The s-Block Elements Test 15

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The s-Block Elements Test 15

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following chloride is covalent ?

A
$$BaCl_2$$

B
$$NaCl$$

C
$$CaCl_2$$

D
$$BeCl_2$$

Solution

Option $$(D)$$ is correct.
$$BeCl_2$$ is covalent in nature due to the small size and high charge density of $$Be$$, its polarizing power is maximum since $$Be^{2+}$$ ion essentially pull the electrons cloud from $$Cl^-$$, such that the electrons pair are effectively shared. This give covalent character to $$BeCl_2$$.
Question 2
1 / -0

$$Be$$ shows diagonal relationship with:

A
$$B$$

B
$$Mg$$

C
$$Al$$

D
$$Ga$$

Solution

Option $$(C)$$ is correct.
$$Be$$ shows diagonal relationship with $$Al$$. They both have nearly equal electronegativity, small size and availability of only four orbitals in the valence shell. They both form amphoteric oxides and dimeric halides.
Question 3
1 / -0

Find correct order of polarising power between $$Al^ {+2}$$ and $$Be^{+2}$$ (both shows digonal relationship) :

A
$$Be^{+2} > Al^{+2}$$

B
$$Be^{+2} < Al^{+2}$$

C
$$Be^{+2} > > Al^{+2}$$

D
$$Be^{+2} = Al^{+2}$$

Solution

Option (D) is correct.
Order of polarising power between $$Al^ {+3}$$ and $$Be^{+2}$$ (both shows digonal relationship) is $$Be^{+2} = Al^{+3}$$.
Polarising power depends on the size of the cation.As the size of beryllium and aluminium are almost same , thus possess same polarising power.
Question 4
1 / -0

Which of the following properties are common between Be and Al because of diagonal relationship?

A
The carbonates of both the metals are unstable

B
Salt of both do not impart color to the flame

C
Both combine with nitrogen when strongly heated in an atmosphere

D
All of these

Solution

Option $$(D)$$ is correct.
The following properties are common between $$Be$$ and $$Al$$ because of diagonal relationship
1. The carbonates of both the metals are unstable.
2. Salt of both do not impart color to the flame.
3. Both combine with nitrogen when strongly heated in an atmosphere.
4. Both have almost same and smaller size and thus favour for covalent bonding.
5. Both these form covalent compounds having low melting point and soluble in organic solvent.
6. Both have same value of electronegativity.
7. Both form polymeric covalent hydrides while hydrides of other alkaline earth are ionic.
Question 5
1 / -0

Which of the following property is not shown by $$Be$$ and $$Al$$ due to the diagonal relationship?

A
Oxide of both are amphoteric in nature

B
Oxides of both are non-volatile and hard

C
Hydroxides are amphoteric in nature

D
Both are metals

Solution

Option $$(D)$$ is correct.
Rest all the options shows the diagonal relationship between beryllium and aluminium.
Question 6
1 / -0

The charge/radius ratio of $$Be$$ and $$Al$$ is same because:

A
both belongs to the same group

B
both belongs to same period

C
digonal relationship

D
none of these

Solution

Option $$(C) $$ is correct.
The charge/radius ratio of $$Be$$ and $$Al$$ is same because of diagonal relationship and hence these two elements possess similar deforming power.
Question 7
1 / -0

$$Be$$ and $$Al$$ have following resemblance due to the diagonal relationship:

A
have nearly equal electronegativity

B
form amphoteric oxides

C
both form dimeric halides

D
all of the above

Solution

Option $$(D)$$ is correct.
$$Be$$ and $$Al$$ have resemblance due to the diagonal relationship, they have nearly equal electronegativity, small size and availability of only four orbitals in the valence shell. They both form amphoteric oxides and dimeric halides.
Question 8
1 / -0

The given property of Be and Al is similar due to diagonal relationship :

A
electronegativity

B
electropositivity

C
ionisation energy

D
none of these

Solution

Option $$(A)$$ is correct.
Due to diagonal relationship $$Be$$ and $$Al$$ have same value of electronegativity.
Both have almost same size and thus favour for covalent bonding, forms covalent compounds having low melting point and soluble in organic solvent.
Question 9
1 / -0

Due to diagonal relationship between $$Be$$ and $$Al$$:

A
both are metals

B
both are metalloids

C
both form polymeric covalent hydrides

D
none of these

Solution

Option $$(C)$$ is correct.
Due to diagonal relationship between $$Be$$ and $$Al$$, both form polymeric covalent hydrides.
Question 10
1 / -0

Melting and boiling point is highest of:

A
$$Be$$

B
$$Mg$$

C
$$Ca$$

D
$$Sr$$

Solution

MP and BP are highest of $$Be$$ despite it are lightest of all the alkaline earth metals.

As we go down the group melting point decreases, but for boiling point metals do not follow a consistent pattern.

Option $$(A)$$ is correct.

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Re-Attempt Weekly Quiz Competition

The s-Block Elements Test 15

Result

The s-Block Elements Test 15

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SHARING IS CARING

Question 1

$$BaCl_2$$

$$NaCl$$

$$CaCl_2$$

$$BeCl_2$$

Solution

Question 2

$$B$$

$$Mg$$

$$Al$$

$$Ga$$

Solution

Question 3

$$Be^{+2} > Al^{+2}$$

$$Be^{+2} < Al^{+2}$$

$$Be^{+2} > > Al^{+2}$$

$$Be^{+2} = Al^{+2}$$

Solution

Question 4

The carbonates of both the metals are unstable

Salt of both do not impart color to the flame

Both combine with nitrogen when strongly heated in an atmosphere

All of these

Solution

Question 5

Oxide of both are amphoteric in nature

Oxides of both are non-volatile and hard

Hydroxides are amphoteric in nature

Both are metals

Solution

Question 6

both belongs to the same group

both belongs to same period

digonal relationship

none of these

Solution

Question 7

have nearly equal electronegativity

form amphoteric oxides

both form dimeric halides

all of the above

Solution

Question 8

electronegativity

electropositivity

ionisation energy

none of these

Solution

Question 9

both are metals

both are metalloids

both form polymeric covalent hydrides

none of these

Solution

Question 10

$$Be$$

$$Mg$$

$$Ca$$

$$Sr$$

Solution

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