Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 24

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Question 1
1 / -0

Which of the following statements are true about the modern form of the periodic table?

A
Properties of the elements are the periodic functions of their atomic number

B
There are 7 periods

C

There are 18 numbered groups

D
All of the above

Solution

The modern periodic table is the tabular arrangement of chemical elements ordered by their atomic number. The rows of the table are called as periods which are 7 in number and the columns are called as groups which are 18 in total.
Question 2
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The valency of elements in the periodic table with respect to hydrogen:

A
increases regularly from $$1$$ to $$8$$

B
decreases regularly from $$1$$ to $$8$$

C
first increases from group I to group IV and then decreases

D
first decreases from group I to group IV and then increases

Solution

Valency is mainly concerned with number of valence electrons or 8 minus number of electrons present in the outermost shell. Number of valence electrons increases upto group IV and then starts decreasing due to addition of electrons in the same shell.
Question 3
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Which of the following pair of elements are expected to have similar properties according to Newland's law of octaves?

A
$$Ne, Ar$$

B
$$C, N$$

C
$$Na, K$$

D
$$P, S$$

Solution

Newland's law of octaves states that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.
Na and K will have similar properties according to it.
Question 4
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The Newland's law of octaves for the classification of elements was found to be applicable only up to the element ______________________.

A
Potassium

B
Calcium

C
Cobalt

D
Phosphorous

Solution

Newland's law of octaves for the classification of elements was found to be applicable only up to the element $$Calcium$$.

Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.

Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law.
Question 5
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Which element has smallest atomic size?

A
Fluorine

B
Chlorine

C
Bromine

D
Iodine

Solution

The atomic size increases down the group because new shells are added when we move along the group. This increases the distance between the outermost electrons and the nucleus, so the atomic size increases inspite of the increase in nuclear charge.
Therefore, fluorine has the smallest atomic size in the group.
Question 6
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Which of the following set of elements is written in order of their increasing metallic character?

A
$$Be< Mg< Ca$$

B
$$Na< Li <K$$

C
$$Mg <Al <Si$$

D
$$C <O< N$$

Solution

The metallic character increases as we move down the group in the modern periodic table. Thus the correct order of metallic character is $$Be<Mg<Ca$$.
Also, the metallic character decreases across the period.
Question 7
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If three elements $$X, Y,$$ and $$Z$$ form a Dobereiner's triad and atomic weights of $$X$$ and $$Z$$ are $$9$$ and $$40$$ respectively, then the atomic weight of the element $$Y$$ is approximate:

A
24.5

B
49

C
34.5

D
29

Solution

According to Dobereiner, the atomic weight of the central element of the triad is the arithmetic mean of the atomic weights of the other two members.

Therefore, atomic weight of Y = $$\cfrac{9 + 40}{2} = 24.5\ g$$
Hence, option A is correct.
Question 8
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The anomalous pairs in Mendeleev's periodic table is/are_______.

A
Co, Ni

B
Te, I

C
Ar, K

D
All the above

Solution

Anomalous pair is a set of two elements in which an element with higher atomic weight is placed before elements with lower atomic weight.
Example: $$Co$$ with atomic number 58.93 was placed before $$Ni$$ with atomic weight 58.61. Similarly, $$Te$$ (127.6 u) was placed before $$I$$ (126.9u), and $$Ar$$ (39.9u) was placed before $$K$$ (39.0).
Thus, all the given options form anomalous pairs.
Question 9
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The elements $$A$$ and $$B$$ obey Newland's law of octaves. How many elements are there between $$A$$ and $$B$$?

A
7

B
8

C
5

D
6

Solution

According to the law of octaves, elements with similar physical and chemical properties occur after each interval of seven.

Thus, if $$A$$ is the first element and $$B$$ is the eighth element, the number of elements in between $$A$$ and $$B$$ is 6.

Hence, option D is correct.
Question 10
1 / -0

The element placed with nickel in the table formed by Newlands was :

A
iron

B
cobalt

C
chromium

D
copper

Solution

Newlands placed Cobalt (Co) and Nickel (Ni) in the same group as they have similar properties, but kept Iron (Fe) very far from these elements while iron, cobalt and nickel have similar properties.

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Periodic Classification of Elements Test - 24

Result

Periodic Classification of Elements Test - 24

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SHARING IS CARING

Question 1

Properties of the elements are the periodic functions of their atomic number

There are 7 periods

There are 18 numbered groups

All of the above

Solution

Question 2

increases regularly from $$1$$ to $$8$$

decreases regularly from $$1$$ to $$8$$

first increases from group I to group IV and then decreases

first decreases from group I to group IV and then increases

Solution

Question 3

$$Ne, Ar$$

$$C, N$$

$$Na, K$$

$$P, S$$

Solution

Question 4

Potassium

Calcium

Cobalt

Phosphorous

Solution

Question 5

Fluorine

Chlorine

Bromine

Iodine

Solution

Question 6

$$Be< Mg< Ca$$

$$Na< Li <K$$

$$Mg <Al <Si$$

$$C <O< N$$

Solution

Question 7

24.5

49

34.5

29

Solution

Question 8

Co, Ni

Te, I

Ar, K

All the above

Solution

Question 9

7

8

5

6

Solution

Question 10

iron

cobalt

chromium

copper

Solution

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