and nitrates.
  • The basic character of oxides increases down the group.
  • Carbonates and sulphates of lithium are stable and their stability decreases down the group.
  • Solubility of carbonates and sulphates increases down the group.
The properties of $$Li$$ are similar to those of $$Mg$$. This is because:
  • both have nearly the same size.
  • both has their charge to size ratio nearly the same.
  • both have similar electronic configurations.
  • both are found together in nature.
For a given sample of water containing the following impurities
$$Mg{ \left( H{ CO }_{ 3 } \right)  }_{ 2 }=73mg/L;\quad Ca{ \left( H{ CO }_{ 3 } \right)  }_{ 2 }=162mg/L;\quad Ca{ SO }_{ 4 }=136mg/L$$
$$Mg{ Cl }_{ 2 }=95mg/L;\quad Ca{ Cl }_{ 2 }=111mg/L;\quad NaCl=100mg/L$$
Then the total hardness (temporary and permanent) of above water sample is?
  • $$300ppm$$
  • $$350ppm$$
  • $$450ppm$$
  • $$500ppm$$
Which one of the following will not give flame test?
  • $$Ca$$
  • $$Ba$$
  • $$Sr$$
  • $$Be$$
Magnesium cation has polarising power close to that of:
  • $$Li^{+} $$
  • $$Na^{+} $$
  • $$K^{+} $$
  • $$Cs^{+} $$
The increasing order of the density of alkali metals :
  • Li < K < Na < Rb < Cs
  • Li < Na < K < Rb < Cs
  • Cs < Rb < Na < K < Li
  • Cs < Rb < K < Na < Li
  • Li < Na < Rb < K < Cs
Which of the following alkali metals when burnt in air forms a mixture of oxide as well as nitride?
  • K
  • Na
  • Li
  • Cs
The first element of the groups 1 and 2 are different from other members of the respective groups. Their behaviour is more similar to the second element of the following groups. What is this relationship known as?
  • Anomalous relationship
  • Periodic relationship
  • Diagonal relationship
  • Chemical relationship
Which of the following oxides is most acidic in nature?
  • $$BaO$$
  • $$MgO$$
  • $$CaO$$
  • $$BeO$$
The pair of amphoteric oxides is:
  • $$BeO, ZnO$$
  • $$Al_2O_3,Li_2O$$
  • $$BeO, BO_3$$
  • $$BeO, MgO$$
Lithium salts are mostly hydrated like $$ LiCl.2H_2O $$ due to:
  • maximum ionisation enthalpy
  • maximum degree of hydration of $$Li^+$$
  • maximum hydroscopic nature
  • maximum chemical reactivity.
Which nitrate will decompose to give $$NO_2$$ on heating?
  • $$NaNO_3$$
  • $$KNO_3$$
  • $$RbNO_3$$
  • $$LiNO_3$$
Which of the following is not the point of difference between Be and other alkaline earth metals? 
  • It has a tendency to form covalent bonds.
  • It dissolves in alkalies with evolution of hydrogen.
  • Its oxides and hydroxides are amphoteric.
  • Its carbide gives acetylene on hydrolysis
The decreasing order of the second ionization potential of $$Mg,\ Ca$$ and $$Ba$$ is:
  • $$Mg > Ca > Ba$$
  • $$Ca > Ba > Mg$$
  • $$Ba > Mg > Ca$$
  • $$Mg > Ba > Ca$$
Which among the following is kinetically inert towards water? 
  • Na
  • Be
  • Ca
  • K
Which of the following does not show diagonal relationship between beryllium and aluminium? 
  • Both $$BeO$$ and $$Al_2O_3$$ are amphoteric in nature.
  • Both beryllium and aluminium form polymetric covalent hydrdes.
  • Both beryllium and aluminium form nitrides with nitrogen which evolve $$NH_3$$ with water.
  • Both metal carbonates are highly stable.
Which of the following does not show the anomalous behaviour of Lithium?
  • Lithium reacts with nitrogen to form a nitride
  • Lithium carbonate decomposes on heating
  • Lithium nitrate gives $$NO_2$$ on heating
  • Lithium is the strongest reducing agent
Which is the correct sequence of solubility of carbonates of alkaline earth metals?
  • $$BaCO_3 > SrCO_3 > CaCO_3 > MgCO_3$$
  • $$MgCO_3 > CaCO_3 > SrCO_3 > BaCO_3$$
  • $$CaCO_3 > BaCO_3 > SrCO_3 > MgCO_3$$
  • $$BaCO_3 > CaCO_3 > SrCO_3 > MgCO_3$$
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 _________.
  • more, do not decompose, soluble, hygroscopic, hydrates
  • less, decompose, soluble, deliquescent, hydrates
  • freely, sublime, insoluble, deliquescent, anhydrous
  • freely, decompose, soluble, hygroscopic, crystals
The metal ions (charged particles) that are required for contraction of muscles in human beings and animals are ions of:
  • calcium
  • sodium
  • potassium
  • iron
Which of the following compounds is formed when sodium burns in excess supply of air ?
  • Sodium suboxide
  • Sodium oxide
  • Sodium peroxide
  • Sodium superoxide
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.
  • Haemoglobin
  • Casein
  • Keratin
  • Interferon
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?
  • Be
  • Ba
  • Ca
  • Mg
The violet flame shown by potassium in Bunsen flame is due to jumping of the electron from :
  • 1s to 4p
  • 1s to 5p
  • 4p to 4s
  • 5p to 4s
Which of the following metals is required as a cofactor by all enzymes utilizing ATP in phosphate transfer?
  • K
  • Ca
  • Na
  • Mg
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?
  • Calcium
  • Magnesium
  • Beryllium
  • Aluminium
Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
  • $$Li$$
  • $$Na$$
  • $$K$$
  • $$Cs$$
Dehydration of hydrates of halides of calcium, barium and strontium i.e., $$CaCl_2.6H_2O,BaCl_2.2H_2O,SrCl_2.2H_2O$$ can be achieved by heating. These become wet on keeping in the air. Which of the following statements is correct about these halides?
  • The act as dehydrating agents.
  • They can absorb moisture from air.
  • They have tendency to from hydrate which decreases from calcium to barium.
  • All of the above
Which of the following is not a similarity of beryllium with aluminium? 
  • It becomes passive when treated with conc.$$HNO_3$$.
  • It forms polymeric covalent hydrides.
  • Carbonate of Be is extremely stable.
  • Salts of Be do not impart colour to the flame.
Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?
  • $$MgCO_3$$
  • $$CaCO_3$$
  • $$SrCO_3$$
  • $$BaCO_3$$
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