Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 4

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Question 1
1 / -0

The successive ionisation energy values for an element 'X' are given below:

(i) 1^st ionisation energy = 410 kJ mol^-1(ii) 2^nd ionisation energy = 820 kJ mol^-1(iii) 3^rd ionisation energy = 1100 kJ mol^-1
(iv) 4^th ionisation energy = 1500 kJ mol^-1(v) 5^th ionisation energy = 3200 kJ mol^-1

Find out the number of valence electrons for an atom of 'X'.

A
4

B
3

C
5

D
2
Question 2
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Correct option to complete the following statement is :
"Mendeleeve's classification of element is based upon similarites in properties of different elements with increasing order of their atomic weights .
In cases where dissimarites in properties of an element appeared he placed the elements with similar ......... together".

A
properties

B
atomic number

C
atomic weight

D
molecular weights

Solution

Mendeleev believed that the properties of elements are function of their atomic weights. He arranged elements in increasing order of their atomic weight but gave priority to the properties over weight. Wherever a dissimilarity in properties of element occured during arranging them in ascending order of their atomic weights, he ignored the atomic weight of the element but kept the elements with similar properties together.
Thus , he laid more stress over the similarities in properties of different elements rather than their atomic weights.
Question 3
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In the modern periodic table

A
The horizontal rows are called periods and the vertical columns, groups.

B
The horizontal rows are called periods and the vertical columns, series.

C
The horizontal rows are called series and the vertical columns, groups.

D
The horizontal rows are called groups and the vertical columns, periods

Solution

In modern periodic table, the elements are arranged in the increasing order of their atomic number. It contains 7 horizontal rows called periods and 18 vertical columns called groups.
Question 4
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The existence of which of the following became the reason for the failure of Mendeleev's periodic law?

A
Alkali metals

B
Alkaline earth metals

C
Halogens

D
Isotopes
Question 5
1 / -0

Mendeleev 'Periodic Law' states that

A
The properties of the elements are the periodic function of their atomic weights.

B
The properties of the elements are a periodic function of the number of electrons.

C
The properties of the elements are a periodic function of their atomic number.

D
The properties of the elements are a periodic function of the number of neutrons.

Solution

If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.
Question 6
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Choose one of the following in the order of increasing radii:

A
I- > I > I+

B
I+ < I- < I

C
I- < I+ < I

D
I < I+ < I-

Solution

Size of anion is greater than the size of parent atom and size of cation. As the –ve charge of anion increases ionic radii increases due to decrease in the effective nuclear charge and vice versa.
Question 7
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Which of the following statements is correct?

A
X^– ion is larger in size than X atom.

B
X⁺ ion is larger in size than X atom.

C
X⁺ ion is larger in size than X^– ion.

D
X⁺ and X^– ions are equal in size.
Question 8
1 / -0

Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in

A
increasing order of their atomic numbers

B
decreasing order of their atomic numbers

C
decreasing order of their atomic weights

D
increasing order of their atomic weights

Solution

If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.
Question 9
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The elements of the same group of the periodic table have the same

A
number of protons

B
number of valence shells

C
number of valence electrons

D
electron affinity
Question 10
1 / -0

Mendeleev arranged the elements on the basis of their

A
increasing atomic numbers

B
increasing atomic masses

C
decreasing atomic numbers

D
decreasing atomic masses
Question 11
1 / -0

The correct order of ionisation energies is

A
s < p < d < f

B
s > p > d > f

C
s < d < p < f

D
s > d > p > f
Question 12
1 / -0

In which of the following arrangements is the order NOT according to the property indicated against it?

A
Li < Na < K < Rb : Increasing metallic radii

B
I < Br < F < Cl : Increasing electron gain enthalpies (with negative sign)

C
B < C < N < O : Increasing first ionisation enthalpies

D
Al³⁺ < Mg²⁺ < Na⁺ < F^- : Increasing ionic size
Question 13
1 / -0

Which of the following arrangements represents the correct order of electron gain enthalpies (with negative sign) of the given atomic species?

A
Cl < F < S < O

B
O < S < F < Cl

C
S < O < Cl < F

D
F < Cl < O < S
Question 14
1 / -0

The numbers of periods and groups in the long form of periodic table respectively are

A
7 and 9

B
8 and 18

C
7 and 18

D
6 and 10
Question 15
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Which of the following options contains a pair of elements that do not belong to the same group?

A
Li, Na

B
Be, Mg

C
C, N

D
H, Li
Question 16
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In any period, the valency of an element with respect to oxygen

A
increases one by one from IA to VIIA

B
decreases one by one from IA to VIIA

C
increases one by one from IA to IVA and then, decreases one by one from VA to VIIA

D
decreases one by one from IA to IVA and then, increases one by one from VA to VIIA
Question 17
1 / -0

Man-made elements belong to _____ series.

A
actinide

B
lanthanide

C
halogen

D
inert gas
Question 18
1 / -0

Which of the following has the largest size?

A
Al

B
Al⁺

C
Al²⁺

D
Al³⁺
Question 19
1 / -0

Among 3^rd row elements, the atomic size is the maximum for

A
sodium

B
argon

C
magnesium

D
chlorine
Question 20
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

Energy of 24.6 eV is required to remove the first electron from a helium atom. The total energy (in eV) required to remove both the electrons from He atom would be

A
38.2

B
49.2

C
54.4

D
79.0
Question 21
1 / -0

Mendeleev arranged elements in a periodic table in order of their increasing atomic weights in such a way that the elements with similar properties occupies

A
the same vertical column or group.

B
the same Horizontal row or series

C
the positions on the top left to bottom right diagonal

D
the positions on the bottom left to top right diagonal

Solution

Mendeleev arranged elements in horizontal rows and vertical columns of a table in order of their increasing atomic weights in such a way that the elements with similar properties occupied the same vertical column or group.This is because properties of elements are reapting after regular interval.
Question 22
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It is now recognized that the ‘Modern Periodic Law’ is essentially the consequence of

A
periodic variation in chemical properties

B
periodic variation in electronic configurations

C
periodic variations in the element lattice

D
periodic variation in chemical bonds

Solution

Modern Periodic Law of element may be defined as the Physical and chemical properties of the elements are periodic functions of their atomic numbers.It means, when the elements are arranged in the order of their increasing atomic numbers, it is observed that the elements of similar properties recur at regular intervals or periodically. As a result of this, the elements fall in certain groups and lead to an arrangement called the modern periodic table of elements. It must be noted that elements are arranged in the periodic table in order of atomic numbers because atomic number is the most fundamental property of an element. The systematic arrangement of elements in modern periodic table according their atomic number helps in justification of isotopes of elements at one place.
Question 23
1 / -0

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺will be

A
– 10.2 eV

B
– 5.1 eV

C
1.55 eV

D
2.55 eV
Question 24
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Mendeleev proposed that some of the elements were still undiscovered and, therefore, left several gaps in the table. He left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon. These were later discovered and named

A
Barium and Germanium respectively

B
Gallium and Germanium respectively

C
Gallium and Godolinium respectively

D
Mendelivium and Germanium respectively

Solution

Mendeleev arranged the elements according to their atomic weights. He corrected the atomic weights of few exisiting elements to explain their chemical and physical behaviour. Moreover, he felt that few elements are still to be discovered, so he left empty spaces for them in his periodic table. Two such elements whose properties he predicted; and were later discovered are Gallium and Germanium respectively.
Question 25
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Alkali metals belong to

A
s-block

B
p-block

C
d-block

D
f-block
Question 26
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Which of the following statements is true?

A
Atomic radii of elements decrease gradually from left to right.

B
Metallic character increases across a period.

C
Chemical reactivity increases and then decreases across a period.

D
Chemical reactivity increases across a period.
Question 27
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Complete the statement with suitable word /(s)
Modern Periodic Law is stated as:
"Physical and chemical properties of different elements are periodic functions of their ......... ?

A
molecular mass

B
isotopic masses

C
atomic numbers

D
atomic masses.

Solution

The Modern periodic law is stated as :
" Physical and chemical properties of elements are periodic functions of their atomic numbers. That is the properties of elements will be repeated after regular intervals.
Question 28
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Modern periodic law states that the periodic properties of elements are the periodic function of

A
ionization potential

B
atomic mass

C
atomic number

D
atomic volume
Question 29
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The first, second and third ionisation energies of an atom are 737, 1451 and 7733 kJ mol^–1, respectively. The element can be

A
Na

B
B

C
Al

D
Mg
Question 30
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According to the recommendation of International Union of Pure and Applied Chemistry (IUPAC), the groups in the modern periodic table are numbered from

A
1 to 12

B
1 to 8

C
1 to 10

D
1 to 18

Solution

The groups are numbered from 1 to 18; where group 1 is alkali metal group and group 18 is for the noble gases.

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Classification of Elements and Periodicity in Properties Test - 4

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Classification of Elements and Periodicity in Properties Test - 4

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Question 1

4

3

5

2

Question 2

properties

atomic number

atomic weight

molecular weights

Solution

Question 3

The horizontal rows are called periods and the vertical columns, groups.

The horizontal rows are called periods and the vertical columns, series.

The horizontal rows are called series and the vertical columns, groups.

The horizontal rows are called groups and the vertical columns, periods

Solution

Question 4

Alkali metals

Alkaline earth metals

Halogens

Isotopes

Question 5

The properties of the elements are the periodic function of their atomic weights.

The properties of the elements are a periodic function of the number of electrons.

The properties of the elements are a periodic function of their atomic number.

The properties of the elements are a periodic function of the number of neutrons.

Solution

Question 6

I- > I > I+

I+ < I- < I

I- < I+ < I

I < I+ < I-

Solution

Question 7

X– ion is larger in size than X atom.

X+ ion is larger in size than X atom.

X+ ion is larger in size than X– ion.

X+ and X– ions are equal in size.

Question 8

increasing order of their atomic numbers

decreasing order of their atomic numbers

decreasing order of their atomic weights

increasing order of their atomic weights

Solution

Question 9

number of protons

number of valence shells

number of valence electrons

electron affinity

Question 10

increasing atomic numbers

increasing atomic masses

decreasing atomic numbers

decreasing atomic masses

Question 11

s < p < d < f

s > p > d > f

s < d < p < f

s > d > p > f

Question 12

Li < Na < K < Rb : Increasing metallic radii

I < Br < F < Cl : Increasing electron gain enthalpies (with negative sign)

B < C < N < O : Increasing first ionisation enthalpies

Al3+ < Mg2+ < Na+ < F- : Increasing ionic size

Question 13

Cl < F < S < O

O < S < F < Cl

S < O < Cl < F

F < Cl < O < S

Question 14

7 and 9

X^– ion is larger in size than X atom.

X⁺ ion is larger in size than X atom.

X⁺ ion is larger in size than X^– ion.

X⁺ and X^– ions are equal in size.

Al³⁺ < Mg²⁺ < Na⁺ < F^- : Increasing ionic size

Al⁺

Al²⁺

Al³⁺