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'.

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 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

Name the following element: A trivalent metal used to make light tools.

Trivalent metals are placed in group thirteen. These metals have three electrons that can be given off to attain stability. Aluminium is the trivalent metals that has low density and is used to make light tools. Duralumin an alloy of aluminium and copper is lightweight and strong enough to make the body of the aircraft.

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

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Important Questions on The s-Block Elements

MEDIUM

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?

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 $3$ .

MEDIUM

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

H_{3} {PO}_{2}

and

H_{3} {PO}_{3}

, the numbers of

P - H

bonds are, respectively,

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?

MEDIUM

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

The indicator used during the estimation of

COD

of a water sample is

MEDIUM

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.

MEDIUM

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

Give a reason for the following:

Inert gases do not form ions.

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

MEDIUM

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

Which statements about Boron and its compounds, among the following are true?
(i) Boron has high density and good electrical conductivity.
(ii)

{}^{10}B

isotope metal borides are useful as protective shields in nuclear industry.
(iii) Borax and boric acid are used in the manufacture of glasses.
(iv) Orthoboric acid is toxic and hence not useful in antiseptic solutions.

HARD

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

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.

Element	Atomic number
$P$	$13$
$Q$	$7$
$R$	$10$

Which element has an electron affinity zero?

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

MEDIUM

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

MEDIUM

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.

MEDIUM

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?

HARD

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

Name the following element:

A trivalent metal used to make light tools.

MEDIUM

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

Consider the following radioactive decays

I. ${}_{92}U {\overset{- α}{⟶}}_{90} Th$ and

II. $_{90} Th \overset{- α}{⟶} {}_{88}{Ra}$

In which case group of parent and daughter elements remains unchanged.

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

HARD

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

Which one of the following represents the composition of carnallite mineral?

EASY

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

The set representing the correct order of first ionisation potential is

MEDIUM

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

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

Important Questions on The s-Block Elements

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