Chemistry s-Block Elements MCQs Chapter 2 Class 12

Created on February 10, 2022 By Ali Durrani

Chemistry Ch 2 Class 12 s and p Block Elements

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1 / 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

2 / 68

What is the chemical formula of Epsom Salt?

MgSO4.7H20

MgCO3

MgCO3.CaCO3

Mg(SiO3)4

3 / 68

The most dense element is:

NTS 2013
Chemistry
s and p Block Elements
Elimination Tool:

A) Li

B) K

C) Ca

D) Ba

4 / 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

5 / 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

6 / 68

Li is an element of group?

II-A

Ill-A

I-A

IV-B

7 / 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

8 / 68

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

Ions

Hydrogen gas

Water

None of these

9 / 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

10 / 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

11 / 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

12 / 68

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

Na

Fe

Al

Ca

13 / 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

14 / 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

15 / 68

Which of the following is unstable?

Li2CO3

MgCO3

c) Both a and b

Both are stable

16 / 68

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

Higher

lower

Same

Varies

17 / 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

18 / 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

19 / 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

20 / 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

21 / 68

Which of the following is a major mineral of Lithium?

Spodumene

Rock salt c

Carnallite

Alunite

22 / 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

23 / 68

Rocky crust of earth is mainly composed of?

Oxygen and Silicon

Oxygen and Hydrogen

b) Oxygen and Carbon

Carbon and Hydrogen

24 / 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

25 / 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

26 / 68

Red lead is:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) PbO

B) Pb3O4

C) Pb2O4

D) Pb2O5

27 / 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

28 / 68

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

Alkali

Alkaline earth

) s block elements

P block elements

29 / 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

30 / 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

31 / 68

Sodium Is prepared by

Down's cell

Dutch's method

Castner-kellner process

Nelson's process

32 / 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

33 / 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

34 / 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

35 / 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

36 / 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

37 / 68

Which of the following do not occur in Free State?

Li

Mg

Both

None of these

38 / 68

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

Feldspar

Limestone

Diamond

None of these

39 / 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

40 / 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

41 / 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

42 / 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

43 / 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

44 / 68

The basic character of alkali metal oxides:

Decreases down the group

Remains same

Increases down the group

None of these

45 / 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.

46 / 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

47 / 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

48 / 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

49 / 68

7) Gypsum supplies to soil

Carbon

Sulpuhr

Nitrogen

Calcium

Both b and d

50 / 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

51 / 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.

52 / 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

53 / 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

54 / 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

55 / 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

56 / 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

57 / 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

58 / 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

59 / 68

Color of Epsom salt Is

White

Pink

Blue

Green

60 / 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

61 / 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

62 / 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

63 / 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

64 / 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-

65 / 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.

66 / 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

67 / 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

68 / 68

Formula of Epsom salt is:

a

b

c

d

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Chemistry s-Block Elements MCQs Chapter 2 Class 12

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