Classification of Elements & Periodicity in Properties Test 10

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Classification of Elements & Periodicity in Properties Test 10

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Question 1
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Atomic number of the element ununbium is 112.
Reason (R): Name for digits 1 and 2 is un- and bi-respectively in latin words.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Both A and R are true and R is the correct explanation of A.
Question 2
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Second ionization enthalpy will be higher the first ionization enthalpy.
Reason (R): Ionization enthalpy is a quantitative measure of the tendency of an element to lose electron.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Second ionisation enthalpy is the energy required to remove a second electron from 1 mole of gaseous 1+ ions to give gaseous 2+ gives.
Second ionisation energy is greater than first ionisation energy because after removal of first electrons, the nuclear charge increases and electrons are held more tightly by the nucleus. This is makes the removal of second electrons difficult and hence requires more energy.
Both assertion and reason are true but reason is not the correct explanation of assertion. It is difficult to remove an electron from a positively charged ion than a neutral atom.
Question 3
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Second period consists of 8 elements.
Reason (R): Number of elements in each period is four times the number of atomic orbitals available in the energy level that is being filled.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled.
Question 4
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Alkali metals have least value of ionization energy within a period.
Reason (B): They precede alkaline earth metals in periodic table.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Both assertion and reason are true but reason is not the correct explanation of assertion. Alkali metals belong to first group and have largest size in a period and hence low I.E.
Question 5
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): In a triad, the three elements present have same gaps of atomic masses.
Reason (R): Elements in a triad have similar properties.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

In a triad, the atomic mass of the middle element is the mean of the atomic masses of the first and third elements.
Question 6
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Atomic size decreases in a period due to increase of atomic number.
Reason (R): The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, the atomic size of the element decreases from left to right.

A
Both A and R are true and R is the correct explanation of A.

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false.

D
Both A and R are false.

Solution

The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, due to increased effective nuclear charge, the atomic size of the element decreases from left to right.
Question 7
1 / -0

In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Helium is placed in group 18 along with p-block elements.
Reason (R): It shows properties similar to p-block elements.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

He (1s2) should be placed along with s-block elements because of its electronic configuration but it has a completely filled valence shell and as a result it exhibits properties of noble gases, thus it is placed along with noble gases (ns2, np6).
Question 8
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Smaller the size of an atom greater is the electronegativity.
Reason (R): Electronegativity refers to the tendency of atom so share electrons with other atom.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Assertion is true but reason is false.
Electronegativity refers to the tendency of atom to attract bonding electrons.
Question 9
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Electron gain enthalpy can be exothermic or endothermic.
Reason (B): Electron gain enthalpy provides a measure of the ease with which an atom adds an electron to form anion.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. Both A and R are false.

Solution

Both assertion and reason are true but reason is not the correct explanation of assertion.
Depending on the element, the process of adding an electron to the atom can be either endothermic or exothermic.
Question 10
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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): According to Mendeleev, periodic properties of elements is a function of their atomic number.
Reason (R): Atomic number is equal to the number of protons.

A
Both A and R are true and R is the correct explanation of A.

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false.

D
A is false but R is true

Solution

According to Mendeleev, physical and chemical properties of elements are periodic function of their atomic weights (atomic masses).
Atomic number is equal to the number of protons. It is also equal to the number of electrons present in the neutral atom.
Assertion is false but Reason is true

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Classification of Elements & Periodicity in Properties Test 10

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Question 1

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 2

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 3

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 4

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 5

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 6

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is true but R is false.

Both A and R are false.

Solution

Question 7

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 8

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 9

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. Both A and R are false.

Solution

Question 10

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is true but R is false.

A is false but R is true

Solution

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