Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

A solution of $$CuSO_{4}$$ was kept in an iron pot. After few days the iron pot was found to have a number of holes in it. The balance equation of the reaction involve is:

A
$$2Fe+CuSO_{4} \rightarrow Fe_2{(SO_{4})}_3 + Cu$$

B
$$Fe+CuSO_{4} \rightarrow FeSO_{4} + Cu$$

C
$$3Fe+CuSO_{4} \rightarrow Fe_3({SO_{4}})_4 + Cu$$

D
$$Fe+CuSO_{4} \rightarrow Fe_2SO_{4} + Cu$$
Question 2
1 / -0

Electronic configuration of magnesium is:

A
$$2, 8, 2$$

B
$$2, 8, 1$$

C
$$2, 8, 7$$

D
$$2, 1$$
Solution
Magnesium has atomic number $$12$$. It will be distributed in K, L, M shell in the following way:
K shell can accommodate a maximum of $$2$$ electrons.
L shell can accommodate a maximum of $$8$$ electrons and
M shell will accommodate 2 electrons
So the configuration becomes $$2,8,2$$.
Question 3
1 / -0

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

A
CI < F < O < S

B
O < S < F < Cl

C
F < S < O < Cl

D
S < O < Cl < F

Solution

The electron gain enthalpy (EA) of elements increases along a period towards right. Also it decreases down the group. However the EA of Cl is higher than that of F and EA of S is higher than that of O as F and O are very small in size. Thus the correct order of EA is
$$O<S<F<Cl$$
Question 4
1 / -0

The order of first electron affinity of O, S and Se is :

A
O > S > Se

B
S > Se > O

C
Se > O > S

D
S > O > Se

Solution

O has an exceptionally smaller value of electron affinity $$(-141 kJmol^{-1})$$ due to smaller atomic size than sulphur (weaker electron-electron repulsion in 3p-subshell). It is less than Se and Te also.

$$ S>Se>O$$

Thus, option $$B$$ is correct.
Question 5
1 / -0

The electron affinity for the inert gases is :

A
zero

B
high

C
negative

D
positive

Solution

Inert gases in group 18, have stable fully filled outermost (valence) shell. Therefore, their affinity to add electron is zero.
Question 6
1 / -0

The atomic number of chlorine is 17. Its electronic configuration is:

A
K, L, M

2, 10, 5

B
K, L, M

2, 8, 7

C
K, L, M

7, 8, 2

D
K, L, M

5, 10, 2

Solution

The atomic number of Chlorine(Cl) is 17 and the electronic configuration is; $$2,8,7$$ with seven electrons in the valence shell.
Question 7
1 / -0

The noble gases are nonreactive because :

A
they react with sodium

B
they have a full outer shell of electrons

C
they have a half outer shell of neutrons

D
they are too thin

Solution

They have 8 electrons in their outermost shell (except He which has 2 electrons). Therefore, their valency is zero and they are nonreactive as they can neither add nor donate electrons to react.
Question 8
1 / -0

In this ladder, symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the periodic table.

A
H, He, Li, Be, B, C, O,N, F, Ne, Mg, Na, Al, Si, P, S, Cl, Ar, K, Ca

B
H, He, Li, B, Be, C, N, O, F, Ne, Na, Mg, Al, S, P, Si, Cl, Ar, K, Ca

C
H, He, Li, Be, B, C, N, O, F, Na, Ne, Mg, Al, S, P, S, Cl, Ar, K, Ca

D
H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca

Solution

H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca.

Option D is correct.
Question 9
1 / -0

As you go down in a group, the alkali metals become:

A
brighter

B
hotter

C
more reactive

D
less reactive

Solution

Alkali metals are the elements present in group 1 in the periodic table. They are very reactive metals and their reactivity increases as we move down the group from top to bottom because of an increase in the atomic size.
Option C is correct.
Question 10
1 / -0

Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original order?

A
Alkali metals

B
Alkaline earth metals

C
Non - metals

D
Noble gases

Solution

According to Mendeleevs classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties. Noble gas being inert, could be placed in a separate group without disturbing the original order.

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Classification of Elements and Periodicity in Properties Test - 24

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Classification of Elements and Periodicity in Properties Test - 24

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Question 1

$$2Fe+CuSO_{4} \rightarrow Fe_2{(SO_{4})}_3 + Cu$$

$$Fe+CuSO_{4} \rightarrow FeSO_{4} + Cu$$

$$3Fe+CuSO_{4} \rightarrow Fe_3({SO_{4}})_4 + Cu$$

$$Fe+CuSO_{4} \rightarrow Fe_2SO_{4} + Cu$$

Question 2

$$2, 8, 2$$

$$2, 8, 1$$

$$2, 8, 7$$

$$2, 1$$

Solution

Question 3

CI < F < O < S

O < S < F < Cl

F < S < O < Cl

S < O < Cl < F

Solution

Question 4

O > S > Se

S > Se > O

Se > O > S

S > O > Se

Solution

Question 5

zero

high

negative

positive

Solution

Question 6

K, L, M2, 10, 5

K, L, M2, 8, 7

K, L, M7, 8, 2

K, L, M5, 10, 2

Solution

Question 7

they react with sodium

they have a full outer shell of electrons

they have a half outer shell of neutrons

they are too thin

Solution

Question 8

H, He, Li, Be, B, C, O,N, F, Ne, Mg, Na, Al, Si, P, S, Cl, Ar, K, Ca

H, He, Li, B, Be, C, N, O, F, Ne, Na, Mg, Al, S, P, Si, Cl, Ar, K, Ca

H, He, Li, Be, B, C, N, O, F, Na, Ne, Mg, Al, S, P, S, Cl, Ar, K, Ca

H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca

Solution

Question 9

brighter

hotter

more reactive

less reactive

Solution

Question 10

Alkali metals

Alkaline earth metals

Non - metals

Noble gases

Solution

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K, L, M

2, 10, 5

K, L, M

2, 8, 7

K, L, M

7, 8, 2

K, L, M

5, 10, 2