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31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - NEET MCQ


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38 Questions MCQ Test Chemistry Class 11 - 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT)

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) for NEET 2024 is part of Chemistry Class 11 preparation. The 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) below.
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31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 1

Which one of the following properties of alkali metals increases in magnitude as the atomic number rises ? [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 1

Within a group, ionic radius increases with increase in atomic number. The melting points decrease down the group due to weakning of metallic bond. The electronegativity and the 1st ionization energy also decreases down the group.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 2

Wh ich of the following atoms will have the smallest size ? [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 2

Within a period, the atomic size decreases from left to right.Further atomic size increases down the group. Hence the correct order is   i,e. Na > Mg > Li > Be.

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31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 3

Compared with the alkaline earth metals, the alkali metals exhibit [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 3

Because of larger size and smaller nuclear charge, alkali metals have low ionization potential relative to alkaline earth metals.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 4

Washing soda has formula [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 4

Washing soda is Na2 CO3. 10 H2O.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 5

Electronic configuration of calcium atom may be written as [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 5

Ca(20) = 1s22s23p6 3s23p6 4s2 = [Ar] 4s2

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 6

Which of the following will react most vigorously with water

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 6

Out of Li, Na, K and Rb, Rb reacts fastest with water. The rate of reaction increases down the group.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 7

Which one of the following has minimum value of cation/anion ratio. [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 7

Atomic size of K+ > Ca2+ > Mg2+ and that of Cl > F. Therefore, Mg2+/Cl ratio has the minimum value.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 8

Which of the following has largest size ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 8

A cation is always much smaller than the corresponding atom(with increase in positive charge, atomic particles move close to each other), whereas an anion is always larger than the corresponding atom(with increase in negative charge, size increases to minimise the effect of steric repulsion). 

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 9

Which of the following is known as fusion mixture? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 9

Mixture of K2CO3 and Na2CO3 is called fusion mixture

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 10

 All the following substances react with water.The pair that gives the same gaseous product is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 10

Ca and CaH2 both react with H2O to form H2 gas,

whereas K gives H2 while KO2 gives O2 and H2O2

Similarly, Na gives H2 while Na2 O2 gives
H2O2

Likewise Ba gives H2 while BaO2 gives H2O2

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 11

Among the following oxides, the one which is most basic is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 11

MgO. N2O5 is strongly acidic, ZnO and Al2 O3 are amphoteric, therefore, MgO is most basic.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 12

Which of the following metal ions plays an important role in muscle contraction ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 12

Ca2+ ions is an essential element for the contraction of muscles.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 13

Which of the following statement is false ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 13

Be(OH)2 is amphoteric, but the hydroxides of other alkaline earth metals are basic. The basic strength increases gradually.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 14

Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% CaCl2 because [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 14

Sodium is obtained by electrolytic reduction of its chloride. Melting point of chloride of sodium is high (803°C) so in order to lower its melting point(600°C), calcium chloride is added to it.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 15

 Identify the correct statement [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 15

Gypsum is CaSO4. 2H2O and plaster of Paris i s (CaSO4)2 .H2O. Therefore gypsum contains a lower percentage of calcium than plaster of Paris.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 16

Aqueous solution of sodium carbonate absorbs NO and NO2 to give [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 16

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 17

Which one is the correct statement with reference to solubility of MgSO4 in water? [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 17

MgSO4 is the only alkaline ear th metal sulphate which is soluble in water and for solubility hydration energy should be greater than lattice energy i.e hydration energy > lattice energy

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 18

Calcium is obtained by the [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 18

Calcium is obtained by electrolysis of a fused mass consisting six parts calcium chloride and one part calcium fluoride at about 700°C in an electrolytic cell.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 19

In crystals of which one of the following ionic compounds would you expect maximum distance between centres of cations and anions? [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 19

As Cs+ ion has larger size than Li+ and I has larger size than F, therefore maximum distance between centres of cations and anions is in CsI.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 20

In which of the following processes, fused sodium hydroxide is electrolysed at a 330ºC temperature for extraction of sodium? [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 20

In Castner process, for production of (Na) Sodium metal, Sodium hydroxide (NaOH) is electrolysed at temperature 330ºC.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 21

A solid compound ‘X’ on heating gives CO2 gas and a residue. The residue mixed with water forms ‘Y’. On passing an excess of CO2 through ‘Y’ in water, a clear solution ‘Z’, is obtained. On boiling ‘Z’, a compound ‘X’ is reformed. The compound ‘X’ is[2004]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 21

The given properties coincide with CaCO3

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 22

The correct order of the mobility of the alkali metal ions in aqueous solutions is [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 22

Hydration enthalpies of alkali metal ions decreases with the increase in ionic radii as we move down the group.

Therefore, smaller is the mass of hydrated species higher is the ionic mobility in the aqueous solution.

Thus, the order for ionic mobility of ions is

Rb+ > K+ > Na+ > Li+

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 23

The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is[2007]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 23

As the basicity of metal hydroxides increases down the group from Be to Ba, the thermal stability of their carbonates also increases in the same order. Further group 1 compounds are more thermally stable than group 2 because their hydroxide are much basic than group 2 hydroxides therefore, the order of thermal stability is BeCO3 < MgCO3< CaCO3< K2CO3.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 24

In which of the following the hydration energy is higher than the lattice energy? [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 24

The solubility of sulphates of alkaline earth metals decreases as we move down the group from Be to Ba due to the reason that ionic size increases down the group. The lattice energy remains constant because sulphate  ion is so large, so that small change in cationic sizes do not make any difference.
Thus the order:

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 25

The sequence of ioinic mobility in aqueous solution is : [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 25

Smaller the ion more is its ionic mobility in aqueous solution. Ionic radii of the given alkali metals is in the order Na+ < K+ < Rb+ < Cs+ and thus expected ionic mobility will be in the order Cs+ < Rb+ < K+ < Na+. However due to high degree of solvation (or hydration) because of lower size or high charge density, the hydrated ion size follows the order Cs+ < Rb+ < K+ < Na+ and thus conductivity order is Cs> Rb+ > K+ > Na+ i.e. option (b) is correct answer.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 26

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders ? [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 26

The stability of alkali metal hydrides decreases from Li to Cs. It is due to the  fact that M–H bonds becomes weaker with increase in size of alkali metals as we move down the group from Li to Cs. Thus the order of stability of hydrides is LiH > NaH > KH > RbH > CsH i.e. option (d) is correct answer.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 27

Which of the following oxides is not expected to react with sodium hydroxide? [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 27

NaOH is a strong alkali. It combines with acidic and amphoteric oxides to form salts.
Since CaO is a basic oxide hence does not reacts with NaOH.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 28

Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 28

Be2+ is very small, hence its hydration enthalpy is greater than its lattice enthalpy (At. Nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 29

Property of the alkaline earth metals that increases with their atomic number : [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 29

Lattice energy decreases more rapidly than hydration energy for alkaline earth metal hydroxides.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 30

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound is [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 30

∴ Correct choice : (b)

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 31

Which of the following compounds has the lowest melting point ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 31

Melting points of halides decreases as the size of the halogen increases. The correct order is CaF2 > CaCl2 > CaBr2 > CaI2

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 32

Which one of the following is present as an active ingredient in bleaching powder for bleaching action ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 32

Active ingredient in bleaching powder for bleaching action is Ca (OCl)2

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 33

Which of the following statements is incorrect ? [2011M]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 33

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 34

Match List – I with List –II for the compositions of substances and select the correct answer using the code given below the lists : [2011M]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 34

(A) Plaster of paris = 

(B) Epsomite = MgSO4.7H2O
(C) Kieserite = MgSO4.H2O
(D) Gypsum = CaSO4.2H2O

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 35

Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 35

All the alkali metals when heated with oxygen form different types of oxides for example lithium forms lithium oxide (Li2O), sodium forms sodium peroxide (Na2O2), while K, Rb and Cs form their respective superoxides.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 36

 The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order :[2012]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 36

All a lkali  metal salts are ionic (except Lithium) and soluble  in water due to the fact that cations get hydrated by water molecules. The  degree of hydration depends upon the size of the cation. Smaller the size of a cation, greater is its hydration energy.
Relative ionic radii :

Relative ionic radii in water or relative degree of hydration:

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 37

In the replacement reaction

The reaction will be most favourable if M happens to be : [2012 M]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 37

Tertiary halide can show ionic reaction with MF so, MF should be most ionic for reaction to proceed forward. Hence ‘M’ should be ‘Rb’.

31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 38

In Castner-Kellner cell for production of sodium hydroxide: [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: The s-Block Elements (Old NCERT) - Question 38

At the cathode, since the discharge + ions is lower than that of H+ ions on the mercury, cathode, so Na+ ions are discharged while H+ ions remain in the solution.

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