Chemistry s-Block Elements MCQs Chapter 2 Class 12 - PLS Academy

Chemistry s-Block Elements MCQs – Chapter 2 Class 12

Chemistry s-Block Elements is an important chapter of Class 12 Chemistry and plays a significant role in FSc Part-II exams and entry test preparation. MCQs from this chapter are frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and board examinations. This chapter covers key topics such as the group 1 (alkali metals) and group 2 (alkaline earth metals), their electronic configuration, general properties, reactions with water and oxygen, and trends in physical and chemical properties.

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Created on February 10, 2022 By Ali Durrani

Chemistry Ch 2 Class 12 s and p Block Elements

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1 / 68

Commercial hydrogen is obtained from:

NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
Elimination Tool:

A) coal gas

B) oil gas

C) marsh gas

D) producer gas

2 / 68

The flame colour of Ca in flame test is:

NUMS 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) Orange red

B) Golden yellow

C) Red

D) Pink

3 / 68

Which of the following do not occur in Free State?

Both

None of these

4 / 68

Formula of Epsom salt is:

5 / 68

Which ions shall be removed to make hard water soft?

NUMS 2019 Cancelled
Chemistry
s and p Block Elements
Elimination Tool:

A) Ca+2and SO42-

B) Ca2+and Mg2+

C) SO42-and Cl-

D) HCO3-and SO42-

6 / 68

Which of the following compounds is formed when sodium burns in excess of air?

NTS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Na2O

B) Na2O3

C) Na2O2

D) NaO2

7 / 68

The lower part of the “Solvay tower” has been cooled during the manufacture of soda ash because:

NTS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) this facilitates the production of soda ash

B) it decreases the solubility of Na2CO3

C) this controls the flow of brine

D) it decreases the solubility of NaHCO3

8 / 68

Hydrides which are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals are called:

NTS 2011
Chemistry
s and p Block Elements
Elimination Tool:

A) Covalent hydrides

B) Ionic hydrides

C) Complex hydrides

D) Metallic hydrides

9 / 68

By heating 25g of limestone (CaCO3) , the weight of carbon dioxide produced is

NTS 2011
Chemistry
s and p Block Elements
Elimination Tool:

A) 14 g

B) 71 g

C) 11 g

D) 2 g

10 / 68

Which of the following is not true about caustic soda? a) It causes painful burns c) It is manufactured by Costner—Kellner process e) Both b and d

) It causes painful burns

It is manufactured by Costner—Kellner process

Both b and d

b) It has purgative smell

d) It is used os on anti-acid

11 / 68

Magnesiums keep on burning in:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) CO2

B) Magnesium and Copper

C) N2O

D) N2 as well as CO2

12 / 68

Which one of the following statements is true?

NUMS 2016
Chemistry
s and p Block Elements
Elimination Tool:

A) All nitrates of Group II metals are decomposed by heat to give the oxide NO2.

B) Aqueous sodium nitrate in acidic to litmus.

C) Aqueous ammonium nitrate is alkaline to litmus.

D) The alkali metal nitrates are insoluble in water.

13 / 68

Chlorine upon reaction in cold NaOH yields:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) NaCl, NaClO, H2O

B) NaCl , NaClO3 , H2O

C) NaClO , NaClO3, H2O

D) NaCl , H2O

14 / 68

Nascent hydrogen used in the formation of methane is obtained from the reaction of:

NTS 2010
Chemistry
s and p Block Elements
Elimination Tool:

A) NaHCO3 with Zn

B) HCl with Zn

C) KOH with Zn

D) H2O with Zn

15 / 68

Which of the following is least polarizable?

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Ne

B) He

C) X

D) Kr

16 / 68

Which is the paramagnetic oxide of chlorine?

NUMS 2019 Reconduct
Chemistry
s and p Block Elements
Elimination Tool:

A) Cl2O7

B) Cl2O6

C) ClO2

D) ClO4

17 / 68

Sodium Is prepared by

Down's cell

Dutch's method

Castner-kellner process

Nelson's process

18 / 68

Caster kellners cell evaporated has replaced __________ because the Caster Kellner process evaporates__________?

NTS 2015 SMBBMC
Chemistry
s and p Block Elements
Elimination Tool:

A) Gibbs diaphragm… mercury

B) Iron box… aluminium

C) Pyrites burners… oleum

D) Nelson's cell…. Chlorine

19 / 68

Sodium reacts with water more vigorously than lithium because it:

NTS 2010
Chemistry
s and p Block Elements
Elimination Tool:

A) Has a higher atomic weight

B) Is more electronegative

C) Is more electropositive

D) Is a metal

20 / 68

What is the chemical formula of Epsom Salt?

MgSO4.7H20

MgCO3

MgCO3.CaCO3

Mg(SiO3)4

21 / 68

When alkali metal react with water the fire Is produced clue to:

Ions

Hydrogen gas

Water

None of these

22 / 68

Magnesium oxide is used in:

NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
Elimination Tool:

A) as antacid

B) as reractory material

C) vulcanisation of rubber

D) all of the above

23 / 68

Oxygen does not react with:

NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
Elimination Tool:

A) P

B) Na

C) S

D) Cl

24 / 68

Which of the following is chrome yellow’s pigment?

NTS 2015 SMBBMC
Chemistry
s and p Block Elements
Elimination Tool:

A) Pb2Cr2O5

B) PbCrO4.PbO

C) PbCrO4

D) PbCl2.4PbO

25 / 68

Metals belonging to the same group in the periodic table are

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Magnesium and Na

B) Magnesium and Copper

C) Magnesium and Barium

D) Magnesium and Potassium

26 / 68

Potassium, Rubidium, Cesium react with oxygen to form which types of oxides?

PMC 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) Peroxide

B) Superoxide

C) Suboxide

D) Normal oxide

27 / 68

Which property of the Group II elements (magnesium to barium) and their compounds increases with an increasing proton (atomic) number?

NUMS 2016
Chemistry
s and p Block Elements
Elimination Tool:

A) The magnitude of the enthalpy change of hydration of the metal ion

B) The pH of the aqueous chloride

C) The solubility of the sulphate in water

D) The stability of the carbonate to heat

28 / 68

Red lead is:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) PbO

B) Pb3O4

C) Pb2O4

D) Pb2O5

29 / 68

Densities of alkali metals are low due to:

PMC 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) Weak intermolecular forces

B) Large atomic volume

C) Smaller size

D) Ns1 configuration

30 / 68

Strontium lies between calcium and barium in Group II A in the Periodic Table. Which of the properties could be predicted for strontium?

NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
Elimination Tool:

A) It forms a water-soluble carbonate that does not decompose on heating.

B) It forms a sparingly soluble sulfate

C) It forms a nitrate which decomposes on heating to form strontium nitrite and oxygen.

D) It is reduced by cold water, liberating hydrogen.

31 / 68

Aqueous solution of Na2CO3is:

NTS 2011
Chemistry
s and p Block Elements
Elimination Tool:

A) Acidic

B) Alkaline

C) Both Acidic and Alkaline

D) Neutral

32 / 68

Which one of the following alkaline earth metal carbonates is thermally the most stable?

NUMS 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) BaCO3

B) MgCO3

C) CaCO3

D) SrCO3

33 / 68

To avoid the formation of toxic compounds with chlorine, which substance is used for disinfecting water?

NUMS 2016
Chemistry
s and p Block Elements
Elimination Tool:

A) KMnO4

B) Chloramines

C) O3

D) Alums

34 / 68

Which of the following has the highest value of electronegativity?

PMC 2020
Chemistry
s and p Block Elements
Chemical Bonding
Elimination Tool:

A) I

B) Br

C) Cl

D) F

35 / 68

Which of the following statements about H2S is false:

NTS 2010
Chemistry
s and p Block Elements
Elimination Tool:

B) It is a gas with a bad smell

C) It is a strong reducing agent

D) It is a molecule which is non linear

E) It is a weak base in water

36 / 68

Which of the following oxides is most acidic oxide?

NUMS 2019 Reconduct
Chemistry
s and p Block Elements
Elimination Tool:

A) Al2O3

B) Cl2O3

C) Na2O3

D) CaO

37 / 68

Pierrie Curie and Marie Curie isolated which radioactive element?

NTS 2015 SMBBMC
Biology
s and p Block Elements
Elimination Tool:

A) Lithium

B) Radium

C) Boron

D) Uranium

38 / 68

________ are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals?

NTS 2015 SMBBMC
Chemistry
s and p Block Elements
Elimination Tool:

A) Covalent hydrides

B) Ionic hydrides

C) Borderline hydrides

D) Metallic hydrides

39 / 68

The ionization of Hydrogen atom gives:

NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
Elimination Tool:

A) hydride ion

B) hydronium ion

C) proton

D) hydroxyl ion

40 / 68

Which of the following is the correct order of electronegativity (from highest to lowest)?

NTS 2015 SMBBMC
Biology
s and p Block Elements
Chemical Bonding
Elimination Tool:

A) F , O, N , C

B) N, F , O, C

C) C, F, N, O

D) C, F, O, N

41 / 68

Which is most basic in character?

NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
Elimination Tool:

A) RbOH

B) KOH

C) LIOH

D) NaOH

42 / 68

Which alkaline earth metal make peroxide?

NUMS 2019 Reconduct
Chemistry
s and p Block Elements
Elimination Tool:

A) Ba

B) Be

C) Mg

D) Ca

43 / 68

The chemical name of the baking powder is:

NTS 2011
Chemistry
s and p Block Elements
Elimination Tool:

A) Sodium carbonate

B) Sodium bicarbonate

C) Sodium hydrogen carbonate

D) Sodium hydroxide

44 / 68

Which of the following elements has the highest boiling point?

NTS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Li

B) Mg

C) Sr

D) Be

45 / 68

The most dense element is:

NTS 2013
Chemistry
s and p Block Elements
Elimination Tool:

A) Li

B) K

C) Ca

D) Ba

46 / 68

What is the chemical formula for plaster of Paris?

NTS 2010
Chemistry
s and p Block Elements
Elimination Tool:

A) CuSO4. 5H2O

B) 2CaSO4. 2H2O

C) (CaSO4)2 H2O

D) MgSO4. 7H2O

47 / 68

Which one of the following is a common mineral of calcium? a

Feldspar

Limestone

Diamond

None of these

48 / 68

7) Gypsum supplies to soil

Carbon

Sulpuhr

Nitrogen

Calcium

Both b and d

49 / 68

When Gypsum is heated to about 100° C, it losses some water of crystallization and becomes:

NTS 2011
Chemistry
States of Matter – Gases, Liquids and Solids
s and p Block Elements
Elimination Tool:

A) Epsom salt

B) Kieserite

C) Plaster of Paris

D) Bleaching Powder

50 / 68

Only two elements are present in:

NTS 2011
Chemistry
s and p Block Elements
Elimination Tool:

A) Period 1

B) Period 2

C) Period 3

D) Period 4

51 / 68

Which of the following is unstable?

Li2CO3

MgCO3

c) Both a and b

Both are stable

52 / 68

The basic character of alkali metal oxides:

Decreases down the group

Remains same

Increases down the group

None of these

53 / 68

The false statement regarding saline hydrides is:

NTS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) They are formed from hydrogen and most electropositive element

B) They are used as reducing agents

C) They give H2 from H2O

D) They are ionic in nature

54 / 68

Color of Epsom salt Is

White

Pink

Blue

Green

55 / 68

Li is an element of group?

II-A

Ill-A

I-A

IV-B

56 / 68

Rocky crust of earth is mainly composed of?

Oxygen and Silicon

Oxygen and Hydrogen

b) Oxygen and Carbon

Carbon and Hydrogen

57 / 68

Most abundant salt of sodium in nature is:

NTS 2017
Chemistry
s and p Block Elements
Elimination Tool:

A) NaNO3

B) Na2SO4

C) NaOH

D) NaCl

58 / 68

The nitrides of alkaline earth metals hydrolyse with water to form:

NUMS 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) NH3

B) H2

C) N2

D) NO

59 / 68

Which one of these reacts rapidly with water at room temperature?

60 / 68

Point out the property which is not characteristic of alkali metal:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Low electronegativity

B) Low melting point

C) Their ions are isoelectronic with noble gas

D) High ionization energy

61 / 68

Which of the following statements is true?

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Alkali metal hydroxides are stable to heat except LiOH

B) CaOH is a stronger base than NaOH

C) When NaOH is made the gas released at the cathode is C12

D) NaOH is named as caustic soda because it reacts with fats to form soap.

62 / 68

Magnesium reacts with nitrogen to form:

PMC 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) Mg2N2

B) Mg3N2

C) MgN2

D) MgN

63 / 68

For Alkali Metals, decrease in the ionization potential is because of the increasing:

Charge on the nucleus

) Distance between nucleus and outer most electron

Size of the atom

None of these

64 / 68

The carbonates of alkali metals are soluble in water except:

NUMS 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) K2CO3

B) Li2CO3

C) Na2CO3

D) Rb2CO3

65 / 68

Group 1A and 11A are known as: ) s block elements d) P block elements

Alkali

Alkaline earth

) s block elements

P block elements

66 / 68

Melting point of Group I-A elements is than Group II-A elements

Higher

lower

Same

Varies

67 / 68

Identify the correct statement:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) Element sodium can be prepared and isolated by electrolyzing an aqueous solution of NaCl

B) Elemental Na is a strong oxidizing agent

C) Elemental Na is insoluble in NH3

D) Elemental Na is easily oxidizing

68 / 68

Which of the following is a major mineral of Lithium?

Spodumene

Rock salt c

Carnallite

Alunite

Your score is

The average score is 59%

Importance of s-Block Elements MCQs

A strong understanding of s-Block Elements helps students explain the reactivity, trends, and chemical behavior of alkali and alkaline earth metals. Exams often include MCQs on properties, reactions, and comparative chemistry of these elements. Practicing chapter-wise MCQs improves conceptual clarity, accuracy, and confidence in solving competitive exam questions.

Effective Strategy for Free Preparation

For effective preparation, students should memorize trends and reactions, understand properties conceptually, and solve topic-wise MCQs consistently. Attempting free tests and past paper questions helps identify frequently asked concepts and repeated exam patterns. PLS Academy provides structured MCQs and free resources to support Chemistry s-Block Elements preparation and other Class 12 Chemistry chapters.

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