Consider the following ionization enthalpies of two elements 'A' and 'B'. Element Ionization enthalphy kJ / mol 1 st 2 nd 3 rd A 899 1757 14847 B 737 1450 7731 Which of the following statements is correct?

Both 'A' and 'B' belong to group-2 where 'B' comes below 'A'.

Both 'A' and 'B' belong to group-1 where 'A' comes below 'B'.

Both 'A' and 'B' belong to group-2 where 'A' comes below 'B'.

Both 'A' and 'B' belong to group-1 where 'B' comes below 'A'.

Match List - I with List - II List - I List - II (a) Ca ( OCl ) 2 (i) Antacid (b) CaSO 4 · 1 2 H 2 O (ii) Cement (c) CaO (iii) Bleach (d) CaCO 3 (iv) Plaster of paris Choose the most appropriate answer from the

a − iii , b − iv , c − ii , d − i

a − i , b − iv , c − iii , d − ii

a − iii , b − ii , c − iv , d − i

a - iii , b − ii , c - i , d - iv

Name the following element: An alkaline earth metal present in group 2 and period 3 .

An alkaline earth metal that is present in group two has valency 2 , and as it is present in period third it has three shells in its atom. Its electronic configuration is 2 , 8 , 2 , hence its atomic number is 12 . The metal is magnesium.

Match list-I with list-II : (a) Be (i) Treatment of cancer (b) Mg (ii) Extraction of metals (c) Ca (iii) Incendiary bombs and signals (d) Ra (iv) Windows of X-ray tubes (v) Bearings for motor engines. Choose the most appropriate answer, the option given below :

a - iv , b - iii , c - ii , d - i

a - iv , b - iii , c - i , d - ii

a - iii , b - iv , c - v , d - ii

a - iii , b - iv , c - ii , d - v

Match Column I with Column II Column I Column II A Soda ash I CaSO 4 B Chlorophyll II Ca OH 2 C Used in Whitewashing III Na 2 CO 3 D Dentistry, ornamental work IV Mg 2 + ions

A – III, B – IV, C – I, D – II

A – II, B – I, C – III, D – IV

A – III, B – I, C – II, D – IV

A – II, B – III, C – IV, D – I

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Calcium is obtained by

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Important Questions on The s-Block Elements

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Consider the following ionization enthalpies of two elements 'A' and 'B'.

Element	Ionization enthalphy $(kJ / mol)$
	$1^{st}$	$2^{nd}$	$3^{rd}$
A	899	1757	14847
B	737	1450	7731

Which of the following statements is correct?

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

The alkaline earth metal nitrate that does not crystallise with molecules is:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Match List $- I$ with List $- II$

	List $- I$		List $- II$
(a)	$Ca (OCl)_{2}$	(i)	Antacid
(b)	${CaSO}_{4} \cdot \frac{1}{2} H_{2} O$	(ii)	Cement
(c)	$CaO$	(iii)	Bleach
(d)	${CaCO}_{3}$	(iv)	Plaster of paris

Choose the most appropriate answer from the

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Give a reason for the following.

Alkali metals are good reducing agents.

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Magnesium powder burns in air to give

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Name the following element:

An alkaline earth metal present in group $2$ and period $3$ .

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Match list-I with list-II :


(a)	$Be$	(i)	Treatment of cancer
(b)	$Mg$	(ii)	Extraction of metals
(c)	$Ca$	(iii)	Incendiary bombs and signals
(d)	$Ra$	(iv)	Windows of X-ray tubes
		(v)	Bearings for motor engines.

Choose the most appropriate answer, the option given below :

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : The energy required to form ${Mg}^{2 +}$ from $Mg$ is much higher than that required to produce ${Mg}^{+}$

Reason R: ${Mg}^{2 +}$ is small ion and carry more charge than ${Mg}^{+}$

In the light of the above statements, choose the correct answer from the options given below.

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

The pair of

s

-

block metals, which gives crimson colour to the flame is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Magnesium is burnt in the air to form

A

and

B

. When

B

is hydrolyzed,

C

and

D

are formed.

D

is the reactant in the manufacture of nitric acid by Ostwald's process. What is

C

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Which of the following metal is the most abundant in the earth's crust?

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

The alkaline earth metal sulphate, which has its hydration enthalpy greater than its lattice energy is

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Match Column I with Column II

	Column I		Column II
A	Soda ash	I	${CaSO}_{4}$
B	Chlorophyll	II	$Ca {(OH)}_{2}$
C	Used in Whitewashing	III	${Na}_{2} {CO}_{3}$
D	Dentistry, ornamental work	IV	${Mg}^{2 +}$ ions

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Which one of the following oxide dissolves in both hydrochloric acid and sodium hydroxide?

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

A metal

' M'

readily gives

{MSO}_{4},

which is soluble in water. It forms its oxide

M 0

which is amphoteric. It forms an insoluble hydroxide

M (OH)_{2},

which is soluble in

NaOH

solution. The

M

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Given below are two statements: One is labelled as
Assertion $A$ and the other is labelled as Reason $R$
Assertion $A$ : Sodium is about $30$ times as abundant as potassium in the oceans.
Reason $R$ : Potassium is bigger in size than sodium.
In the light of the above statements, choose the correct answer from the options given below

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

The element whose salts cannot be detected by flame test is.

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

s-block element which cannot be qualitatively confirmed by the flame test is

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Valence shell electronic configuration of fourth element of group-

2

in periodic table is

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Chemistry>Inorganic Chemistry>The s-Block Elements>General Introduction of Group 2 Elements

Alkali and alkaline earth metals along with hydrogen and helium constitute s-block elements. They have low ionization enthalpies and hence exhibit characteristic flame coloration. They have highly negative electrode potentials and hence are strong reducing agents. Their solutions in liquid ammonia are conducting and also act as strong reducing agents. Being stronger reducing agents than hydrogen, they are usually prepared by electrolysis of their fused chlorides. Their oxides are basic and the basic strength increases down the group. The solubility of carbonates and sulphates of alkali and alkaline earth metals show opposite trends. The carbonates of alkaline earth metals and lithium carbonate decompose on heating while the carbonates of other alkali metals do not decompose on heating The bicarbonates of both alkali and alkaline earth metals on heating give carbonates.

The element that produces red-violet colour in the non-luminous flame is

Calcium is obtained by

Important Questions on The s-Block Elements

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