Chemistry Elements and Periodicity MCQs Chapter 1 Class 12 - PLS Academy

Chemistry Elements and Periodicity MCQs – Chapter 1 Class 12

Chemistry Elements and Periodicity is an important chapter of Class 12 Chemistry and plays a key 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 essential topics such as periodic table, periodic classification, periodic properties, atomic size, ionization energy, electron affinity, and electronegativity.

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Created on February 10, 2022 By Ali Durrani

Chemistry Ch 1 Class 12 Periodicity in Elements

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1 / 66

Smallest element in the periodic table is?

Hydrogen

Fluorine

Lithium

Uranium

2 / 66

Metals usually produce hydrogen gas with acids. Which of the following produces hydrogen gas with NaOH?

3 / 66

Who started the development of the First Periodic Table?

) Antoine Bequerel

Dimitri Mendeleev

Robert Boyle

John Newlands

4 / 66

Variable valency is shown by which of the following elements?

5 / 66

NaNO3 on heating gives:

NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:

A) O2

B) NO2

C) O2 + NO2

D) NaNO2 + O2

6 / 66

Transition elements have coloured compounds because:

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) Their bond energy is low

B) they easily absorb energy

C) splitting of the five degenerate d-orbitals take place

D) d-orbitals are very close to p-orbitals

7 / 66

Borax exists in nature as:

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) Na2B4O7.10H2O

B) Na2B4O7.7H2O

C) Na2B4O7.5H2O

D) Na2B4O7.3H2O

8 / 66

Why transition metals have strong metallic bonding?

PMC Sample 1
Chemistry
Periodicity in Elements
Elimination Tool:

A) Because of high melting point

B) Because d-electrons of outer shell take part in bonding

C) Because s-electrons of outer shell take part in bonding

D) Both s and d electrons takes part in bonding

9 / 66

Which of the following has maximum non-metallic character?

PMC Sample 2
Chemistry
Periodicity in Elements
Elimination Tool:

A) F

B) Cl

D) I

C) Br

10 / 66

The products of decomposition of Mg(NO3)2are:

NUMS 2017
Chemistry
Periodicity in Elements
Elimination Tool:

A) MgO and NO2

B) Mg and NO2

C) MgO, NO2and O2

D) Mg(NO3)2

11 / 66

By increasing which of the following factor polarizability increases?

PMC Practice 1
Chemistry
Periodicity in Elements
Elimination Tool:

A) Atomic radius

B) Ionization energy

C) Ionic radius

D) Hydration energy

12 / 66

Within each pair of elements F & Cl, S & Se, and Li & Na respectively, the elements that release more energy upon an electron gain are:

PMC Sample 3
Chemistry
Periodicity in Elements
Elimination Tool:

A) F, S and Li

B) Cl, S and Li

C) Cl, Se and Na

D) F, Se and Na

13 / 66

Outer transition elements belong to

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) s-block

B) p-block

C) d-block

D) f-block

14 / 66

Which orbitals take part in binding of transition elements

PMC Sample 1
Chemistry
Periodicity in Elements
Elimination Tool:

A) Outermost s orbital and p orbitals

B) Outermost d orbital and underlying half filled f-orbitals

C) Outermost p orbital and underlying half filled d-orbitals

D) Outermost s orbital and underlying half filled d-orbitals

15 / 66

11) Hydrogen has properties similar to:

Alkali metals

Halogens

Both a and b

None of these

16 / 66

Triads were introduced by

Newland

Dobreiner

Mendeleev

Al-Razi

17 / 66

Which of the following has the highest ionization energy?

NUMS 2019 Cancelled
Chemistry
Periodicity in Elements
Elimination Tool:

A) Al

B) S

C) Si

D) P

18 / 66

What is a complex/coordination compound?

PMC Sample 1
Chemistry
Periodicity in Elements
Elimination Tool:

A) A compound in which a metal atom or ion is covalently bonded with a group of neutral molecules or anions.

B) A compound that contains 2 or more than 2 different elements

C) A compound which has complex molecular geometry

D) A compound that contains a complex ion and can exist independently

19 / 66

Which if the following has the greatest difference between it’s first and second ionization energies?

NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:

A) Na

B) Ca

C) Mn

D) F

20 / 66

Arrange the following according to increasing ionization energy: Li, Be, Na, Mg

NUMS 2019 Cancelled
Chemistry
Periodicity in Elements
Elimination Tool:

A) Li < Be < Na < Mg

B) Be < Li < Na < Mg

C) Mg < Na < Li < Br

D) Na < Li < Mg < Be

21 / 66

ZnH2 is an example of?

NTS 2015 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Metallic hydrides

B) Complex hydrides

C) Polymeric hydrides

D) Borderline hydrides

22 / 66

Which statement is true about electron affinity?

NUMS 2020
Chemistry
Periodicity in Elements
Chemical Bonding
Elimination Tool:

A) The value of electron affinity is always positive

B) The value of electron affinity is always negative

C) The value of first electron affinity is always positive

D) The value of first electron affinity is always negative

23 / 66

7′ Period of the Periodic Table is:

Complete

Incomplete

Called Long Period

None of these

24 / 66

Which one of the following is acidic?

B(OH)3

Ca(OH)2

Mg(OH)3

NaOH

25 / 66

Metallic character of the elements:

NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

A) decreases down the groups

B) increases down the groups

C) decreases across the periods

D) increases across the periods

26 / 66

The ionization energy increases from left to right in a period due to increase in?

PMC Practice 1
Chemistry
Periodicity in Elements
Elimination Tool:

A) Nuclear charge

B) Number of electrons

C) Atomic number

D) All of these

27 / 66

Hydrogen resembles with alkali metals in all respects except

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Half – filled valence shell

B) Formation of unipositive ion

C) Reducing nature

D) Valence shell electronic configuration

28 / 66

Boiling point of hydrides of the 4th period is larger than __________.

PMC Practice 2
Chemistry
Periodicity in Elements
Elimination Tool:

A) 5th period

B) 3rd period

C) 6th period

D) 7th period

29 / 66

Which of the following is not the use of bleaching powder?

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Sterilization of drinking water

B) Oxidation of alcohols

C) Bleaching Linen

D) Preparation of Chlorine

30 / 66

P2O5 is Hygroscopic powder which sublimes at:

NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:

A) 260 Degree Celsius

B) 360 Degree Celsius

C) 630 Degree Celsius

D) 690 Degree Celsius

31 / 66

Down’s cell is used to prepare:

NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

A) Sodium carbonate

C) Sodium hydroxide

B) Sodium bicarbonate

D) Sodium metal

32 / 66

According to which phenomenon, “the properties of elements are the periodic function of their atomic number.”

NTS 2012
Chemistry
Periodicity in Elements
Elimination Tool:

A) Mendeleev's periodic law

C) Doberenier's triads

D) Lothar Meyer’s classification

E) Modern periodic law

33 / 66

6th period of periodic table contains elements:

34 / 66

The periodic table consists of:

NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:

A) 7 horizontal series, 7 vertical series and 2 blocks

B) 8 horizontal series, 7 vertical series and 2 blocks

C) 7 horizontal series, 18 vertical series and 4 blocks

D) 8 horizontal series, 18 vertical series and 8 blocks

35 / 66

Which of the following statements about H2S is false?

NTS 2017
Chemistry
Periodicity in Elements
Elimination Tool:

A) It is a covalent compound

B) It is a gas with bad smell

C) It is a stronger reducing agent than H2O

D) It is a weak base in water

36 / 66

Ionization energy decreases down the group, from top to bottom, due to:

UHS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

A) Increase in atomic mass

B) Increase in shielding effect of the intervening electrons

C) Increase in proton number

D) Decrease in atomic size

37 / 66

Aqua regia can dissolve noble metal due to the formation of

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Nitrous acid

B) Nitric oxide

C) Nitrosyl chloride

D) Nascent nitrogen

38 / 66

Periodic table is divided into groups A and 6:

To differentiate between normal and transition elements

To differentiate between metals and non-metals

To differentiate between d and f block elements

None of these

39 / 66

Which of the following catalysts is used in the decomposition of laughing gas N2O at 1000 K?

2N2O 2N2 + O2

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Glycine

B) V2O5

C) Fe

D) Traces of Cl2

40 / 66

In Contact Process arsenic impurities act as poison for:

NUMS 2019 Reconduct
Chemistry
Periodicity in Elements
Elimination Tool:

A) Fe(OH)3

B) V2O5

C) Fe2O3

D) H2S2O7

41 / 66

Which group of elements shows greatest electrical conductivity?

Alkali metals

Alkaline earth metals

Halogens

Coinage Metals

42 / 66

Which of the following statements are correct about noble gases?

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) They are in between halogens and IA group.

B) Except Rn, all the remaining atoms are present in the air.

C) These elements belong to 17th group in IUPAC system.

D) These are highly reactive elements.

43 / 66

Maximum ionization potential is of:

NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:

A) Ca

B) Na

C) Be

D) Mg

44 / 66

Covalent character of hydrides decrease ________?

PMC Practice 1
Chemistry
Periodicity in Elements
Elimination Tool:

A) Down the Group

B) Along period

C) Along d- block

D) All of these

45 / 66

Covalent hydrides are:

Gaseous

Solid

Liquids

Both a & c

46 / 66

The formula of washing soda is:

NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:

A) N2CO3

B) Na2CO3 . H2O

C) Na2CO3 . 7H2O

D) Na2CO3 . 10 H2O

47 / 66

Hydrogen resembles the elements of groups:

NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

A) I-A, V-A and VIll-A

B) I-A, IV A and Vl-A

C) I-A, II-A and VIl-A

D) I-A, IV-A and VIl-A

48 / 66

What are the products of the below-mentioned equation?

HNO3 +3HCI→

NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

A) 2H2O + NOCI+Cl2

B) H2 + NOCI+ 2HOCI

C) H2O+ NOCI+ 2HCl

D) 2H2O+NOCI+ 2Cl

49 / 66

The chemical formula of chromyl chloride gas is?

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Cr2O3

B) CrO2Cl2

C) CrOCl2

D) CrCl3

50 / 66

Ionic radius in period from left to right:

NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:

A) Decreases

B) Increases

C) I st increase and then decrease

D) I st decrease and then increase

51 / 66

Number of elements in 6th period is:

52 / 66

The chemical formula of Tincal is:

NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

C) Na2B4O7 . 10 H2O

A) Na2B2O7.10H2O

B) Na2B4O7 . H2O

D) Na2B2O5 . 10 H2O

53 / 66

Hydration energy increases with

With high charge density

Distance between nucleus and outer most electron

Size of the atom

None of these

54 / 66

At the end of the periodic table _____ are found.

NTS 2016 DUHS & JSMU
Chemistry
Periodicity in Elements
Elimination Tool:

A) S block element

B) P block element

C) D block element

D) Noble gases

55 / 66

What is the charge on a hydrogen ion?

— 1

-2

56 / 66

Which of the following elements has the lowest ionistion enthalpy?

PMC Sample 2
Chemistry
Periodicity in Elements
Elimination Tool:

A) Na

B) K

C) Mg

D) Al

57 / 66

A gas that reacts with CaO and not with NaHCO3 is:

NTS 2017
Chemistry
Periodicity in Elements
Elimination Tool:

A) CO2

B)CI2

C) O2

D) N2

58 / 66

Which of the following has the least electron affinity value?

NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:

A) 12 C 6

B) 14 N 7

C) 16 8 7

D) 19F 9

59 / 66

In which of the following chromium has different oxidation state?

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) K2Cr2O7

B) CrCl3

C) CrO3

D) K2CrO4

60 / 66

Element that is not found in Free State is?

None of these

61 / 66

Which of following pair has highest conductivity?

Gold, Aluminium

Gold, Tungsten

Silver, Copper

Carbon, Gold

62 / 66

Non-stoichiometric compounds are formed by:

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) Only alkali metals

B) Only transition elements

C) Only noble gases

D) None of the above

63 / 66

The false statement about lithium is:

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) It is softer than other alkali metals

B) It is least reactive

C) It possesses higher melting and boiling points

D) It forms chloride which is soluble in alcohol

64 / 66

The binding energy of transition metal increases upto group:

NUMS 2020
Chemistry
Periodicity in Elements
Elimination Tool:

A) IIB

B) IVB

C) IIIB

D) VIB

65 / 66

Magnesium oxide is used in the making of the lining of blast furnaces. It is extracted from seawater as follows. Aqueous calcium hydroxide is added to seawater.

Ca(OH)2 (aq) + MgCl2 (aq) + Mg(OH)2 (s) + CaCl2 (aq)

The magnesium hydroxide is then filtered off and roasted.

Which of the following comparisons between calcium and magnesium explains why magnesium hydroxide forms?

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) Magnesium is less electropositive than calcium.

B) Magnesium is lower than calcium in the reactivity series

C) The enthalpy change of hydration for Mg2+is less exothermic than for Ca2+

D) The solubility product for Mg(OH)2is lower than that for Ca(OH)2

66 / 66

Whidi group has coinage metals?

IIB

IIIA

Your score is

The average score is 57%

Importance of Elements and Periodicity MCQs

A strong understanding of elements and periodicity helps students explain trends in the periodic table and solve numerical and conceptual problems. Exams often include MCQs on periodic properties, comparison of elements, and prediction of chemical behavior. Practicing chapter-wise MCQs improves accuracy, conceptual clarity, and confidence for competitive exams.

Effective Strategy for Free Preparation

For effective preparation, students should revise periodic trends, memorize key definitions, and solve topic-wise MCQs consistently. Attempting free tests and past paper questions helps identify frequently tested concepts and repeated exam patterns. PLS Academy provides structured MCQs and free resources to support Chemistry Elements and Periodicity preparation and other Class 12 Chemistry chapters.

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