Match the elements given in Column I with the properties mentioned in Column II. Column I Column II (a) Li (p) Insoluble sulphate (b) Na (q) Strongest monoacidic base (c) Ca (r) Most negative E ⊝ value among alkali metals (d) Ba (s) Insoluble oxalate (t) 6 s 2 outer electronic configuration

(a) Li – Most negative E ° among alkali metals Due to very high hydration energy, the resulting E ° is most negative. (b) Na – Strongest monoacidic base Alkalies are more acidic than alkaline earth metals. LiOH has a covalent character. (c) Ca – insoluble oxalate Calcium oxalate is insoluble in water. (d) Ba – Insoluble sulphate Hydration energy decreases as the size of cation increases. - 6 s 2 outer electronic configuration 56 - Ba = Is 2 , 2 s 2 2 p 6 , 3 s 2 3 p 6 3 d 10 , 4 s 2 4 p 6 4 d 10 , 5 s 2 5 p 6 , 6 s 2 Column I Column II (a) Li (r) Most negative E 0 value among alkali metals (b) Na (q) Strongest monoacidic base (c) Ca (s) Insoluble oxalate (d) Ba (p) (t) Insoluble sulphate 6 s 2 outer electronic configuration

Match the compounds given in Column I with their uses mentioned in Column II. Column I Column II (a) CaCO 3 (p) Dentistry, ornamental work (b) Ca ( OH ) 2 (q) Manufacture of sodium carbonate from caustic soda (c) CaO (r) Manufacture of high-quality paper (d) CaSO 4 (s) Used in whitewashing

(a) CaCO 3 – Manufacture of high-quality paper It is added to the papermaking furnish to increase brightness and opacity. (b) Ca ( OH ) 2 – Used in whitewashing When we white-wash the walls, then first calcium oxide (oxide) is made to react with water to form calcium hydroxide. The calcium hydroxide is then applied to the walls, which slowly reacts with the carbon dioxide gas present in the air to form a thin shining layer on the walls. (c) CaO – Manufacture of sodium carbonate from caustic soda (d) CaSO 4 – Dentistry, ornamental work It has been used in bone regeneration as a graft material and graft binder/extender and as a barrier in guided tissue regeneration (a → r); (b→s); (c → q); (d→p) Column I Column II (a) CaCO 3 (r) Manufacture of high-quality paper (b) Ca ( OH ) 2 (s) Used in whitewashing (c) CaO (q) Manufacture of sodium carbonate from caustic soda (d) CaSO 4 (p) Dentistry, ornamental work

Match the elements given in Column I with the colour they impart to the flame given in Column II. Column I Column II (a) Cs (p) Apple green (b) Na (q) Violet (c) K (r) Brick red (d) Ca (s) Yellow (e) Sr (t) Crimson red (f) Ba (u) Blue

Elements with the characteristic flame colour are as follows ‘ (a) Cs -Blue (b) Na -Yellow (c) K -Violet (d) Ca -Brick red (e) Sr -Crimson red (f) Ba -Apple green Flame colours are produced from the movement of the electrons in the metal ions present in the compounds. These movements of electrons (electronic excitation and de-excitation) requires energy. Each atom has a particular energy gap between the ground and the excited energy level. Therefore, each of these movements involves a specific amount of energy emitted as light energy, and each corresponds to a particular colour. As we know the energy gap between the ground and excited-state energy level increases, the wavelength of light absorbed decreases and the complementary colour is observed. Column I Column II (a) Cs (u) Blue (b) Na (s) Yellow (c) K (p) Violet (d) Ca (r) Brick red (e) Sr (t) Crimson red (f) Ba (p) Apple green

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11th CBSE

IMPORTANT

Earn 100

Write Lewis structure of $O_{2}^{-}$ ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?

Important Questions on The s-Block Elements

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Short Answer Type>Q 39

Why do beryllium and magnesium not impart colour to the flame in the flame test?

HARD

11th CBSE

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NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Short Answer Type>Q 40

What is the structure of

{BeCl}_{2}

molecule in gaseous and solid state?

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IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Matching Type>Q 41

Match the elements given in Column I with the properties mentioned in Column II.

	Column I		Column II
(a)	$Li$	(p)	Insoluble sulphate
(b)	$Na$	(q)	Strongest monoacidic base
(c)	$Ca$	(r)	Most negative $E^{⊝}$ value among alkali metals
(d)	$Ba$	(s)	Insoluble oxalate
		(t)	$6 s^{2}$ outer electronic configuration

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Matching Type>Q 42

Match the compounds given in Column I with their uses mentioned in Column II.

	Column I		Column II
(a)	${CaCO}_{3}$	(p)	Dentistry, ornamental work
(b)	$Ca (OH)_{2}$	(q)	Manufacture of sodium carbonate from caustic soda
(c)	$CaO$	(r)	Manufacture of high-quality paper
(d)	${CaSO}_{4}$	(s)	Used in whitewashing

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Matching Type>Q 43

Match the elements given in Column I with the colour they impart to the flame given in Column II.

	Column I		Column II
(a)	$Cs$	(p)	Apple green
(b)	$Na$	(q)	Violet
(c)	$K$	(r)	Brick red
(d)	$Ca$	(s)	Yellow
(e)	$Sr$	(t)	Crimson red
(f)	$Ba$	(u)	Blue

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Long Answer Type>Q 46

The

s

-block elements are characterised by their larger atomic sizes, lower ionisation enthalpies, invariable

+ 1

oxidation state and solubilities of their oxosalts. In the light of these features describe the nature of their oxides, halides and oxosalts.

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IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Long Answer Type>Q 47

Present a comparative account of the alkali and alkaline earth metals with respect to the tendency to form ionic/covalent compounds

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11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 10 - The s-Block Elements>Long Answer Type>Q 47

Present a comparative account of the alkali and alkaline earth metals with respect to the nature of oxides and their solubility in water.

Write Lewis structure of O2- ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?

Important Questions on The s-Block Elements

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Write Lewis structure of $O_{2}^{-}$ ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?